Tektronix 708 Instruction Manual

Download

Model 708

Switching System

Instruction Manual

Contains Operating and Servicing information

WARRANTY

Keithley Instruments, Inc. warrants this product to bc free from defects in material and workmanship for a period of I year from date of shipment.

Keithley Instruments, Inc. warrants the following items for 90 days from the date of shipment: probes, cables, rechargeable batteries, diskcttcs, and documentation.

During the warranty period, we will, at our option, either repair or replace any product that proves to be defwtivc.

To cxercisc this warranty, write or call your local Kcithley representative, or contact Keithley headquarters in Cleveland, Ohio. You will be given prompt assistance and return instructions. Send the product, transportation prepaid, to the indicated service facility. Repairs will bc made and the product returned, transportation prepaid. Repaired or replaced products xc warranted for the balance of the originel warranty period, or at least 90 days.

LIMITATION OF WARRANTY

This warranty dots not apply to defects resulting from product modification without Kcithley’s express written consent, or misuse of any product or part. This warranty also does not apply to fuses, software, non-rcchargcablc batteries, damage from batcry lc&agc, 0~ problems arising from normal wear or failure to follow instructions.

THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCI.UDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. THE REMEDIES PROVIDED HEREIN ARE BUYER’S SOLE AND EXCLUSIVE REMEDIES.

NEITHER KEITHLEY INSTRUMENTS, INC. NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRUMENTS AND SOFTWARE EVEN IF KEITHLEY INSTRUMENTS, INC., HAS BEEN ADVISED IN ADVANCE OF THE POSSIBILITY OF SUCH DAMAGES. SUCH EXCLUDED DAMAGES SHALL INCLUDE, BUT ARE NOT LIMITED TO: COSTS OF REMOVAL AND INSTALLATION, LOSSES SUSTAINED AS THE RESULT OF INJURY TO ANY PERSON, OR DAMAGE TO PROPERTY.

Keithley Instruments, Inc. - 28775 Aurora Road-Cleveland, OH 44139 - 216-248-0400 - Fax: 216-248-6168 - http://www.keithley.com

Model 708 Switching System

Instruction Manual

01996, Keithley Instruments, Inc.

Cleveland, Ohio, U.S.A.

Second Printing. lunc 1997

Document Number: 708-90-01 Rev. R

Manual Print History

The print history shown below lists the printing dates of all Revisions and Addenda created for this manual. The Revision Level letter increases alphabetically as the manual undergoes subsequent updates. Addenda, which are relcascd between Revisions, contain important change information that the user should incorporate immediately into the manual. Addenda arc numbered sequentially. When a new Revision is created, all Addenda associated with the previous Revision of lhc manual are incorporated into the new Revision of the manual. Each new Revision includes a revised copy of this print history page.

Kcvisim

Addendutn A (Dncument Number X18-901 -02) *ddc”dum A ~““cument Number 708~901-03~. RWiSi”” B (Ihcumcnt Nunlhcr 7”%9”1~“1).

A (Document Namhcr 708-901-01). ................................................................................... Pcbruary

....................................................................................... Mily ,996

....................................................................................... July 1Wh

.......................................................................................... JU”C ,997

14%

Safety Precautions

The following safety precautions should he obsaved before using this product and any associated instrumcnlation. Although some instruments and accessories would normally be used with non-bazardous voltages, there arc situations where huardous conditions may bc present.

This product is intended for USC by qualified personnel who rccognirc shock hazards and are familiar with the safety precautions required to avoid possihlc injury. Read Lbc operating information cardully before using the product.

The types of product users are: Responsible body is the individual or group responsible for the USC

and maintenance of equipmcnt. and for ensuring that operators are adequately trained.

Operators use tbc product for its intended function. They most hc

trained in electrical safety procedures and proper use of the inntrument. They must bc protected from electric shock and contacl with hazardous live circuils.

Maintenance personnel perform routine procedures on the product to keep it operating, for example. setting tic line voltage or rcplacing consumable materials. Maintenance procedures are described in the manual. The procedures explicitly state if tbc operator may pw form them Otherwise, they should be pcrformed only by service p~IS”“d

Service personnel are trained to work on tivc circuits, and perform

saie installations and repairs of products. Only properly trained ser-

vice personnel may perform installation and service procedures.

Exercise cxtrome caution when a shock hazard is present. Lethal

voltage may be present on cable connector jacks or test fixtures. The American National Standards Institute (ANSI) states that a shock hazard exists when voltage levels greater than 30V RMS, 42.4V peak, or 60VDC are present. A good safety practice is to Expect that hazardous voltage is present in any unknown circuit beSore measuring.

Users OS his product must be pro,ecwtt from elcclric shock ia illI times. The responsible body must c~wrc dun oscr\ xc prcvcwxt access and/or insutaled from every conneclion point. In some CIISLIS. connections most bc cxposcd 10 polenlial buman COIIIWI. Product users in these circunx~mccs must he trained to protect thcmsclvcs from the risk ofelecLTic shock. If Ihc circuit is capable ofopcmling al or above 1000 voids, no conductive part of the circuit may be exposed.

Do not connect switching cards dircclty 10 unbmilcd power circuils. They arc intended LO be used with impcdancc limilctl sourcc~. NEVER connect switching cards directly to AC mains. When connccting sources to switching cards. install prolectivc dcviccr 1o tiw it fault currcn, and votragc to the card.

Bcforc operating an inswument, make sure lbc lint cord is connccl~ cd to a properly grounded power reccpt;~lc. Inspect the connecting cables, test leads, and jumpers for possible wear. cracks. or breaks

before each use.

For maximum safety. do no, louch ,bc product, tcs, abler. or any other instruments white power is appticd to the circuil under test. ALWAYS remove power from the entire test syswm and discharge any capecitars before: connecting or disconnccdng cabtcs or jumpers, installing or removing switching cards. or making internal changes, such as installing or removing jumpers.

Do not touch any object that could provide a currcn~ petit to tbc common side of tbc circuit under wrl or power line (earth) ground.

Always make m~~surcments with dry hands while standing on a dry, insulated surface capahtc of withslanding the voltapc hciny measured.

Do not exceed the maximum signal levels of the inslrumcnt~ and acccssories, as delined in the specilications and operating information, and as shown on the instrumenl or at tixtorc pan&, or switching card.

When fuses are used in a product, replace with same type and rating lor continued proteclion agains, lirc hazard.

Chassis connecLions must only be used as shield connections lo1 measuring circuils, NOT as safely cart,, ground connections.

If you ax using a test fixture, keep the lid closed while powcr is applied to the device under test. Safe operation requires the use of a lid intcll”ck.

Ifa @ ” LL~CW is prcscnt, connect it to safely earl,, ground using the wire recommended in Ihe user documentation.

The A ! symbol on an instrument indicates Ihat the user should rcfcr t” the upcrating instructions located in the manual.

Then

symbol on an instrument shows Iha, it can source or me& sure 1000 dolts or more. including the combincd effect of normal and commrln mode ““Itages. “se standard safety precautions LO avoid personal contact with thcsc voltages.

The WARNING heading in a manual explains dangers that might result in personal injury or death. Always read Lhe associated information wry carefully before performing the indicated procedure.

Instrumentation and a~~~~sories shall not be connected LO humans.

Beiore performing any maintenance, disconnecl Lhc lint cord and all test cables.

TII maintain protection from electric shock and fire, rcplaccmcnt components in mains circuits, including the power ~ransCormer, lest Icads, and input jacks, must be purchased from Keithley lnstrummts. Standard fuses, wilh applicable national safely approvals, may hc used if the rating and type are the same. Other components that are not salety related may be purchased from other suppliers as long as they are equivalent to the original component. (Note that selcclcd parts should bc purchased only through Keithley instruments to maintain accuracy and funclionalily of the product.) If you am unsure about the applicability of a replacement componen,, call II Keithley Instruments oftice for informalion.

To clean the instrument, USC a damp cloth or mild, water based cleaner. Clean the exterior or Lhe insLIumcnt only. Do not apply cleaner directly to the instnun~nl or allow liquids to enter or spill on the inslrument.

The CAUTION heading in a manual explains hands tia~ could damage the instrument. Such damage may invalidate the warranty.

Specifications

Table of Contents

1.1

1.2

1.3

1.4

1.5

1.6

1.7

1.7.1

1.7.2

1.X

1.9

General information

Introduction.. ........................................................................................................................................................ I I

Features ................................................................................................................................................................ I I

Warranty information Manual addenda

Safety symbols and tams I .................................................................................................................................... I

Specifications ....................................................................................................................................................... I-2

Unpacking and inspection.. .................................................................................................................................. I-?

Inspection ror damage

Shipment contents

Repacking for shipment ....................................................................................................................................... I-2

Optional acCeSSorieS.. ........................................................................................................................................... I-2

...................................................................................................................................................

2 Card Installation

2.1

2.2

2.3

3.1

3.2

3.2.1

3.2.2

3.2.3

3.2.4

3.3

3.4

3.4.1

3.4.2

3.4.3

3.4.4

3.4.5

3.5

3.5.1

3.5.2

3.5.3

3.5.4

3.5.5

Introduction ..........................................................................................................................................................

Changing card installation access

.....................................................................................................................................

Card ~nstallatlonlremoval..

Getting Started

Introduction.. ........................................................................................................................................................ 3. I

Front panel famdmnzatlon.. ..................................................................................................................................... 3 -I

LED matrix ................................................................................................................................................

Light pen connection.. ................................................................................................................................ 3-3

LED indicators ........................................................................................................................................... 3-3

Switches/connections.. ...............................................................................................................................

Rear panel familiarization.. ..................................................................................................................................

Card connections.. ................................................................................................................................................ 3-6

Overview - matrix design considerations ................................................................................................

Connections - mstruments to rows

ConnectIons - mstmments to columns ....................................................................................................

Connections -partial matrix expansion ................................................................................................... 3-X

Multiple application cards .......................................................................................................................... 3-8

Expandmg matrix SIX.. ......................................................................................................................................

Overview ~ multiple matrix expansion..

Backplane row expansion ........................................................................................................................ 3- I4

External expansion ................................................................................................................................... 3- 14

Control expansion using master/slave configuration ...............................................................................

System expansion issues. .........................................................................................................................

...........................................................................................................................................

................................................................................................................................

......................................................................................................................................

....................................................................................................................... .2-l

.........................................................................................................

...............................................................................................

I -I I I

I-2 I-2

2-l 2-2

3-2

3-3 3-4

3-h

.3-6

3-X

3.10

.3 IO

3- I.5

3.18

3.5.6

3.5.7

35.8

3.6

3.6.1

3.6.2

3.6.3

3.6.4

Documenting system configuration Analog backplane cable construction. Sample expanded matrices

Bask? watching overview

Power-up.. Selecting make/break and break/make rows Modifying a relay setup Storing relay setup and applying setup to relays

................................................................................................................................................

......................................................................................................................

..................................................................................................................................

...........................................................................................................................

.........................................................................................................

.....................................................................................................

............................................................................................

.....................................................................................

3.18

3.20

3.24 3-24

3.24

4.1

4.2

4.3

4.3. I

4.3.2

4.3.3

4.3.4

4.3.5

4.4

4.4.1

4.4.2

4.4.3

4.4.4

4.5

4.5. I

4.52

4.6

4.6. I

4.6.2

4.6.3

4.6.4

4.6.5

4.6.6

4.6.7

4.6.8

4.7

4.7.1

4.7.2

4.8

4.x.1

4.X.2

4.8.3

4.8.4

4.8.S

4.9

Operation

Introduction.. Setup date paths..

Power-up procedure..

Display.. ...............................................................................................................................................................

Crosspoint display

Operation control

Selecting switching parameters .........................................................................................................................

Triggering ..........................................................................................................................................................

External trigger input Matrix ready output IEEE-48X bus triggering

Reset

..................................................................................................................................................................

........................................................................................................................................................

.................................................................................................................................................

...........................................................................................................................................

Line power connections Power switch.. Power-up self-test and error condltlons.. Power-up c”nCigurati”n

Master/slave power-up ...............................................................................................................................

Error LED IEEE-4X8 statns indicators

Crosspoint display LEDs ...........................................................................................................................

Light pen Modifying..

Copying ......................................................................................................................................................

Digital I/O ports.. External Matrix ready “utput Stand-alonc IEEE-488 Hardware relay

Self-test.. ..................................................................................................................................................

Factory delaults .......................................................................................................................................

Programmed Make/break

Sources.. ...................................................................................................................................................

Overnm

............................................................................................................................................

..................................................................................................................................................

....................................................................................................................................................

...............................................................................................................................................

................................................................................................................................................

.................................................................................................................................................

trigger.. ........................................................................................................................................

and master/slave

bus address.. ............................................................................................................................

settling times ..................................................................................................................

settling times ......................................................................................................................

and break/make rows ...........................................................................................................

conditions

.............................................................................................................................

.....................................................................................................

.............................................................................................................................

........................................................................................................................

.......................................................................................................................................

...................................................................................................................................

....................................

..................................................................................................................................

...............................................................................................................................

.................................................................................................................................

..........................................................................................................................

. ...............................................................................

4 -I 4-l 4-2 4-2 4-2 4-2 4-3 4-3

4.4 4-4 4-4 4-S 4-S 4-6 4-6 4-h 4-7 4-7 4-X 4-X 4-9

4.10

4.10 4-l I 4-l I 4 -I I 4-12

4.12

4.14

4.15

5.1

5.2

5.3

IEEE-488 Programming

Introduction ..........................................................................................................................................................

IEEE-488 quick

Bus cable connections ..........................................................................................................................................

start.. ..........................................................................................................................................

5-l 5-l

5.3

5.4

5.5

5.6

5.7

5.7. I

5.7.2

5.7.3

5.7.4

5.8

5.8. I

5.8.2

5.8.3

5.8.4

5.8.5

5.8.6

5.x.7

5.X.X

5.x.9

5.9

5.9.1

5.9.2

5.9.3

5.9.4

5.9.5

5.9.6

5.9.7

5.9.8

5.9.9

5.9.10

5.9.11

5.9.12

5.9.13

5.9.14

5.9. IS

59.16

5.9.17

5.9.18

5.9.19 S.9.20

5.9.21

5.9.22

5.9.23

5.9.24

5.9.25

5.9.26

5.10

5.1 I

Interface function codes

Primary address programming.. ...........................................................................................................................

QuickBASIC programming .................................................................................................................................

Indicator and c”ntrol aspects “f IEEE-488

Error LED ..................................................................................................................................................

Stetus indicators .........................................................................................................................................

I,OCAL/DIGITAL I/O key..

Concurrent front panel and bus operation

Gcncral bus command pmgramming

Ovcrvicw.. ..................................................................................................................................................

REN (remote enable) .................................................................................................................................

IFC (intcrfacc clear) .................................................................................................................................

LLO (local lockout)

GTL, (go t” local) .....................................................................................................................................

DCL (dcvicc clear). ..................................................................................................................................

SDC (selective dcvicc clear) GET (group execute trigger)

SPE, SPD (serial polling)

Device-depcndcnt command (DDC)

-0vcrvicw ..................................................................................................................................................

A . External trigger ................................................................................................................................

B - Matrix ready ....................................................................................................................................

c - Close crosspoint ..............................................................................................................................

D - Digital Output E-Edit pointer.. F - Enable/disable triggers.. G - Data l’ormat I -Insert blank setup.. J -Self-test..

K . EOI and hold-off.. ...........................................................................................................................

L - Download setups M - SRQ and serial poll byte N ~ Open crosspoint.. 0 - Digital output P - Clear crosspoints

Q - Delete setup

R -Restore defaults

S - Programmed settling time.. T - Trigger

u . status..

V - Make/Break

W -Break/Make..

X - Exccutc

Y - Terminator..

z - copy setup

Relay command combinations

Timing conslderatmns ........................................................................................................................................

.......................................................................................................................................

“pcration ..........................................................................................

......................................................................................................................

..................................................................................................

...................................................................................................................

.................................................................................................................................

.................................................................................................................... 5~ IO

...................................................................................................................

.........................................................................................................................

programming.. .........................................................................................

..................................................................................................................................

....................................................................................................................................

...................................................................................................................

......................................................................................................................................

............................................................................................................................

...........................................................................................................................................

..............................................................................................................................

................................................................................................................. S-26

.............................................................................................................................

..................................................................................................................................

..............................................................................................................................

.....................................................................................................................................

...............................................................................................................................

.............................................................................................................. S-30

.............................................................................................................................................

..............................................................................................................................................

.....................................................................................................................................

..................................................................................................................................

.............................................................................................................................................

.....................................................................................................................................

.......................................................................................................................................

...........................................................................................................................

5-S 5-S 5-6 S-7 s-7 S-X S-9 S-LJ S-<J S-9

5.‘)

S-IO S-10 5 -10 s-10

.S~ IO

5~ 10 S-I I 5-l I

5.15 S- I6 5 -I 7

S-17

S-IX 5 I8

5 I9

S-24

5-24

S-24

S-25

S-28

S-29

S-30

S-3 I

5-32 S-36

S-37 5-38

S-38 s-39

S-40 s-41

6.1

6.2

6.3

Principles of Operation

Introduction..

Overview ..............................................................................................................................................................

Microcomputer .....................................................................................................................................................

........................................................................................................................................................

h-l 6-l 6-2

6.3. I

6.3.2

6.3.3

6.4

6.4.1

6.4.2

6.5

6.5. I h.S.2

65.3

6.5.4

6.6

6.7

6.7.1

6.7.2

6.8

6.9

6.10

.................................................................................................................................................

Reset c,rcu,t Address decoding

Memory ......................................................................................................................................................

Relay control c,rcu,try .........................................................................................................................................

Switching card interface ............................................................................................................................

Switching card logic ..................................................................................................................................

Display crcutry

Display data .............................................................................................................................................

Front pilncl keys .......................................................................................................................................

Display interface ...........................................................................................................................

Refresh display/read keyboard ................................................................................................................

Light pen interface.. ...........................................................................................................................................

Master/slave arcutry

Serial cOmmu”lcat*“” ..............................................................................................................................

Control signals .........................................................................................................................................

Digital I/O ..........................................................................................................................................................

IEEE-48X bus interface.. ....................................................................................................................................

Power supplies.. .................................................................................................................................................

.......................................................................................................................................

..................................................................................................................................................

........... 6-l I

........................................................................................................................................

6-3 6-3 6-3 6-4

6-4 6-6

6-8 6-l I 6-11

6 -I I 6-12 6-13 h-13

h- I4 6 I4

6.14

7.1

7.2

7.3

7.4

7.5

7.6

7.7

7.8

7.9

7.9. I

7.9.2

7.9.3

7.9.4

7.9.5

7.9.6

7.10

8.1

8.2

8.3

8.4

8.5

Maintenance

Introduction.. ........................................................................................................................................................

Fixed rack mstallatmn.

Cover removal .....................................................................................................................................................

Fuse replaccmcnt .................................................................................................................................................

Battery replacement Digital I/O power selection (jumper W 101)

Disassembly .........................................................................................................................................................

Static sensitive devices ........................................................................................................................................

Switching System troubleshooting ....................................................................................................................

Handling and cleaning .......................................................................................................................................

........................................................................................................................................... 7-l

.............................................................................................................................................

........................................................................................................ 7-7

............................................................

Recommended tat equipment.. Power-up selGtest

Power supply checks ................................................................................................................................

Mother board checks ................................................................................................................................

Display checks.. .......................................................................................................................................

Using an extender card ............................................................................................................................

....................................................................................................................................

..................................................

7-l 7-4

7-S 7-h

7-X

7-8 7-10 7 IO 7 -10 7-l I

7.11 7- I5 7 I5 7 I5

Replaceable Parts

Introduction ..........................................................................................................................................................

Parts lists Ordering information

Factory service .....................................................................................................................................................

Component layouts and schematics

..............................................................................................................................................................

...........................................................................................................................................

.....................................................................................................................

8-l 8-l

8 -I

A Card Configuration Worksheet

B.I

8.2

I/O Connections

Typical output connection schemes ,.,,..,.......................,.......................,.....................,,,...................................... B-l

Typical input connection scheme ,,,,,.,..,............................................,.........................,,...................................... B-2

C.I c.2 C.3 c.3.1 C.3.2 c.3.3 c.4 c.4. I C.4.2 c.4.3 c.4.4 c.4.5 C.4.6 c.4.7 C.4.8 C.5

IEEE-488 Bus Overview

Introduclion..

Bus description.. ..................................................................................................................................................

Bus lines

Data lines.. .................................................................................................................................................

Bus management lines ..............................................................................................................................

Handshake lines

Bus commands.. ..................................................................................................................................................

Unilinc commands ....................................................................................................................................

Universal mulLilinc commands

Intcrhcc Cunction codes ......................................................................................................................................

.......................................................................................................................................................

..............................................................................................................................................................

........................................................................................................................................

.................................................................................................................

commands..

...................................................................................................................................

..............................................................................................................

C-I C-I c-3

C-3 C-3 (‘~3 C4 C-J C-5

C-R

”

List of Illustrations

Figure 2-l Figure 2-2

Figure 3-l Figure 3-2 Figure 3-3 Figure 3-4 Figure 3-5 Figure 3-6 Figure 3-7 Figure 3-8 Figure 3-9 Figure 3.10 Figure 3-l I

Figure 3. I2 Figure 3-I 3 Figure 3-14 Figure 3-15 Figure 3.16 Figure 3- 17 Figure 3. I8

Card Installation

Model 708 switching system - changing switch card installation ,.............................................................. 2-2

Matrix card installalion .._................................................................................................................... _

T-3

Getting Started

Model 708 front panel switches.. ................................................................................................................

Setup data transfers ......................................................................................................................................

Digital 110 status display.. ............................................................................................................................

Front panel ...................................................................................................................................................

Model 708 rear panel ...................................................................................................................................

Connecting instruments to rows - single switching system Connecting instruments to rows - multiple (two) switching systems

Connecting instruments t” columns - multiple (two) switching systems..

Partial matrix expansion example.. ...........................................................................................................

Sample backplane expansion ....................................................................................................................

Sample cxtcmal (I” backplane) expansion

Sample of master/slave interconnect cables

Mastcdslave column locations..

Analog backplane expansion connectors

Backplane expansion cable - five Model switching systems External row expansion two stand-alone Model 708’s.. Sample backplane expansion Partial matrix expansion example

................................................................................................................. 3 I7

..................................................................................................................... 3-23

..............................................................................................................

.................................................................................................

five Model 708 switching systems..

...................................................................................................

........................................................................ 3.7

.........................................................

.................................................. 3~Y

..................................

....................................................................

......................................................................... 3-22

.3-l

3-2 3-2 3-4 3-5

3-7

.3 IO .3 -1 I

3-12 3 I6

3-20 3-21

3-24

Figure 4. I Figure 4-2 Figure 4-3

Figure 4-4 Figure 4-S Figure 4-6 Figure 4-7 Figure 4-8

Figure 4-9 Figure 4. IO Figure 4-11

Figure 4- I2

Figure 4-13

Figure 4. I4

Figure 4-15

Operation

Paths for relay setup data .............................................................................................................................

IEEE-488 status indicators.. Crosspoint display LEDs Light pen Pinouts 1nputl0utput conr,gurat1ons

Rear panel BNC jacks ..................................................................................................................................

Sample cxtemal trigger pulses Sample matrix ready pulses Master/sIavc connectors Rear panel IEEE-488 address switches IEEE-488 bus connector and rotary selection switches Timing without make/break Timing with either makclbrcak or break/make rows Timing with both make/break and break/make rows

...................................................................................................................................................... 4-6

dtgltel I/O ports ............................................................................................................................

.........................................................................................................................

..........................................................................................................................

.....................................................................................................................

.........................................................................................................................

............................................................................................................................

.....................................................................................................

............................................................................. 4-10

and break/make rows..

.................................................................................

................................................................................. 4- 14

4 -I 4-4

...4-5

4-7

4.7 4-8 4-8

4-x

...4- 9

4-Y

.4-12

4-13

vii

Figure 5. I

Figure S-2 Figure S-3 Figure 5-4 Figure 5-5 t’igurc 5-6 Figure 5-7 Figure s-x Figurc 5-9 Figure 5. IO Figurc 5-11 Figurc 5-12 Figurc 5. I3 Figure S- I4 Figure 5. IS Figurc S- I6 Figurc 5-17 Figure 5-18

Figure 5-19 Figure S-20 Figure S-21 Figure 5-22 Figure 5-23

IEEE-488 Programming

Flowchart ol’cxamplc program IEEE-488 connector.. IEEE-48X connections IEEE-488 connector location

Contacl assignments ....................................................................................................................................

IEEE-488 bus connector and rotary sclcction

IEEE-488 indicllrors .....................................................................................................................................

Digital I/O status display mode External trigger pulse.. Matrix reedy pulse GO and Cl full output formats.. G2 and G3 inspect output Cormats

G4 and G5 condensed output formats

and G7 binary output formats SRQ mask and serial poll byte format.. KEADY and MATRIX READY signal timing

UO machine status word

Ul error status word ..................................................................................................................................

U3 relay step pointer ..................................................................................................................................

U4 number ot” slaves ..................................................................................................................................

U5 card idcn(lfxatmn ...................................................................................................................................

U6 relay setthng tmx.. ................................................................................................................................

U7 digital input ..........................................................................................................................................

...................................................................................................................................

.................................................................................................................................

...............................................................................................................................

.....................................................................................................................................

....................................................................................................................

........................................................................................................................

switchcs..

....................................................................................................................

.................................................................................................................

.............................................................................................................

....................................................................................................... 5-22

..............................................................................................................

.....................................................................................................

......................................................................................... 5-3 I

.............................................................................................................................

............................................................................. S-6

5-2 5-3

S-3

5-4

5-8

5-9

5 I5

S- I6

S-21 S-22

S-23 S-26

5-33

5-34 5-35

5-35

5-3s

5-36

Figure 6. I Figurc 6-2 Figure 6-3 Figure 6-4 Figure 6-S Figure 6-6 Figure 6-7

Figure 6-X Figure 6-9 IFigure 6-10 Figure 6. I I

Figure 6. I2

Figure 7. I

Figure 7-2

Figure 7-3

Figure 7-4

Figure 7-5

Figure 7-6

Figure 7-7

Figure 7-8

Figure 7-9

Principles of Operation

Model 708 block diagram ............................................................................................................................

Digital board block diagram.. ......................................................................................................................

RAM and battery backup .............................................................................................................................

Matrix card interface simplified schematic

Matrix card interlaw timing diagram.. Typical matrix card logic block diagram

IDDATA timing diagram ............................................................................................................................

Display board block diagram .......................................................................................................................

Display interface simplified schematic

Light pen interface simph~xd schematic

Master/slave interface simphfied schematic

Digital l/O interlace simplified schematic

.................................................................................................

........................................................................................................ 6-6

.....................................................................................................

........................................................................................................

...................................................................................................

..............................................................................................

.................................................................................................

6 -I 6-2 6-4

6-S 6-7

6-7 6-9 6-9

6.12

6- I3 6 I5

Maintenance

............................................................................................................................................ 7-2

Rack mstalla~~on

Screw and dress panel removal

Fuse FAA250 location..

Shield removal .............................................................................................................................................

W 101 jumper location .................................................................................................................................

Model 708 exploded view

Troubleshooting programs. ........................................................................................................................

Relay control wavcCorms

Display interface waveforms .....................................................................................................................

..................................................................................................................................

....................................................................................................................

...........................................................................................................................

........................................................................................................................... 7-14

7-4 7-5 7-6 7-7 l-9

7 -IO 7 I4

Figure B-I Figure B-2 Figure B-3 Figure B-4 Figure B-5

I/O Connections

Digital output, solenoid control Digital output, r&y control Digital output, motor control Digital output, logic dcvicc Digital input,

....

momtonng micro-swtchcs

........................................................................................................................

...................................................................................................................... B-2

control.. ...........................................................................................................

..................................................................................................................

...................................................................................................

IS- I IS- I

B-2 B-2

Figure C-l Figure C-2 Figure C-3

IEEE-488 Bus Overview

IEEE-488 bus configuration. IEEE-48X handshake sequcncc Command codes..

........................................................................................................................................

.......................................................................................................................

C~?

...................................................................................................................

C3 C-6

List of Tables

Table 3-l Table 3-2 Table 3-3 Table 3-4 Table 3-S Table 3-6 Table 3-7 Table 3-X Table 3-9

Getting Started

Digital input display formats.. Digital output display Ibrmats IEEE-488 address switches. Matrix and multiplexer cards Row-column and column-column paths Matrix expansion.. Model 708 external expansion cables Rcsponsc time comparison Model 708 switching system card configuration worksheet

.......................................................................................................................................

......................................................................................................................

.........................................................................................................................

.......................................................................................................................

......................................................................................................

........................................................................................................

.........................................................................................................................

3-3 3-3 3-5 3-6 3-X

J-13 3 I5 3 IX

......................................................................

3 IY

4 Operation

Table 4. I Setup data paths ...........................................................................................................................................

Table 4-2 Table 4-3 Table 4-4

Table 4-5 Make/break and break/make operation.. ...................................................................................................

Table 5. I Table 5-2

Table 5-3 Table 5-4 Table 5-5 Table S-6 Table 5-7 Table 5-8 Table 5-9 Table 5. IO Table 5-I I Tablc 5.12

Table S-13 Table S-14 Table 5.15

Power-up, reset, and factory defaults Error conditions.. Slave unit controls, indicators, and connections..

........................................................................................................................................

IEEE-488 Programming

Sample strings.. ............................................................................................................................................

Contact assignments .....................................................................................................................................

Model 708 interlace lunclmn codes BASIC IEEE-48X statements IEEE-48X errors causing ERR LED to illuminate Digital input display format.. Digital output display format General bus commands/BASIC statements Factory default, power-up, Order of command execution..

DDC summary ...........................................................................................................................................

Master/slave setup example

Byte counts for data format.. .....................................................................................................................

Typical transnuss~on and hold-off times - stand-alone Typical transmission and hold-off times - master and

.......................................................................................................................

and DCL/SDC conditions..

.......................................................................................................................

...........................................................................................................

........................................................................................

.............................................................................................................

.......................................................................................

.......................................................................................................................

................................................................................................

.............................................................................

...................................................................................................................

..............................................................................

one slave

.............................................................

J- I J-3

..J~J

4-9

.4 -I I

5-2 5-4

S-5 5-6 S-7 5-9 5-Y

5.10 S-I I S-I?

5.13 S-20

.5-21

5-42

.5-43

Principles of Operation

Table 6-I

Display segment assignments ..__.......__..................................,.............................................................. O-IO

7 Maintenance

Table 7. I Table 7-2

Table 7-3 Microcomputer checks Table 7-4 Table 7-5 Table 7-6 Table 7-7 Table 7-8

Table 7-9 Display

Recommended troubleshooting equipment Power supply checks..

control cheeks.. ................................................................................................................................

Relay Display interface checks

Digital I/O checks

Light pen checks. Master/slave checks

hoard checks.. ...............................................................................................................................

................................................................................................................................

...............................................................................................................................

......................................................................................................................................

.......................................................................................................................................

...................................................................................................................................

8 Replaceable Parts

708 mother bead, parts list.. ............................................................................................................

Table S- 1

Table 8-2

Table 8-3

Table X-4

Table 8-5

Model Model 708 front panel control hoard, pats list Model 708 backplane board, parts list Model 708 display hoard, parts list.. Model 70X miscellaneous, parts list

...............................................................................................

............................................................................................................................

...........................................................................................

.........................................................................................................

............................................................................................................

.............................................................................................................

7-10 7-l I 7 -I I 7 I2 7- 12 7- I2 7-13 7- 13 7-15

8-2 8-4 R-4 8-5 8-5

C IEEE-488 Bus Overview

Table C-l

Table C-2

Table C-3

Table C-4

Table C-5

Table C-6

IEEE-48X bus command summary Hexadecimal and decimal command codes.. Typical addressed command sequence Typical addressed command sequence IEEE command Model 708 interface function codes

groups ................................................................................................................................

..............................................................................................................

...............................................................................................

........................................................................................................

............................................................................................................

C-4 C-5 C-7 C-7 C-7 C-X

xii

General Information

1.1

This section contains general information about the Model

708 Switching System. The Model 708 is designed as a programmable switch for connecting signal paths in II matrix topology. It is for applications requiring a small-scale matrix (up to 96 crosspoints per mainhxme and 480 crosspoints per master/slave configuration). Plug-in cards are available for general and special purpose switching applications.

Introduction

1.2 Features

Key features of the Model 708 Switching System are:

The switching system accepts one 7X7X switching card (front or rear panel installation).

Digital I/O contained in the switching system (sixteen inputs and outputs with internal pull-up resistors).

IEEE-488 bus or interactive programming.

Storage of 100 sets of relay setups, which can bc uploaded or downloaded through the IEEE-488 intcrfacc.

An active front panel LED display shows the present relay status, a stored setup, or an editing scratchpad.

High-speed triggering of stored setups. Makc/Lxeak and hrctimake switching programmable

matrix by rows. Operation is transparent and indcpendent of the relay setup.

- Maximum matrix size of 8 rows by 60 columns (480 crosspoints on one IEEE-488 address with live units connected in a mastcrlslave configuration).

- Scaled construction, low heat producing design eliminatcs vent holes, which is suitehlc for cleanrooms.

. An optional light pen is available for interactive control

of relays and editing stored relay setups.

1.3 Warranty information

Warranty information is located on the inside from cow-r ot this manual. Should your Model 70X rcquirc warranty Serb vice, contact your Kcitblcy rcprcscntativc or an iwtborizcd repair facility in your arca for furtbcr information.

1.4 Manual addenda

Any improvements orchangcs concerning the switching system or manual will he explained in ;m addendum 1%~ sure 10

note these changes and incorpomtc them into the manual hcfore using or servicing the unit.

1.5

The following symbols and terms may hc found on an instnimcnt or used in this miuwal.

TheA.

should r&r to the opemting instructions located in the instruction manual.

The A. qymhol on an instrument shows that high voltage

may hc present on the terminal(s). USC standard safety precautions to avoid personal contact with tbcse voltages.

The WARNING heading used in this manual cxplains dagers that might result in personal injury or death. Always read the associated information wry carefully hcforc per-

forming the indicated procedure.

The CAUTION heeding used in this manual explains haz-

ads that could damage the instrument. Such damegc may invalidate the warranty.

Safety symbols and terms

symbol on an instrument indicates that the user

1-I

1.6 Specifications

1.9 Optional accessories

Model 708 specifications axe located at the front of this manual. These spccifcations are exclusive “1 matrix card specifications, which arc located in their appropriate instruction manual.

1.7

1.7.1

Upon receiving the Model 708, carefully unpack the unil and

inspect it for any obvious signs of physical damage. Repon any damage to the shipping agent immcdiatcly. Save the original packing carton for possible future shipment. If installing a matrix card at this time, be sure to follow the additional handling precautions explained in the appropriate matrix card instruction manual.

Unpacking and inspection Inspection for damage

1.7.2 Shipment contents

The following items arc included with every Model 70X order:

* Model 70X Switching System. * Model 708 Instruction Manual. . Fixed rack mount kit (includes mounting hardwax). * Removable feet (for bench-top use - includes hard-

WWS).

* Additional accessories as ordered.

The following accessories are available for the Model 708. Adapter and switching matrix cards

Model 7070 Universal Adapter Card - The Model 7070 card installs in the Model 708 and is jumper-sclcctablc for use cilhcr as a backplane cxtcnder or a breadboard. It has quick-disconnect screw terminals and IOft. ribbon cables.

Model 7071 General Purpose Matrix Card -The Model 7071 card has 8 rows by 12 columns of three-pole Form A

switching for general purpose applications. It has mass term minated connectors in addition to quick-disconnect screw terminals.

Model 7071-4 Dual 4 x 12 General Purpose Matrix Card

-The Model 707 I-4 card has two banks of four signal paths of three-pole switching. Row and column connections to the matrix are through 3X-pin mass terminated connectors.

Model 7072 Semiconductor Matrix Card - The Model 7072 card has 2 rows by 12 columns of two-pole Form A for low cumxt switching, 4 rows by 12 c”lumn~ of two-pole Form A for general purpose switching, and 2 rows by 12 columns of one-pole Form A for C-V switching. IL has three-lug triaxial connectors.

Model 7072-HV High Voltage Matrix Card -The Model

7072.HV switches low level, high vollage, and high impcdante signals for semiconductor parametric tests. It has two low current paths, four general purpose paths, and two C-V paths. Connections to the matrix are through triax connectors.

1.8 Repacking for shipment

Should it become necessary to return the Model 708 for rcpair, carefully pack the unit in its original packing carton or the equivalent, and perform the following:

Call the Repair Department at I-800-552-1 115 for a Repair Authorization (RMA) number.

Advise as to the warranty status of the switching system.

Write ATTENTION REPAIR DEPARTMENT and the RMA number on the shipping label.

Fill out and include the service form located at the back of this manual.

l-2

Model 7073 Coaxial Matrix Card - The Model 7073 card has 8 rows by 12 columns of one-pole FormA switching (up to 30MHz) for applications with single-ended instruments. It has BNC connectors.

Model 7074-D Eight 1 x 12 General Purpose Multiplexer Card - This card has eight banks “I’ one signal path of three-pole switching. Bank connections are through four 75. pin mass tenninatcd connectors; row connections are through one 3X-pin mass terminated connector.

Model 7075 Eight 1 x 12 Two-Pole Multiplexer Card The Model 7075 is a general purpose multiplex switching card that consists of tight banks of independent 1 x 12 mul-

tiplexer switching. Eight 25.pin D connectors are provided

Sor bank connections and one for row connections.

Model 7076 Dual 4 x 12 Two-Pole Matrix Card - The Model 7076 is a general purpose matrix switching card that consists of two indcpcndent 4 x 12 switching matrices. Each matrix has two switched circuits (HI and GUARD). The four row signal paths ‘ax connected through jumpcrs to the general purpose analog backplane in the Model 708. Conncctions to the matrix arc through standard 25.pin D connectors for mass termination.

Model 7077 8 x 12 Isolated Coaxial Matrix Card - The

Model 7077 has 8 rows by 12 columns of two-pole Form A switching for general purpose applications. It has BNC cot)nectars.

Model 7 172 Low Current Matrix Card - The Model 7 172 is for semiconductor I-V and C-V measurements. It is contigurcd in an 8 x 12 matrix of two-pole switching with triax connectors. An on-board elcctromcter measures offset current.

Model 7173-50 4 x 12 High Frequency Matrix Card This card combines high frequency performance with excellent DC switching characteristics. It provides 200MHz bandwidth in a 4x12 matrix configuration. It has BNC COll”eCt”TS.

Model 7174 8 x 12 Low Current Matrix Card- The Model 7 174 is designed for high pcrfommnce switching 01 I-V

and C-V signals. It has triax connccto~‘s.

Miscellaneous cables and accessories Model 7007-l Shielded IEEE-488 Cables - The Model

7007-l connects the Model 708 to the IEEE-48X bus using shielded cables to reduce clcctromagnetic intcrl’crcncc (EMI). The Model 7007-I is Im (3.3ft) long imtl has im IIMI shielded IEEE-48X connector at ci~h end. This cable is also available in a 2111 (6.6ft) length (Model 7007-2).

Model 7051.2 BNC to BNC Cables - The Model 705 I-2

makes connections to cxtcrnal trigger and matrix ready on the Model 708 rear panel. The Model 705 I-2 is ii St)<> BNC to BNC cable (RG58C), which is 0.611~ (2ft) long. This cable

is also available in a ISm (5ft) length (Model 70.51-S).

Model 7078.PEN Programming Light Pen ~ The Model

7078.PEN connects to the Model 70X front pancl. It is used

to toggle the states of the LEDs that display crosspoints and

digital l/O. A pen holdcr is included.

Model 8501-l and 8501-2 Trigger Link Cables - The

Model 8501-l and X501-2 contain nn X-pin malt DIN con-

ncctor. The Model 8501 -I is 1111 (3.311) in Icngth. and the

Model X501-2 is 2111 (6.61() in length. Multiple cahlcs arc

used for connecting Model 708 units in a mastcrlslavc con-

figuration through tbc rear panel mesterlslwc connectors. Now The following backplane expansion component\ xc

availeblc from 3M Corporation.

Digital I/O cables Model 7075-MTC Standard Cable ~ Standard 3m (IOft)

cable assembly terminated with 25.pin D-sub plugs on both ends.

CS-400 Cable - 25.pin D-sub plug that will mate to the reccptacles of the card. Solder-cup connections simplify the building of custom cables.

CS-401 Cable- 25.contact D-sub receptacle that will mate to the cables terminated with a 25-pin D-sub plug.

CS-590 Cable-Plastic backshell housing for CS-400. Note: The following two cables are availahlc from 3M Cor-

poration.

8225-7000 (3M) Cable - 25.pin D-sub plug for customized ribbon cahlc assemblies.

3357.9225 (3M) - Junction shell for 3M X225-7000 D-sub plug.

Backplane expansion (20 pin cable components) 3365/20 (3M) - 2X AWG ribbon cable rated at >2oOVDC. 3461-001 (3M) - 0. I inch card-cdgc connector with a cur-

rent rating of IA z ZOOVDC (one connector required for each Model 708).

3448-54 (3M) - Strain relief.

Backplane expansion (SO pin cable components) 3365/50 (3M) - 28 AWG ribbon cahlc rated at >2OOVDC. 3415-OOOl(3M) - 0. I inch card-edge conncxtor with ii cur-

rent rating of IA > 200VDC (one connector required fol each Model 70X).

3448-54 (3M) - Strain relief.

I-3

2.1

Installation procedures arc described in this section.

Introduction

WARNING

The procedures in this section are intended for use by qualified service personnel only. Do not perform these procedures unless qualified to do so. Failure to recognize and observe normal safety precautions could result in personal injury or death.

2.2 Changing card installation access

The configuration chosen for each Model 708 Switching System (front or rear) can simplify connections and shorten tbc wiring required for each installation. As shipped from the factory, the unit is configured for rear panel card installation. With the Model 708 Switching System configured for front panel card installation, the card and connections can be ac-

ccssed from the front of the rack. Use the following procedure to change the Model 708 conliguration for front or rear panel card installation.

WARNING

Turn off power from all instrumentation (including the Model 708 Switching Sys-

Card

tern) and disconnect all power lint cords. Make sure all power is removed and stored energy in external circuitry is discharged prior to changing card installation configuration.

To prevent contamination, handle matrix cards and backplane using lint-free gloves. If contamination occurs, clean according to the card’s instruction manual.

I. Remove the card. slot cover. and analog backplane from

the Model 708 Switching System by loosening the spring-loaded mounting screws (set Figure 2-l 1.

2. Install analog backplane on the Model 708 Swilching System panel. Make sure the analog backplane c”n”ecm tar (PlOl5) is inserted complclely inlo its mating cow nectar. The mating connector will be J IO1 5A for frond panel card installation and J1015B for rear panel card installation.

* Front panel cud installation ~ Install

the analog backplane on the rca panel of the unit.

* Rear panel card installation - Install

the analog backplane on the front pencl of the unit.

3. Sccurc and ground by tightening the spring-loaded mounting screws.

Installation

CAUTION

2-l

Figure 2-l Model 708 rwitching s.wtem - changing switch card installation

2.3 Card installation/removal

Before operating the Model 708 in a test environment, install

a card in the switching system. Although cards arc not need-

cd to program setups for master/slave configurations, make

sure the loop connections are present. Card installation

Using Figure 2-2 as a guide, install a card in the Model 708 Switching System as follows. Specitic card instructions can be found in the appropriate card’s manual.

WARNING

Before installing or removing cards or making card connections, turn off mainframe power and disconnect the line cord. Also, make sure no power is applied from the user’s circuit.

CAUTION

Do not touch the card surfaces, connectors, or components to avoid contamination that could degrade card performance.

NOTE

Some cards have connectors that are inaccessible once the card is fully inserted into the switching system (e.g., the quick disconnect terminal blocks on Model 7071 cards). In these cases, connect wires to the row and column terminal blocks before scaling the card fully in the backplane connectors.

I. Rcmovc the slot cover (if installed).

2. Using lint-free glows. install the card

2-2

lode, ~“8 Switching Syitcm

~~~~~~ ,,ane, card inrtallatiun)

Figure 2-2

Matrix curd installaiion

,,,,’ ,,

.,, ,,, :~

C’,,;!,: :.‘.‘,’

”

,;’ ,, ,,, ,‘~)

t&mix Card

,,,.

”

,, ,’ ‘~ ‘,~

,, ,;’ ,,’ ,’ ‘>

,,, ,,,‘,’ ,‘.’

,’

,,. ,,,‘,’ ,,,

2-3

CAUTION

Properly support the card until it is fully seated in the Model 708’s analog backplane. If the card is not supported until it is fully seated, it may be damaged by its own weight.

WARNING

Before installing or removing cards or

making card connections, turn off mainframe power and disconnect the line cord. Also, make sure no power is applied from the user’s circuit.

3. Pick up the card with both hands (one hand grasping the handle and the other hand supporting the weight of the card).

4. Align the card in the Model 708. M&c sure the edges of

the card slide into the card edge guides and the component side of the card is facing op.

5. Slide the card into the Model 70X. Make sure the card is

fully seated in lhe analog backplane.

6. Tighten the spring-loaded mounting screws with a Phil-

ips screwdriver.

WARNING

The mounting screws must be secured to ensure a proper chassis ground connection between the card and the Model 708 Switching System. Failure to properly secure this ground connection may result in personal injury or death due to electric shock.

Card removal Using Figure 2-2 as a guide, remove a card from the Model

708 Switching System as Coollows. Specilic card instructions can bc found in the appropriate card’s manual.

CAUTION

Do not touch the card surfaces, connectors, or components to avoid contamination that could degrade card perforlllZi”CC.

NOTE

Some cards have connectors that are inacccssible once the card is fully inserted into the switching systm (e.g., the quick disconnect terminal blocks on Model 7071

cards). In these cases, remove wires from

the row and column terminal blocks be-

fort fully removing the card from the backplane connectors.

I. Using lint-free gloves, remove the card.

* Loosen the spring-loaded mounting screws. * Poll oat the card by its handle (one hand grasping the

handle and the other hand supporting weigh1 of card).

CAUTION

Properly support the card while removing it from the mainframe. An unsupported card may be damaged by its own weight. Store cards properly. Refer to

the appropriate card manual’s handling

and cleaning precautions for specific instructions.

2-4

2. Install the slot cover (or other card as applicable).

3.1

This section contains information on operating the Model

70X. It includes a brief description of operating controls and

connections. Once you are familiar with the malcrial pre-

sentcd hcrc, refer to Section 4 for more dctailcd information.

3.2

An overview of the Model 708 front panel operation is given in the following paragraphs. The front panel switches arc shown in Figure 3. I. The front panel of the Model 708 accepts plug-in matrix cards when contigurcd for front panel matrix card installation (refer to paragraph 2.2). When configured for rear panel matrix card installation, the front panel contains the analog backplane. Figure 3-2 illustrates setup data transfers within the Model 70X.

Introduction

Front panel familiarization

Getting Started

copy

function. When the LED is lit, imy

crosspoint display will be immcdiatcly copied 10 lhc relays.

CAUTION

When changing setups, use caution when the COPY key is enabled (the corresponding LED will be lit). Accidental connections may be copied to the relsys causing instrument damage.

clw~pc~

made

the

All front panel keys except POWER are momentary-contact membrane switches. The COPY key has an LED indicating the

Figure 3-1 Model 708 from ~mnel swirches

Model 7””

rr”nt Panel

Figure 3-2 Setup data transfers

3.2.1 LED

matrix

Use the LED matrix to monitor (or change using the optional light pen) the CROSSPOINT (relay) status or DIGITAL I/O status (see Figure 3-3). The CROSSPOINT display mode is the default mode for the Model 708.

CROSSPOINT - Shows crosspoint status Sor the present relay setup, a stored relay setup, or an edited relay setup. The

LED matrix (8 rows by 12 columns) shows on/off states of

the card setup. States can be changed by the IEEE bus or the optional light pen. Crosspoint configurations can be stored in memory ot’ sent to relays. A closed relay is indicated by a lit LED.

DIG I/O ~ When the Model 708 is placed in digital I/O display mode, the LED matrix shows the present digital IN/

OUT status. The digital IN LEDs are located in rows A-H, columns l-2. The digital OUT LEDs are located in rows AIi, columns I I 12. States can be changed by the IEEE bus or the optional light pen.

Model 7X7X MatrixCards

Figure 3-3 Digital I/O status display

3-2

Input-Displays the present status of the digital inpul on the LED matrix. Logic high is indicated by a lit LED. The digital input display status is continuously updated. Table 3-l lists digital input display formats.

Kow/Column

BI Cl

El Fl

Output-Displays the present status of the digital output on the LED matrix. The output can bc changed by clicking the light pen on the appropriate LED. Output high is indicated by a lit LED. Output low is indicated by an extinguished LED. The digital output display status is updated when the output is changed. Table 3-2 lists digital output display formats.

Input #

I 2 3 4 5 6 7 8

Row/Column

82 c2

Input #

9 I 0 II I2 I3 14 I5 I6

3.2.2 light pen connection

LIGHT PEN -An optional input device for toggling Ihe on/off state of the crosspoint display LEDs and digital I/O LEDs. One Ii&t pen is uxd to control the I.EDs of up to live

Model 708 mainframes. Rcfcr to Figure 3 I for the location

ofthc light pen connection. Refer to pxagraph 4.4.4 for light

pen operating information.

3.2.3 LED indicators

IEEE-488 STATUS INDICATORS

TAI.K, LSTN, REM - Thcsc three I.ED indicators apply

to instrument operation over the IEEE-JXX bus. The TALK and LSTN indicators show when the unit has been addrcsscd to talk or listen. REM turns on to show when the unit is in the IEEE-488 rcmotc state. Set Section 4 for detailed inform;\+ don about operation over the bus.

OTHER STATUS INDICATORS ERR ~ This LED lights when an CITOT conditiun is Ilagged.

The error condition is flagged in the serial poll byte when any bits in the Error Status Word xc set. Refer to paragraph

5.9.20 for inlonnation on sending the Eror Status Word (command Ul).

Table 3-2

Digital olrtput displayfirmats

iow/Column

A12 1312 Cl2 Dl2

El2 F12

Gl2

HI2

3utput #

9 IO II I2 13 I4 I5 I6

COPY- When this LED is lit, any change to the crosspoint display is immediately sent LO the rcleys. Rcfcr to paragraph

3.2.4 for information on toggling the COPY LED.

3.2.4 Switches/connections

POWER -The power switch turns the unit on or off. The unit is on when the POWER pushbutton is in (depressed) and off when the POWER pushbutton is out.

CAUTION

The position ofthe POWER pushbutton indicates the power status of the Model 708 Switching System. The status of the crosspoint display and the other LEDs are not indications of power being ap-

plied to the Model 708.

R-3

LOCAL and DIG I/O-This key places the Model 708 in

local (while in remote) or in digital I/O mode (while in local). While in digital l/O mode, I/O status will appear on the LED matrix (see Figure 3-3).

LOCAL- With the Model 70X in remote, pressing LOCAL returns the switching system to local mode (REMOTE off). While in local, operation of all front panel controls are active unless the Model 708 is in LLO (local lockout). For more information about local lockout, refer to paragraph 5.8.4.

OPEN RELAYS ~ Turns off (opens) all prcscnt crosspoint LEDs (if not in digital l/O display mode). COPY must be enabled to open relays automatically.

COPY DISPLAY-RELAYS - Enables/disables automatic copying of the displayed crosspoint configuration to the 1%.

lays. This causes any change to the crosspoint display to be applied immediately to the relays. This pushbutton also toggles the COPY LED (see paragraph 3.2.3) on and off.

DIG I/O-With the Model 708 in local, press this key to select digital I/O display mode (set Figure 3-3). Press this key a second time to return to local mode from digital I/O display mode. Refer to paragraph 3.2. I for information on digital II0 display format.

RESET ~ Performs the same functions as cycling power (all relays arc opened, triggers are disabled, RELAY STEP to 000, MEMORY STEP to 001, etc.) with the exception of power-up self-checking and master/slave loop initialization.

3.3 Rear panel familiarization

The following paragraphs contain an ovcrview of the Model 708 Switching System rear panel (set Figure 3-5). In addition to the various connectors, IEEE-488 address selection switches arc located on the rear panel. Masterlslavc configuration and IEEE-488 (GPIB) addresses arc set using these rotary selection switches. The rear panel of the Model 708 accepts plug-in cards when configured for ear panel card installation (see paragraph 2.2). When not conligured for rear panel card installation, the rear panel contains the analog backplane.

3-4

EXT TRIGGER INPUT - A BNC jack for applying a trigger pulse to chengc to the next relay setup, if triggers xc cnablcd and TRIG ON EXT is selected as the source. Pulses must be TTL-compatible, negative or positivc-going (programmablc edge). with a duration grcatcr than 60011s. Rcfcr to the external trigger device-dependent command (DDC) in paragraph 5.9.2.

MATRIX READY OUTPUT -A BNC jack providing LL ‘ITL-compatible, high- or low-true level. It goes false when relays arc switched and goes true after the sum of the relay

settling time and the programmed settling time. Refer to the matrix ready device-dcpendcnt command (DDC) in pagraph 5.9.3.

MASTER/SLAVE OUT - An X-pin DIN conncClor for connecting a cable to the next switching system in a master/

slave daisy-chain configuration.

MASTER/SLAVE IN -An g-pin DIN connector for con-

necting a cable from the previous switching system in a mas-

ter/slave daisy-chain conliguration.

DIGITAL I/O ~ Two DB-25 connectors.

Ilyback diodes. Pull-up volt;~gc is 5V at 6SmA maximum. Extcmal connections are provided for user supplied voltage (4OV maximum). Maximum sink current is 600mA per channel. Output short-circuit pmtcctwn IS provided up to 2SVDC.

Refer to paragraph 4.6. I for more information on the digital I/O ports.

IEEE-488 INTERFACE - This connector interlhccs the Model 708 to the IEEE-488 bus. Refer to paragraph 4.6.5 lot more information on the IEIZ488 intcrfxx port.

IEEE-488 ADDRESS SWITCHES -Two rotary \witcI~cs set GPIB (IEEE-488) addresses and also designate IIIBSLCT/ slave units. From the lectory, thcsc switches are set to a GPIB address of IX. Valid switch settings arc shown in Table 3-3. Rcfcr to paragraph 4.6.5 for more information on the

IEEE-488 interfaacc port

Input - Sixteen inputs with internal pull-up r&stars provide lcvcl shifting for direct micro-switch monitoring. Maximum voltage is 42V (peak).

Output - Sixteen open collector drivers with factoryinstalled IOkn pull-up resistors. Each driver has intcmal

AC RECEPTACLE - Power is applied through the supplied power cord to the three-terminal AC rcccptaclc.

3-s

Getting Started

3.4 Card connections

3.4.1 Overview-matrix design considerations

Card connections provide connection terminals between the instruments and the DUTs. For each matrix card designed for the Model 70% the rows can bc lengthened by adding col-

umns from other cards of the same model number through the analog backplane busts or with user-installed jumpers, depending on the card model. To manufacture a cable for an-

alog backplane bus expansion, refer to paragraph 3.5.7.

Rows arc expanded across mainframe boundaries, either in a

master/slave or stand-alone/stand-alone configuration. In a

mastcr/slavc configuration ol’ up to five switching systems, the rows arc extended to 60 columns maximum. Paragraph

3.5 describes master/slave expansion.

Table 3-4

Matrix and multiplexer cards

k-en Collector Drive;

The Model 708 Switching System is designed to be used with the cards listed in Table 3-4.

3.42 Connections - instruments to rows

If your application requires few instruments and many DUTs, connect the inslruments to rows (up to eight) and the DUTs to columns (I2 columns per matrix card/switching

matrix, up to 60 columns wilh live matrix cards/switching matrices as stand-alone units or in a master/slave configuralion). This connection scheme is optimum because the rowcolumn path has only one crosspoint as shown in Figure 3-6. Expansion of rows leads to a long, narrow matrix containing one crosspoint as shown in Figure 3.7.

707 I-4 7074-D 7074-M 7075 7076

Semiconductor / 7072 I /Xxl2MatrixCard

Dual 4 x 12 Matrix Card Eight 1 x 12 Multiplexer Card Eight I x 12 Multiplexer Card Eight I x I2 Mulliplexer Card Dual 4 x 12 Matrix Card

8 x 12 Matrix 8 x 12 Matrix 8 x 12 Matrix

8 x 12 Matrix Card 8 x 12 Matrix Card 4 x 12 Matrix Card

Card Card Card

3-6

Source

Note : One crosspoint cIosur~’

1 I ’ ’ ’

2 3 4 .5 (1 7

yields a row-column path

’ ’ ’

’

ti 9 10 II 12

3-7

3.4.3

An alternate connection scheme of the long, narrow matrix has all connections on the columns, both instruments and DUTs. This type of conncclion schcmc is usually used in an expanded switching matrix (refer to paragraph 3.5) when Lhc series of tats requires a large number of instruments and DUTs, with only a few signals for each test. As shown in FigWC 3-8, with two cards, two crosspoint relays must bc closed to complete a path from column-column (a salcty benefit when sourcing). Multiple crosspoint paths, when compared with single crosspoint paths, have additional path resistance and contact potential.

Crosspoint programming becomes more cotnplcx with column-column paths because of the number al’ possible paths for large matrices and the choice of rows to complete the path (refer to Table 3.5),

Connections - instruments to columns

The row completion choice for column-column paths on multiple application cards follows the recommendations givcn previously for row-column paths. With a Model 7072 card, close a crosspoint relay in row A or B Sor low current applicalions, row C, D, E, or I’ for general purpose switching, and row For G for C-V switching.

3.4.4 Connections-partial matrix expansion

External expansion of the cards can also bc used to implc-

ment a partial matrix. As shown in Figure 3-9 (Model 7071

cards), a column connection is made bctwcen unit 3 and unit

4. With the example connections shown, three crosspoints must be closed to source (increasing the safety factor), hut

only one crosspoint closure is needed to measure (rccom-

mended for sensitive instruments).

Table 3-5 Row-column and column-column paths

Possible

paths for 8

rows x 60

c01um”s

480

1830

3.4.5 Multiple application cards

Selecting the correct row connections Sor instruments is im-

portent with cards designed for multiple applications. Using the Model 7072 as an example, the recommended conncctions are:

* Rows A and B (low current) ~ Picoammeters, elcc-

trometers.

. Rows C through F (general purpose) - DMMs, sourc-

es.

* Rows G and I.1 (C-V characteristics) -C-V analyzers.

3-8

3-9

Figure 3-9 Partial matrix expansion example

3.5

Expanding matrix size

3.5.1 Overview - multiple matrix expansion

An 8 x I2 matrix card of the Model 708 Switching System is a building block Car larger matrices. Matrix expansion is accomplished by ihe following two methods.

Backplane row expansion - The Model 708 backplane automatically extends rows from other like cards. Refer to Tablc 3-6 for a list of matrix cards supported by this feature. To enable automatic backplane expansion, one of two special cables must he constructed (refer to paragraph 3.5.7). Two types of backplane expansion arc supported: analog expansion and analog expansion with control (master/slave). Refer to Figure 3.10. Analog backplane row expansion is discussed in paragraph 3.52. To expand using analog expansion with control (master/slave), tirst expand using analog backplant row expansion (paragraph 3.5.2), and then complete using control expansion (paragraph 3.54).

External (to backplane) expansion - External expansion uses adapters, connectors, and cables to connect like cards in

separate Model 708 Switching Systems. Two types of external expansion arc supported: external analog expansion and external analog expansion with control (master/slave). Refer to Figure 3.11. A master/slave connection of up to five switching matrices is an extension of the rows (up to 8 rows by 60 columns). Individual rows and columns can also be connected between cards or between switching malriccs. External analog expansion is discussed in paragraph 3.5.3. To expand using analog expansion with control (mastcr/slavc), first expand using external expansion (paragraph 3.5.3), and then complctc using control expansion (paragraph 3.5.4).

Use Table 3-6 to determine the type al’ row expansion for specific matrix cards.

NOTE

Column expansion (including partial metrix expansion) for all matrix cards is accomplishcd externally to the backplane (refer to paragraph 3.53).

3.10

Gettim Starred

Figure 3-11

3-12

3.5.2 Backplane row expansion

3.5.3 External expansion

IJsc the following procedure as a guidclinc to connect two or more Model 708 Switching Systems containing like cards through the analog backplane. Matrix card rows (refer to Table 3-6, notcs 2 and 3) may be connected together using this method.

NOTE

Analog backplane expansion does nol expand control of separate Model 708 Switching Systems in a master/slave system. This is accomplished through cnnlrol expansion (paragraph 3.5.4).

Determine expansion design. Refer to paragraph 3.5.5 for system expansion issues and 10 paragraph 3.5.8 for sample expanded matrices. Remove power from all Model 708 Switching Systems

and all circuitry. Disconnect power cords. Make sure the Model 708 Switching Systems to bc connected (up to five) have been properly configured. Refer to paragraphs 2.2 and 4.6.1, Using Table 3-6, determine the type of cable “ceded to connecl Model 708 Switching Systems through the connectors. The type of cable (20.pin or SO-pin) will be determined by the type of connectors spccitic to the cards to be used. Also dctcrmine approximate cable length by using the distance between each backplane connection

as a minimum.

NOTE

The number ol connectors used in the cablc will depend on the number of Model 708 Switching Syslems to be connected through the backplane.

IJse the following procedure as a guidclinc to connect two or more Model 708 Switching Systems containing like cards cxlcrnally to the backplane. Matrix card rows or columns may bc connected using this mclhod.

NOTE

External expansion dots not expand con1101 of separate Model 708 Switching Systems in a master/slave sys~cm. This is accomplished through control expansion (paragraph 35.4).

Determine expansion design. Rcfcr LO paragraph 3.5.5 for system expansion issues and LO paragraph 3.5.8 for sample expended matrices. Remove power from all Model 708 Switching Systems and all circuitry. Disconnccl power cords. Make sure the Model 708 Switching Systems to be connected (up LO five) have been prnpcrly configured. Refer to paragraphs 2.2 and 4.6. I. Using Table 3-6 and Table 3-7, determine the type ofcablc, lhc approximate cable length needed, and lhe disLance between each connection needed to connect lhe Model 708 Switching Systems.

NOTE

The numbcr of connectors used in the cable will dcpcnd on the numbcr of Model 708 Switching Systems to be conncctcd through the backplane.

Specilicadons exclude crwrs resulting from the cable.

Specifications exclude errors rcsulling from the cable.

Construcl cable (paragraph 3.5.7). Connect Model 708 Switching Systems through the ap-

propriate backplane connectors. If the system is being set up as a master/slave, continue

expansion. Refer to paragraph 3.5.4.

3-14

Connect Model 70X Switching Systems through the appropriate connectors.

II setting up system as a master/slave configuration, continue expansion. Refer Lo pxagraph 3.5.4.

Table 3-7

Model 70X external exmnsion cables

Mass Terminated Cable (20 ft.)

3.lug Triax-Triax Cable (3 ft.)

707%TRX-IO

3.1~~ Triax-Triax Cable (IO ft.) BNC-BNC Cable (2 ft.)

BNC-BNC Cable (5 ft.)

Mass Terminated Cable (20 ft.) Mass Terminated Cable (IO II.)

7072, 7072-HV, 7 172. 7 I74 r0ws/c0lumns

7073, 7 173-50 rows/columns

7075, 7076 rows/columns

3.5.4 Control expansion using master/slave configuration

Connect each Model 708 at the MASTER/SLAVE IN and OUT connectors using a Model 850 I-I or X50 l-2 cable. Refer to paragraph 1.9 for cable description. If connecting two Model 708 Switching Systems in a master/slave arrangement, two cables will be needed. If connecting live Model 708

Switching Systems in a master/slew arrangement, five cables will be nceded. Refer to Figure 3.12. Column locations for a fully expanded Model 708 arc shown in Figure 3-13.

I. Connect the mestcr unit‘s MASTER/SLAVE OUI’ to

the first slave unit’s MASTER/SLAVE IN.

2. If expanding to more tllatl twn Model 70X Switching Systems, connect the lint slave unit’s MASTERI SLAVE OUT lo the second slave unit‘s MASTER/ SLAVE IN. Continue connecting in this fahion to the

last slave unit.

3. Connect tbc last slave unit’s MASTER/SLAVE OUT to the mas,cr unit’s MASTER/SLAVE IN.

3-15

Figure 3-12

3.16

Columns 1 through 12

Columns 13 through 24

Figure 3-13

Columns 25 ttlr”“gtl 36

Columns 37 through 48

Slavc 4

3.17

3.5.5 System expansion issues

Matrix expansion by Model 708 Switching Systems affects system specifications and speed. The extent OS affect depends on the size and configuration of the switching system.

Rackplanc row expansion decreases isolation among like cards and increases offset current. Is&lion relays (on the Model 7072) and backplane jumpers (for general purpose rows) help decrease lhesc cffccts.

Expansion of units along rows or columns also degrades the isolation and offset current specifications because of the number ofparallcl paths and relays on each signal line.

Issues that affect system speed include: Relay settling time ~ Each matrix card has a predefincd rc-

lay settling time. When card types are mixed in a system, the longest settling time is in effect.

Bus communication - A mastcrlslave setup responds slower to bus commands because all communication is through the master unit and the data transmission among the units is verified with handshaking. Table 3-8 compares some typical response times.

Table 3-8 Response time compurison

Master with four slaves

<55l”S

3.5.6 Documenting system configuration

With the connection flexibility of the matrix topology and the expansion/isolation options of the Model 708, documcntation of the system configuration is important.

An example table for tracking card connections and cxpansion is shown in Table 3-9. Use lhe top portion of the table to now system operalion and size, the FROM/TO portion to list card row and column connections, and the lower portion Sor notes concerning expansion and operalion.

3.18

;vstem size:

Switching System: MastcrlSlavc

Master SIWCI SliLVC2 SkWC3 Slavc4

(Instmmcnt connection or DUT pin)

(Instrument conncclion or IXJT pin)

Row A

B c D E F G

Expansion:

Votes:

Backplane bus (rows through ribbon cable)

_ Point to point writing (rows/columns)

_ Triax cable (rows/columns)

_ Mass terminated cable (rows/columns) ~ _ BNC coax ceblc (rows/columns) _ Partial matrix expansion

~~~

Getting Started

3.5.7 Analog backplane cable construction

The analog backplane of the Model 708 Switching System

has two expansion connections (see Figure 3.14). Each connection is part of a printed circuit board with wirz traces

0.100 inches apart. Use these connections to expand Model 708 rows to the rows of other Model 708 Switching Systems.

The 20.pin connection is used for expansion of coaxial ma-

trix cards (dots not apply to the Model 7077(50 pin) or the Model 7173.50 (no automatic expansion)). The 50.pin connection is used for expansion of general purpose cards. Table 3-6 contains the model numbers of all cards supported by the Model 708 and also describes the appropriate method of cxpansion.

NOTE

Analog backplane expansion does not ex-

pand control of scpwatc Model 708

Switching Systems as a master/slave sys-

tern. This is accomplished through control

expansion (paragraph 3.5.4).

Recommended cable parts (or equivalent)

NOTE

The 20.pin cable does not maintain the 50R characteristic impedance of the analog backplane (the 20.pin cable is intended for DC expansion).

Note: The following cables are available from 3M Corporation.

SO-pin cable

336950 (3M) - 28 341%OOOl(3M) ~ 0. I inch card-edge connector with a cur-

rent rating of IA > 200VDC (one connector required fol each Model 708).

3448-54 (3M) - Strain rclicf (one strain relief required for each Model 708).

The number of conncctorslstrain rclicfs used in the cable will depend on the number of Model 708 Switching Systems to bc connected through the hackplane.

Specilications exclude errors resulting

from the cable.

When manufacturing the cable:

. Keep the cable length as short as possible. Make sure

adequate length is provided to span the distances betwccn the Model 708 Switching Systems. If the Model 708 Switching Systems are not rack mounted, provide

extra clearance if physical layout of the mainframes is subject to change.

. Make sure adequate cable is allowed between each con-

nector placed on the cable.

* Make sure pin I of each connector is aligned for pin I

on each Model 708 connection. The connectorslconncctions are not keyed.

AWG

ribbon cable rated at >200VDC.

NOTE

ZO-pin cable

336920 (3M) - 28 AWC ribbon cable rated at >200VDC.

3461-001 (3M) - 0. I inch card-edge connector with a current rating of IA > 200VDC (one connector required for each Model 70X).

3448-54 (3M) - Strain relief (one strain reliel required for

each Model 708).

3.20

3.5.8 Figures 3-15 through 3-18 contain sample expanded matrix

systems. Use these samples as a guide when designing a matrix system. Refer to paragraph 3.4 for instruments and DUT considerations while designing a matrix system.

Sample expanded matrices

I /

Geftinr Started

3.22

3-23

Gettina Starfed

3.6 Basic switching overview

The following paragraphs provide a step-by-step procedure Sor editing a matrix setup, storing it in memory, and sending the setup to the relays. The steps described arc performed OVCI the IEEE-488 bus. Reler to Section 4 Sot- more operation informalion, including master/slave configurations.

3.6.1 Power-up

Connect the instrument to a grounded AC outlet using the supplied power cable and turn on the unit. The Mode;708 will perform a power-up self-test to check ROM, RAM, card conliguration, stored setups, masterlslavc loop, indicators, and displays.

When the self-test is complete, the Model 708 is configured with:

. All relays opened. * The crosspoint display showing present relay setup. * RELAY STEP to 000 (a pseudo setup memory that is

cleared at power-up and sent to the relays).

. MEMORY STEP to 001.

3.6.2 Selecting make/break and break/make rows

Select make-bcfoorc-break, break~before~make, or the don’1 care operation for the rows. Don’t care is selcctcd by deselecting a makelbrcak or a break/make state. The sclcctions will be in effect for all r&y switching, even if a stored setup is not used. As a gcncral rule, use makeAx& operation for current sowces and break/make operation for voltage sources.

Program the setup using the commands V and W as explained in paragraphs 5.9.21 and 5.9.22.

3.6.3 Modifying a relay setup

Use the Z-copy command (paragraph 5.9.25) to copy the desired setup to the relays and the display.

If you have the optional light pen, toggle the state of acrosspoint LED by holding the light pen perpendicular to and touching the front panel overlay, and pressing the light pen button. Continue editing with the light pen until the aosspoint display shows the desired conliguration.

You also may USC the C ~ close and N - open commands (paragraphs 5.9.4 and 59.13) to control the status of the relays.

For a complete listing of power-up defaults, refer to pua-

graph 4.3.

3.24

3.6.4 Storing relay setup and applying setup to relays

To store the modilied setup, use the Z - copy command (paragraph 5.9.25) to copy the desired setup from the relays to a setup number, which is spccilied when sending the Z command.

Operation

4.1

This section contains a complete, detailed dcscriptio” of each front and KU panel aspect of the Model 708.

Introduction

4.2 Setup data paths

The design of the Model 708 is optimized for high speed switching of relay setups for matrices with a maximum of 8 rows by 12 columns (one unit) to 8 rows by 60 columns (live units). If no rows arc selected for make/break or break/make operation, previously stored setups can be switched to the I%-

lays at a rate of up to 200 setups per second. Besides the triggering of stored setup data to the relays, setup

data can be routed to and from the sources and destinations show” in Figure 4-l. The data paths arc selected by the IEEE-488 bus operations listed in Table 4-l.

In addition to other front and rear panel operations, this scction describes setup data tra”sfirs that ire pcrlbrn~cd front the Model 708 front panel. Section 5 dcscrihcs the bus opcrations that transfer setup data.

Display-Relays Memory-Display

Memory-Relays Memory-Memory

Relays-Display Relays-Memory Relays-Controller

Front panel COPY key (Note I, Automatic operation (Now 2)

Bus conunand or any valid trigger

Automatic operation (Now 3)

Bus commend Bus command

Figure 4-Z

4-l

Operation

4.3 Power-up procedure

4.3.1 Line power connections

Line voltage supply The Model 708 Switching System can be operated from line

voltages of 90.250VAC at line frequencies al SO-6OHz. Line power connections

Using the supplied line power cord, connect the switching matrix to an appropriate AC power source. The female end of the cord connects to the AC receptacle on the rear panel of the instrument. The other end oC the cord connects to a grounded AC oullct.

WARNING

The Model 708 must be connected to a grounded outlet to maintain continued protection against possible shock hazards. Failure to use a grounded outlet could result in personal injury or death due to electric shock.

4.3.3 Power-up self-test and error conditions

During the power-up cycle, the instrument pcrlorms the fol-

lowing tests. The lirst live operations arc transparent to the user unless an error “cc”rs.

A checksum test is performed on ROM, and a read/v&c test is perl’ormed on RAM. If a” error is found, the sclltest continues and the unit error LED (ERR) lights along with crosspoint LED D6 [ROM error) or D7 (RAM error). Override tither type of error with a front panel keypress. The Model 708 will attempt normal operation.

The Model 708 reads identity information from the installed card and performs a checksum test on the data. II the checksum test fails on the cud, the error LED (ERR) lights along with crosspoint LED DS. Override with a front panel keypress. An empty slot will not produce an error,

A checksum test is pcrformcd on all setups in memory. If the instrument detects a checksum error in one or

more stored setups, the error LED (ERR) lights along with crosspoint LED DY. The instrument clears the crosspoints bits of the setup(s) in error. The LEDs remain lit until a key is pressed.

CAUTION

Do not operate the instrument on a line voltage outside the indicated range, or instrument damage could occur.

4.3.2 Power switch

To turn on the power, push in the front panel POWER

switch. Power is on when the switch is at the inner (I) posi-

tion. To turn power off, press POWER a second time.

WARNING

The position of the POWER pushbutton indicates the power status of the Model 708 Switching System. The status of the crosspoint display and the other LEDs are not indications of power being applied to the Model 708. Failure to COTrectly recognize the power statos of the Model 708 could result in serious injury or death due to electrical shock.

NOTE

The setup error condition may bc an indication of a low battery. Cycle power off and on. If the condition reappears, rct’cr to paragraph 7.5 for the battery replacement procedure.

The present card configuration is compared with the unit’s previous configuration. If there is a change, the

100 setups in memory are reformatlcd. The front panel

display is blanked out during this time. Crosspoinl clo-

sures are not alfected. The storage setup for the different cards is changed.

If the unit was previously programmed as a stand-alone

or slave unit, it powers up as a stand-alone. IS the unit was previously programmed as a master, it checks for

additional units in a serial looped contiguratio” and tries

to make them slave units. R&r to paragraph 4.6.4 for

information concerning turning on a master/slave con-

figuration. The error LED (ERR) and crosspoint LED D3 light if there is not a closed loop (the Model 708 can be looped back to itself). Any keypress or IEEE-488 bus

operation will allow the unit to continue as a stand-alone

unit.

The instrument performs the display test, where it illumi-

nates all crosspoint LEDs and all other LED indicators.

4-2

4.3.4 Power-up configuration

After the power-up ~csts and display messages are compleled, the Model 708 assumes the following specific operating .statcs:

. All relays open. * Crosspoint display shows present r&y setup. * Relay Step to 000 (a pseudo setup memory that is

cleared at powcrup and sent to the relays). * Memory Slep to 00 I. * Triggers arc disabled.

Table 4-2 summarizes the power-up conliguration for the unit. The cnlirc power-up process lakes approximetcly live

seconds to complete.

4.3.5 Master/slave power-up

The power-up sequence for Model 708 mainhamcs can be

summarized as follows:

. Units previously programmed as stand-alones or slaves

power up as stand-aloncs.

. A unit previously programmed as a master powcrs up as

a mastcr and tries to initiate a loop connection. If it is successful, other units in the loop becomc slaves. If it is not successful, the error LED (ERR) illuminates and the unit revests to stand-alone operation.

To connect and power up a mastcrlsli~vc conligur;~tion for tbc

lint time, follow these steps:

I. Connect up to live tnainframcs in a daisy-chain (MAS-

TER/SLAVE OUT of one unit 10 MASl‘liR/SI.AVii IN

of next unit). Rcfcr to paragraph 3.5.4 for more infomxnon.

2. Power down each unit.

3. From the rem panel of the dcsircd mas~cr unit. SC, the IEEE-488 address to 30 plus the prcscnt uluc. This action idcntilies the master unit while keeping tbc address at the previous numhcr, which is the maslcr*s IEEl.-4X8 setting minus 30.

4. Power up all the Model 708 Switching Syslcms.

CAUTlON

When it is necessary to cycle power on a slave unit, turn off all units in the master/slave configuration. This proccdurc prevents the open communication and control loop from putting the slave unit in an undesirable state.

Table 4-2

dower-up, reset, undfacror.y d~faulrs

Parameter Relays -~

Stored Setups Unchanged

Relay Step

Memory Step

Digital Output

Digital Power External Trigger

Matrix Ready Master/Slave IEEE-4X8 Address Programmed Settling Time Oms

Make/Break Rows Break/Make Rows Trigger Enable Trigger Source

Power-up/reset default

-.. All opened

000 001 000 Unchanged (user sclccttablc- Jumper WlOl selects intcrnallextemal power) Falling edge

Active low Unchanged (if successful) Unchanged

Unchanged Unchanged Disabled Extcmal

Factory default .~.~ ~~

411 opcncd &II clcucd DO0 301 300 lntcrnal

Falling edge Active low Unchanged IX Oms None selcctcd i None selected / Disabled External

4-3

Operation

4.4

Display

4.4.1 Error LED

Errors are signaled when the error LED (ERR) illuminates. Use the UI - error status command (paragraph 5.920) to retrieve the cause of the CITOT. Table 4-3 lists Model 70X error conditions. Where applicable, the necessary corrective ac-

tion is also given in the table.

4.4.2 IEEE-488 status indicators

The TALK, LSTN, and REM LEDs shown in Figure 4-2 in-

dicate modes when the Model 708 is being programmed over the IEEE-4X8 bus. The TALK and LSTN indicators show when the unit has been addressed to talk or listen. These talk

and listen commands are derived from the unit’s primary ad-

dress. REM turns on to show when the unit is placed in re-

mote by addressing it to listen. All front panel controls

except LOCAL and POWER are inoperative when REM is

on. Local operation is restored by pressing LOCAL unless

the IEEE-488 LLO (local lockout) command is in et’fcct. See

Section 5 for details about IEEE-488 bus operation.

Figure 4-2

IEEE-488 .azfus indicntors

IDDCO Invalid Input

M/S Error*

M/S Loop Down Not in Remote RAM Fail*

ROM Fail* Setup Error*

Trig Ovemm

Checksum test failed on a card.

Invalid device-dependent command,

Invalid device-dependent command option. Send only valid command options (see Section 5).

Invalid crosspoint address, setup location, Enter valid data.

make/break or break/make row, or parameter ““t of range. Error in masterlslavc communication loop Check for a closed loop of MASTER/SLAVE OUT

(overrun, parity, framing, count imbalance, to MASTER/SLAVE IN. or time-out). One or more units connected in master/slave Turn on all units or reconfigure master/slave loop.

loop we not powered up.

“x” character received over IEEE-488 bus, Put Model 708 in remote. but Model 708 is not in remote.

Self-test detected error in RAM.

Self-test detected checksum error in ROM. See troubleshooting in Section 7.

Self-test detected checksum error in stored Affected setup is cleared, and then Model 708 pro-

setup. Battery may be low.

An additional trigger was received before Check the READY bit in the serial poll byte. the Model 708 asserts the READY

Send only valid commends (see Section 5).

See troubleshooting in Section 7.

by all crosspoint LEDs lit.

4-4

4.4.3 Crosspoint display LEDs

4.4.4 Light pen

As shown in Figure 4-3, the crosspoint display has one LED for each crosspoint of a card. Each block has 8 rows (A-H) by I2 columns (I 12) of LEDs. The display LEDs show the present open or closed relay states, or the on/off st&s of a setup presently being edited. The un/oSf states of crosspoint LEDs can be changed by commands over the bus or hy the optional light pen. Modilicd displays can bc stored in memory or sent to the relays.

The light pen is an oplionul input device for toggling the onI off states of crosspoint display LEDs or digital II0 status LEDs. One light pen is used to wntrol the LIIDs of all units in a mastcrlslavc system.

As shown in Figure 4-4, the light pen connector plugs into the front pencl of stand-alone or master units. Kcmovc the

light pen by pressing the button on tbc co~~ncctor plug while

pulling out the plug. Mount the light pen h~~ldcr on the right

handle of the Model 708 by tightening the allcn~hc;ld scrcu shown in Figure 4-4.

To to&c the state of a crosspr)int LID or change the dig-

ital I/O status I.ED with the light pen. pcriorm the follow ing steps:

CAUTION

When changing setups, use caution when the COPY key is enabled (the corresponding COPY LED will be lit). Inadvertent connections may be copied to the relays causing instrument damage.

I. Hold the light pen xs you would an ordinary pen.

2. With the light pen pcrpcndiculer to the fmnt panel overlay at the desired IXD, press the button on the pen’s har-

ICI.

3. Proper usage will to!& the state ofthc LED. If the button is pressed while not on an LED, no change will be made to the Model 708 Switching System display (or rc-

lays if COPY LED is lit).

4-s

F&we 4-4

Light pen

4.5 Crosspoint display

If the displayed setup is modified by trigger or IEEE-488 commands, the crosspoint display changes automatically. If editing a setup, changes to its source do not appear.

CAUTION

When changing setups, use caution when the COPY key is enabled (the ax-

responding COPY LED will be lit). Inadvertent connections may be copied to

the relays causing instrument damage.

4.5.1 Modifying

After choosing the source of the setup, a crosspoint display can be moditied by turning on/off crosspoint LEDs with the light pen. If the COPY indicator is. lit, thcsc actions open or close relays immediately.

The maximum valid column number with a single unit is 12.

If several mainframes are connected and programmed for master/slave operation, the maximum column can be up to 60 (with five units).

The optional light pen can also be used to turn on and off.

crosspoint LEDs. Hold the light pen perpendicular to the front panel overlay at the desired LED and press the button on its barrel. This action toggles the state of the LED.

The maximum number of simultaneously closed crosspoints

depends on the specified drive current per crosspoint of cxh card. The total relay drive current required per mainframe cannot exceed IA.

4.5.2 Copying

The setup data displayed on the crosspoint LEDs can be

stored in the non-volatile memory 01 the Model 708 or can

bc sent directly to the relays by pressing the COPY key or by

sending a device-dependcnt command (DDC). See pan-

graph 5.925 for more information.

With the DDC, the displayed crosspoint configuration is

stored at the setup location specified when issuing the command. It overwrites the present setup data at that location. An invalid input error occurs if you try to copy to a setup location below one or abovc 100.

4-6

In masterlslavc conligurations, each unit stores its own portion of each stored setup.

Digit inputs have an internal pull-up resistor. Open inputs will bc indicated by logic high.

When the COPY key is pressed or the COPY LED is lit, the displayed crosspoint conliguration is sent to the relays. When the COPY LED is lil, any change to the crosspoint display is also sent to the relays at the same time. This aclion is apparent when scrolling lhrough unmodilied stored setups; the memory step and relay step ticlds will seyuencc togcthcr.

For more information on these fields. refer to paragraph S.X.

4.6 Operation control

4.6.1 Digital I/O

The TTL-compatible digital I/O port has sixteen data lines

Sor inputs and sixteen data lines for outputs. The pinouts for the rear panel DB-25 connectors xc shown in Figure 4-5. Status of the input lines is viewed and states of the output lines are programmed through the LED display using the LOCAL/DIGITAL I/O key and the optional light pen, or changed through the IEEE-488 bus. Figurc 4-6 shows input and output configurations.

ports

Digital outputs are ncgativc true. When a logic high is programmed. the output goes low (sinks).

With mastcrislavc conligurations. only the digital 110 ports of the master unit are avail~blc for viewing and programming.

Digital I/O power supply jumper Jumper W I01 sclccts intcmal power supply (its shipped from

factory) or extcrwl (user) supplied power supply. llcfcr to

Section 7 for information on changing rhc powcr supply.

Figure 4-5

4-l

Oneration

4.6.2 External trigger

If triggers are enabled and external trigger is selected as a

source, a TTL-compatible pulse of at lcast 60011s duration at

the rear panel EXT TRIG INPUT jack triggers the Model

708. The input BNC jack is shown in Figure 4.7.

Rising

Edge

Figure 4-7

Hear panel l3NC.jack.r

The unit can

programmed for which cdgc (falling or rising) of the external trigger pulse causes a transfer of stored setup data to the relays. Sample trigger pulses are shown in Figure 4-g. To select which pulse

edge

triggers,

send a

DDC.

For more information, refer to paragraph 5.9.2. I” master/slave conligurations, only the EXT TRIG INPUT

port of the master “nit is active. See paragraph 4.8 for more infommtion on triggering the Model 708.

4.6.3 Matrix ready output

The Model 708 provides a TTL-compatible signal at its rear panel MATRIX READY OUTPUT jack as shown in Figure 4-7. The MATRIX READY signal goes false when relays are switched and goes tme at the end of the programmed settling time. As described in paragraph 4.X. this is also after the re-

lay settling time.

TTI. High

(3.4V Tpical i

TTl. l.“W

(OXV Typical)

-c

8. Rising cdgc of pulse

A. Matrix ready high true

The “nit can be programmed for a high- or low-true MATRIX READY signal (Figure 4-9). To select the active state of the signal, send a DDC. For more infomution, refer to paragraph 5.9.3.

In master/slave configurations, the MATRIX READY signals of all units function, but only the master’s MATRIX READY is an accurate signal.

4-x

Figure 4-9 Sample matrix ready pulses

4.6.4 Stand-alone and master/slave

One method for expanding system size is to connect up to five switching systems in a master/slave conliguraLion. whcrc all units are daisy-chained for serial communication and control. System operations arc performed through the master unit, either over the IEEE-488 bus or the master’s

front panel (including the light pen). A mestcr/slavc system

appc.us as a single unit and IEEE-488 address with a maxi-

mum size ol’ 8 rows by 60 columns. Select stand-alone or master/slave operation hy setting the IEEE-488 addresses of the Model 708 Switching Systems. located on the rear panel oi the Model 708.

As described in paragraph 3.5.4, the MASTER/SLAVE OUT and MASTER/SLAVE IN rear panel c”nn~ct”r~ are used to connect DIN cables in a closed loop. The connector pinouts are dcfincd in Figure 4-10. The rear panel IEEE-48X address switchcs are shown in Figure 4-l I.

USC the rotary switches

Cycle power of all units in the master/slave loop to cstahlish control ofthc slaves through the master. During mi~swlsli~ve operation, most front and rear pawI controls of lhc slave

units arc inactive. Table 4-4 shows slave unit‘s control ;md indicator status.

Figure 4-10

Designate “nc unit to be master by adding 30 to the IEEE488 address (selectable by rotary switches on the rear panel of the Model 708). If the loop of DIN cables is not closed, the master’s error LED (ERR) will light, and all units will rc-

main as stand-alones.

CAUTION

When it is necessary to cycle power on a slave unit, turn off all units in the mas-

ter/slave configuration. This procedure prevents the open communication and control loop from putting the slave unit in an undesirable state.

Switch, indicator, or coonector i Slave unit statw Front Panel

POWER active CROSSPOINT DISPLAY LEDr x1ivc (display only) LOCAL key ~ inxlivc OPEN RELAYS key i inactive TALK, LSTN, REM LEDs inactive Light Pa/Light Pen Connector inactive

Kear Panel MASTER/SLAVE IN

MASTER/SLAVE OUT

EXT TRIG INPUT MATRIX READY OUTPU?

DIGITAI. INPUT and OUTPUT IEEE-488 INTERFACE

The master unit communicates with the slaves only when

ncccssary; it does not continuously monitor the status of the closed-loop configuration. Hcncc, a disconnected master/ slwx loop cable will not bc dctcctcd and the ERR LED will not bc lit until the master attempts to send or rcceiw data sound the loop. To determine if a mastcdslavc error has “ccurred, send a DDC (rcfcr to paragraph 5.920). The steps to recover from an master/slave error arc:

I, The master stops prowssing IEEE-4X8 bus commends.

returns to stand-alone operation, and tcrminatcs.

2. The slave units remain the snme as before the error occurrcd.

3. To re-initialize the loop, make sure mastcrlslavc cables are secure, and cycle power of all units.

~~~~ / ~~~~~~~~~~~~

I aCtlvC / ;;iy;;v,

active (timing accuracy may bc inaccuretc) inactive (outputs set to low) not used

4-0

Operation

4.6.5 IEEE488 bus address

The Model 708 communicates over lhc IEEE-488 bus

through the rear panel connection shown in Figure 4-12. When conncctcd to a bus controller, instrument opcraling modes can be programmed. Note that IEEE-488 common is always grounded.

Figure 4-12

Two rotary switches on the rear panel of the Model 708 arc used to set the IEEE-488 address. One switch is used to set each digit of the address. The primary address of the Model 70X is factory set to 18, but it may be set to any value between 0 and 30 (between 30 and 60 for a master unit) as long as address contlicts with other instrumenls or the bus controller arc avoided. Actual master unit addresses for programming will be 30 less than the address set on the Model

708. To cheek the present primary address, look on the rear panel

of the Model 708. If the value is above 30, the actual IEEE488 address will be 30 less. To change the address, pcrlbrm the following procedure:

4.6.6 Hardware relay settling times

The card specitication relay settling time is the time nccdcd

for the relays to actuate or release (including contact bounce time) and pass a clean signal. Since this specilica~ion is cad dependent, lhe Model 708 must identify on power-up which cards are installed to determine the longest relay sctlling time in the system (stand-alone or master/slave). This value is not user-moditied, but the total settling time for a switch-

ing operation can be lenglhcned by using the programmed

settling time, as explained in paragraph 4.7. I. To view the relay (hardware) settling time or the system, USC

the U6 - stalus command (paragraph 5.9.20).

See paragraph 4.8 for a discussion of settling times and trig-

gcrs.

4.6.7 Self-test

The self-test program is used to check ROM, RAM, and al-

low inspection of the front panel LED indicators. This test is

also part OS the power-up sequence. If you want to run the

test without cycling power, use the JO - self test command

(paragraph 5.9.9).

Il’lhcrc is an error in ROM or RAM, the ERR LED is lit until

a keypress or bus operation. See Section 7 for troubleshoots

ing procedures.

For maslcrlslave configurations. all “nils are tested simulta-

neously, so you might have LO run the test more then once to

inspect all LED indicators. Program 99 will turn on all

LED% This is done by setting the IEEE address switch to YY

and cycling powcr.

I. Power down the unit (stand-alone) or units (master/

slave).

2. Change the position of the rotary switches (Figure 4-12) to the new address.

NOTE

Each device on the bus must have a unique primary address. Failure to observe this precaution could result in erratic bus opcralion. In a master/slave configuration, only the master Model 708 Switching System IEEE-488 address will be used. The IEEE-48X address is updated only at powcr.up.

Section 5 contains detailed inl’ormation on operating the Model 708 over the IEEE-488 bus.

4.10

4.6.8 A command can hc used to rclurn the Model 708 to the fac-

tory default conditions listed in Table 4-2. To initiate this action, use the RO - restore defaults command (paragraph

5.9.17). In master/slave configurations, all units return LO factory de-

faults when this is sent to the master unit.

Factory defaults

4.7 Selecting switching parameters

The Model 708 has three switching parameters that we usermodified: the programmed settling time, make-before-break rows, and break-before-m& rows. The values of these parameters arc in effect for all relay switching until they are changed. To modify the parameter, USC the appropriate cornmand.

4.7.1 Programmed settling times

The programmed settling time is a variable switching delay that can bc used to lengthen the lixed delay al the relay (hardwax) settling time. You can select, in Ims incrcmcnts, up to 65 seconds of additional switching delay.

IS an additional trigger is received during this time, it is prw cesscd and the ERR LED is lit. At the end of the programmed settling time, the Model 708 sets the MATRIX READY output true.

To view the programmed settling time, USC the UO - sLiltus command (paxgraph 5.920).

NOTE

The U6 command sends the longest hardwax settling time for all matrix cards, and the UO command sends the machine status word. The machine status word contains programmed settling times.

I. Crosspoints in breaklmakc rows are opened.

2. Crosspoints in makclbrcak rows arc closed.

3. Crosspoints in makclbreak rows iwz opened.

4. Crosspoints in break/m& rows are closed: crosspoints in don’t c~rc rows arc opened or closed accordingly.

Thcsc steps arc apparent to the user except for the incrcescd settling time. If either makclbrcuk or brcaklmakc rows ilrc not selected. the appropriate steps in the previous list arc dc-

lewd and the total settling time decreases. Recausc makcl hrcak and brcaklmakc operations aSlixt settling limes and trigger rcsponsc, these operations arc further discussed in paragraph 4.8.

To change the status to hrcakimakc, makclbrcak. or don’t arc, rcl’cr to pamgraphs 5.9.21 imd 5.9.22. Sclccting il row

for milkelbrcak dc-sclccts it for breaWmakc and vice vcrs~. The row selection is in cfl‘cct for all units connected in a mas-

tcr/slave configuration The operations arc listed in Table J-5.

To change the programmed settling time, USC the S - programmed settling time (paragraph 5.9.18). Use a value bctwccn 0.65000.

The programmed settling time is in el’iect for all crosspoint relay open or close operations until it is reprogrammed. Its effect on trigger response times is described in paragraph

4.8.

4.7.2 Make/break and break/make rows

Make-before-break switching of relays is dclincd as connecting a new circuit before disconnecting the present circuit. It is used to eliminate transients caused by switching between current sources. Break-before-make switching means to disconnect the present circuit before connecting B

new circuit. It is used to avoid momentary shorting of two voltage sources. Both of these switching operations are supported by the Model 708.

Rows of crosspoint relays are user-selectable for make/ break, breaklmakc, or don’t care operation. The selections will be in effect for all switching until new choices are made. When make/break or break/make operation is chosen, the Model 708 automatically switches the crosspoint relays through intermediate setups to pcrfonn the following steps:

Next state

Make/Break Select Break/Make Sclcct Brcak/Makc DC-sclcct MakelBrc& Sclcct Make/Break De-select Brcak/Makc

When switching current sources. USC makelbrcak operation to keep currcnt flowing nod climinate switching transients. When switching voltage sources. USC break/make opcretion to avoid momentary shorting of two paths together.

BreaWMakc

I3rcakl.Makc

Don’t Carl!

Makell3reak

Don’t Care

4.8 Triggering

When a Model 708 stand-alone or mastcr unit is triggcrcd, the stored relay setup from RELAY STEP+1 is sent to the relays. Triggers ax enabled using the PI command (paragraph

5.9.6). The maximum triggerrate is s

break/make rows sclccted. As described in paragraph 4.8.2,

additional switching delays arc ncccssary with make/break or break/m&e operation.

pecilied with no makelbrcak or

4-l I

Operation

4.8.1 Sources

USC the Ul -error status command (paragraph 5.9.20) to

retrieve the cause of the error.

The programmed trigger source provides the stimulus to increment to the next stored setup. Possible trigger sources include:

. External trigger pulse -An appropriate pulse, applied

to the EXTERNAL TRIGGER INPUT jack on the rear panel, provides the trigger stimulus. The power-up dcfault is set for external triggering.

. IEEE command triggers - IEEE-488 GET, X, or ?&Ilk

commands provide the stimulus when the appropriate source is selected.

Use the T - trigger command to sclcct the trigger source

(.paragraph 5.9.19).

4.8.2 Overrun conditions

Once the instrument is triggered, it begins transferring relay setup data from mainfiamc memory to the cards. If a second trigger is received while the unit is still transferring data, a trigger overrun condition will occur. In this case, the second tngger 1s not processed, and the unit’s ERR LED illuminates.

After the time required for transferring relay data has clapscd, the Model 708 is able to process another trigger. If a trigger is received before the programmed setting time has elapsed, a not settled error will result. Use the UI - error

status command (paragraph 59.20) to retricvc the cause of

the error. Figure 4.13 shows an example setup change and a timing di-

agram of the READY (for trigger) pulse and a high true MA-

TRIX READY pulse when the Model 708 is processing the

trigger. The status of thcsc signals is available in the serial

poll byte (see Section S). This timing is for setups with no

make/break or break/make rows.

When either make/break or break/make operation is selcct-

cd, the Model 708 switches through an intcrmcdiate setup to

ensure proper relay operation. If only m&e/break rows arc

sclccted, the Model 70X performs the following steps:

I. Closes crosspoints in make/break rows yielding an in-

tcrmediate setup.

2. Opens crosspoints in make/break rows and opens/closes crosspoints in don’t care rows yielding the desired sct-

UP.

4-12

IS only break/m&e rows are selcctcd, the Model 708 pcrforms the following steps:

I, Opens crosspoints in break/mzke tows yielding an intcr-

mediate setup.

2. Closes crosspoints in break/m& rows and opens/closes crosspoints in don’t care rows yielding the desired set-

An cxamplc 01 thcsc operations is shown in Figure 4-14 with the corresponding timing diagram. By comparing Figore 4.13 and Figure 4.14, you cao xc that the intcrmcdiatc woo necdcd l’or make/break

brcaklmakc C~USCS il delay in the ass&on of READY and MATRIX READY equal to the relay settling time.

Figure 4-14

Timing with either make/break or brealdmuke rows

4.13

Operation

When a combination of make/break and bretimakc rows is selected, the Model 708 must switch through three intcrmediate setups to ensure proper relay operation. The steps pcrtirmed by the unit arc:

Opens crosspoints in break/make rows yielding the first intcrmcdiate setup.

Closes crosspoints in make/break rows yielding the second intermediate setup.

Opens crosspoints in make/break rows yielding the third inlermediatc setup.

Closes crosspoints in break/make rows and opcns/closcs crosspoints in don’t care rows yielding the desired set-

UP.

Figure 4-15 shows an example setup change with the necessary intcrmcdiate setups. As the timing diagram shows, three additional relay settling time intervals are necdcd for the intermediatc setups.

4.8.3 External trigger input

To use external triggering, lirst select the source as dcscribcd in paragraph 4.X.1. With triggcrs enabled, the unit will then be triggered when an input pulse (with the specifications previously shown in Figure 4.8) is applied to the EXT TRIG INPUTjack. The unit is triggered on either the falling (leading) or rising (trailing) edge of the pulse, as selected by the A ~ external trigger command (paragraph 59.2).

4.8.4 Matrix ready output

The matrix ready output provides a TTL-compatible signal, as shown in Figure 4-Y. This signal can be used to inform other instruments when the total settling time is complete. It is programmable for high or low true by the B - matrix ready command (paragraph 59.3). The leading cdgc of the true level indicates the end of the total settling time (relay settling time plus programmed settling time).

Figure 4-15

7iming with both make/break and brealdmake rows

4-14

4.8.5 IEEE-488 bus triggering 4.9 Reset

To trigger a setup change with an IEEE-488 trigger source, send the appropriate IEEE-488 command over the bus: X, talk, or GET dcpcnding on the sclcctcd source. Trigger on GET allows tbc lastcst IEEE-48X triggering response. See Section 5 for details on bus triggering.

The met operation pcrlbrms the same functions as cycling powcrcxccpt power-up self-checking. ITa mastcrlslavc error is dctectcd during rcsct, the unit will revert 10 slandnlonc upcration. The front panel RESET key is used to initiate n rcsct operation.

Rcscl. prwcr-up, and factory dcfauh conditions arc listed in Table 4-2.

4.15

IEEE-488

5.1 Introduction

This section contains information on programming the Model 708 ovcr the IEEE-488 bus. Dctailcd instructions for all programmable functions arc included. However, information

concerning operating modes presented elsewhere are not ICpeatcd.

5.2 IEEE-488 quick start

The following paragraphs provide a step-by-step procedure for putting a Model 708 on the bus to program some basic commands.

Step 1: Connect the Model 708 to the controller With power off, connect the Model 70X to the IEEE-48X in-

terfacc of the controller using a standard intcrfacc cable.

Some controllers include an integral cable; others require a separate cable. Paragraph 5.3 discusses bus connections in

detail.

Programming

Step 2: Select the primary address

The primary address is a way for the controller to rcfcr to

each dcvicc on the bus individually. Consequently. the ptimay address of your Model 708 must bc the sane as the primary address spccificd in the controIIcr’s programnung language, or you cannot program the instrument. Each dcvice on the bus must hew a diffcrcn~ prim‘ary address.

The primary address of your Model 70X is set to IX at the fattory. but you can set the address to vidues hctween 0 and 30

for a stand-alone unit, or 3 I and 60 for a maax in a masleri slave loop (refer to paragraph 5.5).

step 3: Write your program All operations require a simple program to send commands

to the instrument. Figure 5-I shows a flowchart of a program to select makclbrcak and hrcakllnakc rows. modify cmsspoints of a setup stored in memory, send the setup to the re-

lays, and then rcqucst data of the prcscn, relay setup.

The corresponding program (written in MS QBASIC sup-

plied with MS-DOS 5.0 and later) is contained in three parts for this example. The program assumes a primary IIiEE-488 address of 18 for the Model 708 and that power-up default conditions exist in the unit.

5-l

IEEE-488 Programming

Sample Program

DIM ?.$12001,c$[2001 PRINT Hl,

PRINT Hl,

PRINT #l,

COMMAND : LINE INPUT "cRossPoIms COMMAND", C$

IF LEN (C$)ZO mm SMP

PRINT Ul, GOT0 COMMAND END

"REMmE 18"

'"OUTPUT 18;v11oooooowoooooo1lx~

"OUTPUT la;ElZl, OX"

"O"TPuT le;c$+~x~

Comments

’ Dimension crosspoint input and display. ’ Tell Model 708 (at IEEE-488 location 18) to

listen over bus. Select rows A and B Sor make/break and rows

G and H for break/make.

‘Set edit pointer to setup #l, and send setup #I ’ to relays and display. ‘Allow user to input crosspoint data. ’ Check for null string.

‘Send command string to Model 708.

Allow user to input additional crosspoint data

Step 4: Open and close crosspoints

You can open, close, and clear crosspoints by sending the approp&c command, which is made up of an ASCII letter representing the command, followed by one or more characters for the command options. Commands can be grouped to-

gethcr in one string. The command strings are not opening

and closing relays unless the edit pointer is set to zero.

Select MakeIUreak

andBreak,Make Rows

To open and close crosspoints over the bus, run the previous

program and enter a command string when prompted. Some

example strings arc shown in Table 5 I.

Terminate each string by pressing RETURN on the control-

ler keyboard. If a null string is entered, the program ends,

Table 5-l

Sample strings

?ample string II p1 II

Description

Clear (open) all crosspoints of-

setup #I.

“C.G,A6,B9.B10”

Set (close) crosspoints AS, A6, B9, BlO.

“NC5 A6” ‘%&.2NB9,B10”

Clear (open) crosspoints A5, A6.

Set (close) Al, A2 and clear (open) B9, BIO.

5-2

IEEE-488 Pro~rammine

Step 5: Modify program for requesting data To display or print setup data, you must specify one of the

data output formats that sends ASCII characters. Note that R

variety of data formats arc available, as discussed in paragraph 5.9. The data can be a setup stored in memory or lhc present relay setup. Modiry the previous sanplc program with the following statements. Add the statcmcnts immcdiately before the GOT0 line.

PRINT itl,

“2.lG2.Y

PRINT #l, LINE INPUT #2, A$ PRINT A$

When the program is run with these statcmcnts, il lists the closed crosspoints that you have entered.

Step 6: Modify program for triggering Triggers provide a quick way for copying relay data from a

pre-programmed setup to the relays. Each valid trigger causes the next sequential setup to be copied to the relays and the relay pointer to be updated.

Modify the previous sample program with the following

statements. Add the statements immediately before the END lint.

“cluTP* 18; “ENTER 18”

Set data format Sor setup #I. Get stored setup data

and print.

screws arc located on each connector to ensure that conncctions remain secure. Present standards call for metric threads, as idcntilicd by dark colored screws. (Larlicr versions had silvcr colored screws. Do not USC thcsc connectors with the

Model 708.)

A typical connecting schcmc is shown in Figurc 5-3 Each

cable normally has a standard connector on each cod. These

connectors arc designed to bc steckcd to allow ii number 01 parallel connections on one iostrumcnt. To avoid possihlc damage. do not stack more then three connectors on any one instrument.

PRINT “PP.ESS ANY KEY M Wait for keypress. CONTINUE” w LOOP WHILE INKEYs=” n ’ Enable triggers, select PRINT #l, “0uTm

18;FlT2X”

PRINT #l,“TRIGGER 18” Trigger setup #I to

When any key on the keyboard is pressed, this program modification triggers setup #I to the relays. This is because the relay step pointer, which is different from the edit pointer,

was set to zero by power-up.

5.3

The following paragraphs provide information “ceded to connect instrumentation to the IEEE-488 bus. The Model 708 is connected to the IEEE-488 bus through a cable equipped with standard IEEE-488 connectors. See Figure 5-2. Two

Bus cable connections

trigger-on GET.

relays.

Figure 5-3 IEEE-488 connectiom

s-3

IEEE-488 ProPrammine

NOTE

To minimize intcrfcrence caused by clcctronugnetic radiation, use only shielded IEEE-488 cables. The Model 7007-I and

7007-Z shielded IEEE-488 cables are

available from Keithlcy Inslmments.

Connect the cable to the Model 708 as follows:

I, Line up the connector on the cable with the connector on

the rear panel of the instrument. Figure 5-4 shows the IEEE-488 connector location.

Figure 5-4

IEEE-488 connector location

2. Tighten screws securely, hui do not overtightcn them. (Overtightening can break the connector.)

3. Add additional connectors from other instruments, as required.

4. Make sure the other end of the cable is properly connected to the controller. Some controllers have an IEEE-488 type connector, while others do not. Consult the instmctia” manual of your controller for the proper connecting

method.

{umber

I 2 3 4 5 6 7 8 9

10 II 12 13 14 15 16

21 22 23 24

Contact

designation

DIO I D102 D103 D104 EOI (24)* DAV NRFD NDAC IFC

SRQ

ATN SHIELD D105 D106 Data1 D107 D108 REN (24)* Gnd, (6)* Gnd, (7)* Gnd, (8)* Gnd, (9)* Gnd, (IO)*

Gnd, (I I)* Gnd, LOGIC Ground

IEEE-488 type

Data Date D&i Data

Managetncnt

Handshake

Management

Managemenl

Ground

Data

Management Ground Ground Ground Ground Ground

Ground

s-4

NOTE

The IEEE-488 bus is limited to a maximum of IS devices, including the controller. Also, the maximum cable length is limited to 20 meters, or 2 meters multiplied by the number of devices. whichever is less. Failure to ohservc these limits may result in crratic bus operation.

In mastedslavc configurations, only the

master unit is connected to the IEEE-488 bus. If slave units ax also connected, erratic bus operation results. Custom cables

may hc constructed by using the contact assignments listed in Tahlc S-2 and show” in Figure 5-S.

5.4 Interface function codes

The intcrfacc function codes, which arc part of the IEEE488 standards. dctine an instrument’s ability to support various intcrfacc functions. They should not hc confused with programming commands found clsewhcre in this manual. lnterfacc function codes for the Model 708 arc listed in Tam blc 5.3. The codes detinc Model 708 capabilities as follows:

SHl (Source Handshake) - SHI defines the ability of the Model 708 to properly handshake data or command bytes when the unit is a source.

AH1 (Acceptor Handshake) - AH I dclincs the ability of the Model 708 to properly handshake the bus when it is an acceptor of data or commands.

T6 (Talker) - The ability of the Model 708 to send data over the bus to other devices is dctincd by the Tb function. Model 708 talker capabilities exist only aftcr the instrument has been addrcsscd to talk. T6 means that the Model 708 is a basic talker, has serial poll capabilities, and is unaddressed to talk when it receives its own listen address.

TEO (Extended Talker) ~ The Model 708 dots not hwc extended talker capabilities.

L4 (Listener) -The 1~4 function defines the ability of the

Model 708 to rcccive device-dependent data over the bus.

Listener capabilities exist only after the instrument has been

addressed to listen. L4 means that the Model 70X is a basic

listener and is unaddressed to listen when it reccivcs its own

talk address.

LEO (Extended Listener) - The Model 708 does not have

cxtcndcd listcncr capabilities.

SK1 (Service Request) - The SRI function defines the

ability ol’thc Model 708 to request service from the control-

ICI.

RLl (Remote Local) - The RLI function defines the cepa-

bilities of the Model 708 to he placed in the remote or local

states. PPO (Parallel Poll) ~ PPO mans that the Model 708 dots

not have parallel polling capabilities. DC1 (DeviceClear)-The DCI function dctincs the ability

of the Model 708 to he cleared (initialized). DTl (Device Trigger) -The ability for the Model 708 to

have setups triggered is dcfincd by the DTI function. CO (Controller) - The Model 708 has no controller cape-

hilities.

IEEE-488 Pro~rumminn

Code SHI Source Handshake capahilhy.

AMI Acccptor Handshake capability. ‘l-6 Talker (basic talker. serial poll, mwddressed to

TEO L4 Listener (basic listcncr, uneddresscd to listcn on

’ MLA My LiSW” ,udrcrs~

2 W‘A My’hk kkkcrr

5.5

The Model 708 must rcccivc a listen command heforc i( rcspends to addrcsscd commands. Similarly. the unit must rcccivc a talk command bcforc it transmits its data The Model 708 is shipped from the factory with it primary address set ill

18. The programming cxamplcs included in this manual as-

sumc the address is IX. The primary address may he set to any value bctwcen (I and

30 (hctwccn 30 and 60 for a mnstw unit) as long as address

conflicts with other instruments and the bus controller arc

avoided. Actual master unit addresses (for programming) will bc 30 less than the address set on the Model 708. Note that controllers are also given a primary address. so he sure not to USC this address. Controller addrcsscs arc usually 0 or 21, hut consult the controller’s instruclion manual for details. Make sure the primary address you choose corresponds with the value specified as part of the controller’s programming

language.

7\vo rotary switches on the rear panel of the Model 708 arc

used to set the IEEE-48X address. One switch is used to set

each digit of the unit’s address. A lading zero is required for

addrcsscs 0 through 9.

Interface function

talk on MLA’). No Extended Talker capabilities.

MTA’). No Extcndcd I.islcncr capabilities. Scrvicc Request capability. Remote Local capability. No Farallcl Poll capability. Dcvicc Clear capability. Device Trigger capability. No Controller cap;lbility. Open-collector bus drivers.

Primary address programming

El (Bus Driver Qpe) - The Model 708 has open-collector

bus drivers.

s-5

To check the prcscnt primary address, look on the rear panel of the Model 708. If the value is above 30, the actual IEEE48X address will bc 30 less. To change the address to a new one, pcrtorm the following:

I. Power down the unit (stand-alone) or units (master/

slave).

2. Change the position of the rotary switches (Figure 5-6) to the new address.

NOTE

Each device on the bus must have a unique primary address. Failure to observe this precaution could result in erratic bus operation. In a mastcrlslavc configuration, only the master Model 70X Switching Systems IEEE-48X address will be used.

5.6 QuickBASIC programming

Programming examples arc written QuickBASIC 4.5 using the Keithley KPC-488.2 (or Capital Equipment Corporadon) IEEE interlaw and the HP-style Universal Language Driver (CECHP).

Betin any programming example can be run, the lfnivcrsal Language Driver must be installed. To install the driver, enter ccchp at the DOS prompt.

If you include the CECHP command in your AUTOEXECBAT file, the driver will automatically bc installed each time you turn on your computer.

Program fragments are used to demonstrate proper programming syntax. As the name implies, only a fragment of the whole program is used to avoid redundancy. At the beginning of each program, driver files must bc opened. The input tcrminator should bc set for CRLF. For cxample:

OPEN “ieee” FOR OUTPUT AS #I OPEN “iece” FOR INPUT AS #2 PRINT #I, “interm crlP’

I” Microsoft

Figure 5-6 IEEE-488 bus connrctor and rotary selection switches

Table 5-4

BASIC IEEE-488 ~fammv,f~

Transmit string to device IX. Obtain string from device 18.

Send GTL to device IX. Send SDC to device 18. Send DCL to all devices. Send remote enable. Cancel remote enable. Serial poll device IX. Send local lockout. Send GET to device IX.

A partial list of BASIC statements is shown in Table S-4.

Basic statement

5.7

Indicator and control aspects of IEEE-

488 operation

The following paragraphs discuss aspects of front panel indicators and controls with rcspcct to IEEE-488 operation, including the error LED (ERR), IEEE-488 status indicators. and the LOCAL key.

Card identification err”r A card ID error occurs when the instrument’s power-up rou-

tint detects a checksum error in the information rrom II card. When in mastcrlslavc conliguration. the cards in error are iw dicatcd by all LEDs in their crosspoint display blocks hcing

lit. IDDC (illegal device-dependent command) err”*

5.7.1 Error LED

The Model 708 monitors a number of operations associated with IEEE-488 programming. If an error is found, the Model 708 lights an error LED (ERR). Program the Model 708 to generate an SRQ (paragraph S.Y.l2), and then the U I error status word (paragraph 5.Y.20) can bc chcckcd for spccilic error conditions.

The following paragraphs describe conditions (associated with IEEE-488 programming) causing the front panel ERR LED to illuminate.

Table 5-5

IEEE-48X rrror.~ causirq ERR LED to illuminate

rype of errOr 3rd ID error

~DDC Illegal device-dependent con.DDCO WS error Vat in remote l%gger before settling Unit triggered before total set-

.imc error tling time expired. RAM fail

ROM fail

Setup error

Rig “verm”

Description Power-up routine cannot idcn-

tify one or more cards. mand rcccivcd.

Illegal device-dependent conmand option rcccivcd. Master/slave communication or timing error. X rcccivcd while unit is in LOCAL state.

Power-up routine or self-test detected RAM error. Power-up routine or detected program ROM chccksum error. Power-up mutinc detected checksum errors in one or more setups. (Affected setups are cleared.) Unit triggered before Ready bit

is set.

stir-test

An IDDC error occws when the unit rccc‘ivcs an illegal d&cc-dcpcndcnt command over the bus. ITor cxamplc, the command string In includes an illegal command hccausc the “I” is not part d the instrument’s progrim~ming languilgc.

NOTI:

When an IDDC error is detected in a con-

mand string. all commands in the string. up to and including the next X. xc ignored.

To correct the error condition, send only valid commands.

Rcfcr to paragraph 5.Y for dcvicc-dcpcndcnt command prw

gramming details. An IDDC error is Ilagged in the I: I word,

as discussed in paragraph S.Y.20.

IDDCO (illegal device-dependent command option)

error

Sending the instrument a legal command with an illegal op-

tion results in an IDDCO error.

For example, the command KYX has ;m illegal option (Y) that

is not pert of the instrument’s programming language. Thus,

although the command K is valid. the option is not. and the

IDDCO error results.

NOTE

When an IDDCO error is detected in a command string. all commands in the string. up to and including the next X, arc ignored.

To correct this crtor condition, USC only valid command options. as discuw UI word, as discussed in paragraph 5.Y.20.

A mastcrlslavc error occurs when a communication or timing error is detected in the clarcd loop of units. It’ one or more errors arc detected, the error LED (ERR) is lit.

,d in paragraph 5.Y. An error is llaggcd in the

s-7

IEEE-48X Prqramming

To simulate the error condition, disconnect a DIN cahlc from either of the MASTER/SLAVE connectors. The condition is detected when the Model 708 performs the next opcratio” that requires communication among the units. A master/ slave error is llaggcd in the Ul word, as discussed in paragraph 5.920.

Not in remote error A not in rcmolc error occurs if the instrument receives a”

“x” while it is in the local state. This is caused by failing to set the REN line true before addressing the Model 708 to listen. A not in remote error is flagged in the UI word, as discussed in paragraph 5.9.20.

Trigger before settling time error A lriggcr before settling time error occurs when the instru-

ment rcceivcs a” additional trigger before the settling time has expired. This time period is after assertion of the RBADY signal and before assertion of the MATRIX READY signal. See paragraph 4.8 for a complete discussion of trigger timing. Both READY and MATRIX READY are bits in the SPOLL byte; MATRIX READY is also a rear pancl signal. Note that a master/slave error is also Bagged in the UI word, as discussed in pwagraph 5.9.20.

Overrun triggers do not affect the instrument except to generate the error. In other words, the present setup change is not aborted by the overr”” trigger stimulus, and the trigger is ignored. Note that a trigger overmn error is also flagged in the Ul word, as discussed in pamgraph 5.9.20.

5.7.2 Status indicators

The TALK, LSTN, and REM indicators show the present IEEE-488 status of the instrument. Each of these indicators is described below.

A trig&r during this time period is processed normally. RAM or ROM failure

A RAM or ROM failure occurs when the power-up routine detects a” error, either a RAM error or a checksum error in program ROM. If an error is detected, the error LED (ERR) is lit (clcarcd by any keypress).

Setup error A setup error occurs when the Model 708 power-up routine

detects a checksum error in one or more setups stored in “on-

volatile memory. If a” error is detected, the error LED (ERR) is lit and the affected setups arc cleared to all open. A key-

press will clear this error. Note that a setup error is also

flagged in the Ul word, as discussed in paragraph 59.20.

Trigger overrun (hardware) error A trigger ovum” occurs when the instrument is triggered

while it is still processing a setup change from a previous trigger and before the READY (for trigger) signal is asserted. READY is a bit in the SPOLL byte. See paragraph 4.8 for a complete discussion of trigger timing. The exact trigger stimulus depends on the selected trigger source, as discussed in paragraphs 4.X.5 and 5.9.19.

Figure 5-7 IEEE-4X8 indicators

TALK -This indicator is on when the instrument is in the talker active state. The “nit is placed in this state by addressing it to talk with the correct MTA (My Talk Address) command. TALK is off when the unit is in the talker idle state. The instrument is placed in the talker idle state by sending it an UNT (Untalk) command, addressing it to listen, or with the IFC (Interface Clear) command.

LSTN -This indicator is on when the Model 708 is in the listener active state, which is activated by addressing the instrument to listen with the correct MLA (My Listen Address) command. Listen is off when the unit is in the listener idle state. The “nit can be placed in the listener idle state by sending UNL (Unlisten), addressing it to talk, or by sending IFC (Intcrfacc Clear) over the bus.

REM-This indicator shows when the instrument is in the remote state. Note that REMOTE dots not necessarily indicate the state of the REN line, as the instrument m”st be addressed to listen with REN true before the REMOTE indicator turns on. When the instrument is in remote, all front

panel keys except for the LOCAL key are locked out. When REMOTE is turned off, the instrument is in the local state, and front panel operation is restored.

5-x

Effect on Model 708

Goes into effect when ncx~ addressed LO listen

Goes into talker and listener idle states.

LOCAL key locked out.

Cancel remote, restore front panel operation.

Return to default conditions.

Return to defauh conditions.

Triggers setup with GET source.

NOTE

The instrument need not be in remote to bc a talker. All front panel controls (cxccpt LOCAL and POWER) arc inoperative while the instrument is in remote. You can restore normal front panel opcmtion by pressing the LOCAL key.

5.8.3

The IFC command is sent by the controller to place the Modcl 708 in the local, talker, and listener idle stales. The unit re-

sponds to the IFC command by canceling front panel TALK or LSTN lights, if Lhc instrument was previously placed in one of those states.

5.8.4

The LLO command is used to prevent local operation of the instrument. After the unit receives LLO, all of its front panel controls cxccpt POWER are inoperative.

IFC (interface clear)

LLO (local lockout)

Note that the DCL command is not an addrcsscd command, so all instruments cquippcd to implement DCL will do so simullaneously. When the Model 708 rcccives a DCL command, it returns to the power-up default condilions. DCL

does not affccl the programmed primary address.

5.8.7 SDC (selective device clear)

The SDC command is an addrcsscd command that performs essentially the same function as the DCL. command. Howevcr since each device must be individually addressed, the SDC command provides a method to clear only selected instm-

mats instead of clearing all instruments simultaneously, as is the case with DCL. Any devices on lhc bus that arc addressed to listen are cleared. When the Model 708 receives ihc SDC command, it returns to the power-up default condilions.

5.8.8 GET (group execute trigger)

GET may be used to iniliate a Model 708 setup change if the instrument is placed in the appropriate trigger source. Relcr to paragraph 5.9 for more information on triggering.

5.8.5

The GTL command is used to take the instrwncnt out of the remote state. Operation of the front panel keys will also be restored by GTL unless LLO is in effect. To cancel LLO, you must set REN false.

5.8.6 The DCL command may be used to clear lhe Model 708 and

return it to its power-up default condilions (see Table 4-Z).

S-IO

CTL (go to local)

DCL (device clear)

5.8.9 SPE, SPD (serial polling)

The serial polling sequence is used to obtain the Model 708

serial poll byte. The serial poll byte contains important infor-

mation about internal functions,

59.12. Generally, the serial polling sequence is used by the controller to detcrminc which of several instruments has requested service with the SRQ line. However, the serial polling sequence may be performed at any time to obtain the serial poll byte from the Model 708.

as dcscribcd in paragraph

IEEE-488 Pro~rumming

Parameter Relays

Stored Setups Relay Step Memory Step MastcrlSlavc IEEE-4X8 Address External Trigger Matrix Ready Digital Output Edit Pointer Trigger Enable Data Format EOI/Hold-off

SRQ

Digital Output Programmed Settling Time Trigger Source

Make/Break Rows Break/M&c Rows

Terminator

Factory default All opened

All cleared 000 00 I Stand-alone

IX (Note I )

BO Db, 0 EO

GO KO MO 0000 so T7 voooooooo woooooooo YO

Power-up, DCWSDC

All opcncd

Not affected

000

00 I

(Notes 2, 3)

Not affcctcd A0 BO

Db, 0 EO FO GO

0000

Not afkctcd

Not afl’ectcd

Description

Point to relays Point to setup I

Falling edge triggers Negative true Ouqmt lines low Point to *clays Triggers disabled Full output, all data sent in one talk Both cnablcd Disabled Output lines low Oms External trigger

None sclcctcd None selcctcd <CR><LF>

5.9 Device-dependent command (DDC) programming

5.9.1 Overview

IEEE-488 device-dependent commands control most instrument operating modes. All front panel modes (such as trigger

source and settling time), as well as some modes not available from the front panel (like SRQ and terminator) can be

programmed with these commands.

Command syntax Each command is made up of a single ASCII capital letter

followed by one or more numbers or letters representing an option(s) of that command. For example, the trigger source can be set over the bus by sending the letter “T” followed by

anumber representing the trigger option. TIX would be sent

to trigger on talk. The IEEE-488 bus treats these commands

as data; they arc sent with the ATN line false.

Some commands permit more than one option: these must hc separated with conunas. For cxamplc. the close crosspoints commands have the gcncral format:

Crc(.rc)...(,rc) Here the “rc” options iwe row and colum~l ;tddrcsses, while the

commas indicate the necessary dclimitcrs. The parcnthcses illdicate that the option and associated delimiter are optional.

NOTE

Do not include parcnthcscs in actual aommand strings.

Multiple commands A number of commands can be grouped together in one com-

mand string, which is generally terminated by the “x” chiuacter. This character tells the instrument to cxecutc the command or commend string as described in paragraph

5.923. Commands sent without the X character arc not cxc-

5-l I

IEEE-488 Programming

cutcd at that particular time, but they are stored within an internal command huffer for later execution when the X chamcter is tinally received.

If a particular command occurs “n” times in a command string, then the “nth” occurrence is the only one used (i.e., TOT2T4X appears to the Model 708 as T4X).

Invalid commands

If an invalid command is sent as pti of the command string, no commands in the string are executed. Under these condi-

tions, the instrument displays a front panel error tncssagc

(IDDC or IDDCO), as described in paragraph 5.7, and it can

be programmed to generate an SRQ (Service Request), ils

discussed in paragraph 5.9.12. Checking is done as syntactical groups ~I’characters arc received.

Valid command strings (typical samples)

Single command string. Multiple command string. Space is ignored Multiple-option command string (options sepnrated by commas).

Invalid command strings (typical samples)

K7x

Invalid command as I is not a valid command.

Invalid command option as 7 is not a valid “p-

tion of the K command.

cA4cQx

Invalid option (maximum column address is

60).

ZOlOOX

Multiple-option command without the ncccssa’y separating commas.

Order of command execution

Table J-10 Order of command execution

lrder Command Description

__---- Exc&tc DDCs. -

I 2 R 3 L

Restore factory default conditions. Download setups from controller lo

Model 708. 4 E 5 6

;

7 P

Set the edit pointer.

Insert a blank setup in memory.

Delete a setup from memory.

Clear all crosspoints at specified

setup.

8 Z

Copy a setup from memory or

relays to memory or relays.

V IO W II N

Select rows from m&e/break. Sclcct rows for hrcak/makc. Open crosspoints of setup indicated by edit pointer.

Close crosspoints of setup indicated

by edit pointer.

Select trigger edge of External Trigger pulse.

I4 B

Select logic sense of Matrix Ready

signal. IS P I6 G I7 J

EnabWdisablc triggers.

Select data output formal.

Execute ROM/RAM/display self-

test.

IX K

Sclcct EOI and hold-off on X.

I9 M Set the SRQ mask.

20 0 21 S 22 T

Set the digital output. Program the settling time.

Select the trigger source. 23 u Rcqucst status. 24 Y

Select terminator characters.

..~

Device-dependent commands are not necessarily executed in

the order received. Rather, each instrument always executes them in a specific order. The order of execution for the Model 708 is summarized in Table 5-10. Note that the X command is listed first sincc it is the character that forces the execution of the rest of the commands.

If you wish to force a particular order of execution, include the execute (X) character aitcr each command option grouping in the command string. For example, the following string would be executed in the received order: T6XAlXROX

5-12

Device-dependent command summary

All Model 708 device-dependent commands are summarized in Table 5-l I, which also lists respective paragraphs where

more detailed information on each command may be found.

Table 5-l 1

DDC summary

lode kternel Trigger

latrix Ready :lose Crosspoint )i&ll Output

:dit Pointer :nablc/Disable Triggers Iala Format

nscrt Blank Setup

;e1s-test

iO1 and Hold-off

I )ownload Setups s ;RQ

)pcn Crosspoint

ligital Output

:lear Crosspoints )elete Setup

<estore Defaults ‘rogrammed Settling Time rrigger

Command A0

Al RO BI Crc(.rc)...(,rc)

Db, s EO En FO FI GO Cl G2 or G3 G4 GS G6 G-l In JO KO Kl K2 K3 K4 KS Lbbb..X MO Ml

M2 M8 Ml6 M32

Ml28

Nrc(,rc)...(,rc)

OVVVVV

Sll

TO orTl

T2 or T3

T4 or TS

T6 or T7

Description Falling edge triggcl-s Model 70X

Rising cdgc triggcrs Model 708 Negative tmc Matrix Rudy output Positive tmc Matrix Ready output Close crosspoints of setup indicated by edit pointct (nws A-H, columns l-60) Set slates of digital output lines (b=l to 16, s=O to I) Point to prcscnt r&y setup Point to stored relay setup (I-IO(l) Disable triggers Enable triggers Full output. all data in one talk Full output. one switching system row per talk Inspect output, all data in one talk Condcnscd output, all date in one talk Condcnscd output. one switching system per talk Binary output, all data in one talk Binary output, one switching system per talk Insert blank setup in memory (I 100) Pcrfcxm self-test

Send EOI. hold-off on X until Ready No EOI, hold-off on X until Ready Send EOI, do not hold-off on X No EOI, do not bold-off on X Send EOI, hold-off on X until Matrix Ready No EOI. hold-off on X until Matrix Ready Download setups from controller to Model 708 SRQ disabled Not used Not used Matrix Ready Ready for trigger Error Not used Open crosspoints of setup indicated by edit pointer (rows A-H, columns l-60) Set states of digital output lines (v = 000.65535) Open all crosspoint relays Clear all crosspoints of stored setup (I -100) Delete setup from memory (I 100) Restore factory defaults

Program settling time in milliseconds (O-65000) Trigger on talk Trigger on GET Trigger on X Trigger on External Trigger pulse

~ 5.9.2

5.Y.3

~.5

.9.9 : .‘).I0 ~

.Y.lI ~

.‘).I2 1

913 i

,.Y.IJ I i.9.15

i.Y.16 ~

i.Y.17 1 i.9.lX ;

1.9.19 i.Y.20

5.13

Table 5-l 1 (cont.)

DDC ,summary

Mode status

&Gikc/Brc& Break/Make %ccute

rerminator

lopy setup

Command uo

UI u2.s u3 114 US,” U6 u7

Vabcdefgh Wabcdefgh X

YO YI Y2 Y3 ZO,n Z&O Zm,n

Description Para. Send machine status word

5.9.21 Send error status word Output setup “s” (O- 100) with prcscnt G format Send RELAY STEP pointer Send number of slaves

Send model numbcr olcach card in unit ‘II” (O-4) Send relay settling time Send digital input of unit (0.65535) Select rows for make/break operation (abcdefgh = 00000000

5.9.22

to 11111111)

Select rows for break/m&c operation (abcdefgh = 00000000

5.9.23

to 11111111) Execute commands 5.9.24 <CR><LF> 5.9.25 <LF><CR> <CR> <LF> Copy present relay setup to memory location “n” (I 100)

5.9.26 Copy setup from memory location “II” (l-100) to relays Copy setup from location “m” (O- 100) to location “n” (0.100)

s-14

5.9.2 A- External trigger Purpose

Format

Parameters

Default

Description

Programming note

Example

To select which edge of an external trigger pulse initiates ii lriggcr. All n=O

n=l Upon power-up or aher receiving a DCL. SDC. or NIX command. the instrument defaults to A0

(falling cdgc). The An command lets you program lhc Model 708 SW triggering on a VI.-compiltihle falling

or rising cdgc signal at the l’.xtcmal Trigger input jack. A lriggcr signal incrcmcnts the Rl3.AY

Falling edge triggers Model 708 Rising edge triggcrs Model 708

STEP pointer and copies the setup indicated by the new value drum memory to the relays. l’igurc 5-9 shows example trigger pulses. Trigger on cxternid must bc the sclectcd source

(T command), and triggcrr must bc cnahled (F command). I’m information on the hardware this command is used with. rcfw to paragraph 4.6.2.

IEEE-488 Propzmming

5.9.3 B -Matrix ready Purpose

Format

Parameters

Default

Description

Programming notes

Example

To select the logic sense of the rear panel Matrix Ready signal. Bn WO

WI Positive true Matrix Ready output Upon power-up or after receiving a DCL, SDC, or ROX command. the instrument defaults to BO

(negative true). The B command lets you program the TTL-compatible Matrix Ready output as a high- or low-

true signal. This signal goes false when the relays are switched; it goes true after completion of the (hardware) relay settling time and (user) programmed settling Lime. Figure S-IO shows cxample Matrix Ready signals.

2. Changing the logic sense of the Matrix Ready signal dots not change the logic sense of the

PRINT #l, PRINT hl, "OuTrn 18;BOX"

Negative true Matrix Ready

I. The Matrix Ready signal is negated by anything that causes a change to a rel;iy state even il

no relays actually change state (e.g., closing an already closed relay).

Matrix Ready bit in the serial poll byte.

"OIJTPIPT 18:BlX"

output

Select positive true Matrix Ready Select negative true Matrix Ready

5-16

Fipm 5-10 Matrix ready pulse

5.9.4 C-Close crosspoint

Purpose

Format

Parameters

Description

Programming notes

Example

To close crosspoints in B setup.

Crc(,rc)...(,rc)

r = A 1” II Row designation of crosspoint c = I to 60 Column designation of crosspoint (60 with maximum of live Model 70X units)

The C command closes crosspoints in the setup indicated hy the edit pointer. IS the edit pointer indicates the present relay setup (zero). the specified crosspoint relays arc closed immcdiatcly. If the edit pointer indicntcs a setup stored in memory (I-100), the spccilicd crosspoints are set.

I, Do not include parentheses in command strings. They indicate that the option and iwociiwxl

comma delimiter arc optional.

2. Up to 25 crosspoints per mainframe can bc spccilied in one close command (wide a master and four slaves, the limit is 125 crosspoints). In the same command string, up to 25 crosspoints per mainframe can bc opcncd. If cithcr limit is excccdcd, an IDDCO ~.csuIts.

3. The maximum value OS the column parameter dcpcnds on the conliguration (I? for standalone, 60 for master with four sla~c units). An IDDCO rccsuI~s iS lhc maximum value is cxceedcd.

4. This command is equivalent to multiple light pen operation(s).

5.9.5 D - Digital output

Purpose

Format

Parameters

Default

Description

Programming notes

Example

To set the states of the digital output lines. Db.s b = I to 16 Output bit position

s=Oto I Upon power-up or after rccciving a DCL, SDC, or ROX command. the instrument defaults to

DO.0 (all digital outputs set to logic low). This commend sets individual output lines of the digital 110 port, whcrc “1” is logic high and

“0” is logic low.

I. In a master/slave configuration, only the output of the master unil is updated.

2. Output is negative true logic. Setting a bit high will make an output go low (sink).

3. The 0 command can also be used to set the states of digital output lines. PRINT Hl.

0 = off, I = on

“OIJnwT 18;D3,1x”

‘Turn on digital output 3

5.17

IEEE-4X8 Propramminz

5.9.6 E - Edit pointer

Purpose

Format

Parameters

Default

Description

Programming notes

Example

To set the edit pointer En n=O Present relay setup

n=I to 100 Stored relay setup Upon powcr-up or after receiving a DCL, SDC, or ROX command, the instrument defaults to EO

(present r&y setup). With the edit pointer, you can sclcct which setup is affected by subsequent close (C) and opt”

(N) commands. This can be the prcscnt

I, The edit pointcr value is independent of the Relay Step and Memory Step values.

2. When using the edit pointcr, it is not necessary to use the COPY key, because you arc closing/ opening crosspoint relays or setting/clearing stored crosspoints directly and not just turning

on/off crosspoint LED%

PRINT #l,

5.9.7 F - Enable/disable triggers

“OUTPUT 18;EOX” “OUTPlrr 18;E50X”

Xhiy

setup (zero) or one of the stored setups (I-100).

Point to relays Point to stored relay setup 50

Purpose

Format

Parameters

Default

Description

Programming notes

Example

To enable/disable triggers.

Fn n=O

Disable triggers

ll=I Enable triggers

Upon

power-up or after receiving a DCL, SDC. or ROX command, the instrument defaults to FO

(triggers disabled).

With the F command, you control whether the Model 708 responds to a trigger (from the external trigger connection or over the IEEE-488 bus). A trigger increments the Relay Step pointer

and copies the setup indicated by the new value from memory to the relays. It is good programming practice to disable triggers below changing the trigger source.

PRINT 81, “CIIJTPUT

. . .

PRINT Hl, “OUTPUT 18;FlX”

18;FOX"

Enable triggers

Disable triggers

S-18

5.9.8 G -Data format

Purpose

Format

Parameters

Gn n=o

n= I n=2 or 3 Inspect output format, all data scnl in one talk n=4 Condensed output formet, all data sent in one talk II=5 n=6 n=7

Default

Upon power-up or after rccciving ii L)CL, SDC, or ROX command, tbc instrumcnl defaults 10 GO (full output format, all data sent in one talk).

Description Overview

The G command specifics the format of crosspoint data sent by the Model 70X ow LIK IEEE48X bus in response to the U2 command. Data conccming tbc setup is sent by a “U2.n” cornmand (either the present relay setup or a stored setup). You can control the data fornut and quality sent. The full, condcnscd. and binary formats list Ihc open or closed states crosspoint in the setup; the inspect format shows only closed crosspoints.

GO, Gl = Full output format With the GO/G1 full output formats. the open or closed states of all cmsspoinls in a sclup arc

sent in printable ASCII. An ASCII “-” rcprcscnls an open cross scnts a closed crosspoint. For GO, all data is sent in one talk; for G I, the data from one nnx’ ol

one switching system is sent per talk. An example 01 these formals is shown in Figure 5-l I

lhc example setup ofTable 5-12.

Full oulput formal, all data sent in one talk

Full output format, one row ol’onc switching syslcm per talk

Condensed output format. one switching system per talk Binary output format. all data sent in one talk Biniq output format, one switching system per talk

oi cveq

point, and an ASCII “x“ rcprc-

ior

G2, G3 = Inspect output format With the G2lG3 inspect output formats, the row/column address oSeach clorcd crosspoinl in ii

setup is sent in printable ASCII. An ASCII letter (A-H) rcprescnls a row. and an ASCII string of up to two numbers (O-60) represents a column. Successive crosspoints are sepilratcd with a conme. All data is sent in one talk. Figure 5. I2 shows the fomuts of the example setup in Table S- 12.

G4, G5 = Condensed output format The G4/G5 condcnscd output formats specify the states of all crosspoints with eight bits rcprc-

senting the tight crosspoints of a column. A set bit indicates a closed crosspoint. The hcxedccimal representation of the binary value formed by these eight hits is sent as two printehlc ASCII chwactcrs. For G4, all data is sent in one talk; for G5, the data from one swilching system is scnl per talk. An example of thcsc formats is shown in Figure 5-13 for the example setup ofTable S-

12.

G6, Gl = Binary output format The G6/G7 binary output formats specify the states of all crosspoints with 8~1 R-hit group of bits

representing the eight crosspoints of a column, A set hit indicates a closed crosspoint. For G6.

IEEE-488 Programming

all data is sent in one talk; for G7, the data from one switching system is sent per talk. These

formats are shown in Figure 5-14 for the example setup of Table 5.12.

Closed crosspoints Al,A2, B3, B5, C7, C8, D9, DIO, FI I, 1’12

A13,Al4,ClS,C16,E17,ElX

A25, A26, H27, I-130, A36 A37, H38, H43, G48 G49, MO, A51, H55, H56, ES7, E60

Obtaining data Generally, data is placed into a string or numeric variable. For example, a typical input sequcncc

in BASIC is:

PRINT #I, “ENTER 18”

LINE ILYFTJT #2, cRossPoIIm$ In this example, the complete crosspoint string is placed in the CROSSPOINTS; variable.

5-20

IEEE-488 Programming

Programming notes

I. Table 5-13 lists the number of hytcs thwl arc transmitted for the vxious data formats.

2. Sincc the data is transmitted in continuous strings (without carriage rctums or line feeds). you must format the data for display or printing legibility.

Stand-alone Bytes per

talk 121

I4 (Note I) (Nolc 2) (Note 2) 32 32

Ih 16 Ih

1 Master with four slaves

32 x0

Figure 5-11 Wand Cl full outputformats

5.21

I. Data is shown as the hexadecimal represeniarion of D-bit binary numbers (Figure .5-15).

2. Carriage returns, lint feeds, spaces, and blank lines are nor xnt. They are shown here to improve read&l-

3. “Xx” represents a l-byte checksum value (hexadecimal) in printable ASCII.

4. The rows that correspond fo the C4,C5 data are:

Figure 5-13 G4 and G5 condensed outpurfoimats

s-22

IEEE-488 Propramminp

IEEE-488 Programming:

5.9.9 I - Insert blank setup

Purpose

Format

Parameters

Description

Example

5.9.10 J -Self-test

Purpose

Format

Parameters

Description

To insert a blank selup in memory. In

n=l to 100 Stored relay setup. During execution of this commend, setups “n” through 99 are shifted up to the next highesl lo-

cation in memory (99 to 100, YX to Y9... n to n+l). Then, all crosspoinls of setup “n” arc cleared.

The front panel display is blanked during an inserl operation.

PRINT ill,

To test ROM and RAM.

Jll

II=0 The self-test command stuts execution of Lhc ROM and RAM. If an error is detected, the error

LED (ERR) lights. Also, the self-test failed bit is set in the U I error status word (paragraph

59.20). Any front panel keypress or bus command extinguishes the error LED.

“OUTPZPT 18;150”

Perform self-test

Insert blank setup at location 50

Programming notes

Example

I, The value “n”, if sent, must bc zero.

2. Allow approximately four seconds for the instrument to complete the sell-tcsl.

3. The instrument holds off bus operation with the NRFD line during self-test operation. Thus,

PRINT itl, “OoTPwr 18;.JOX”

5.9.11 K - EOI and hold-off

Purpose

Format

Parameters

Default

To enable/disable EOl and bus hold-off on X.

Ktl

n= 0 Send EOI with last byte, hold-off on X unlil Ready

n = I No EOI, hold-off on X until Ready

n = 2 Send EOI with last byte, do not hold-off on X n = 3 No EOI, do not hold-off on X n = 4 Send EOI with last byte, hold-off on X until Matrix Ready

n = 5 No EOI, hold-off on X until Matrix Ready Upon power-up or after receiving a DCL, SDC, or ROX command, the instrument defaults to KO

(send EOI with last byte, hold-off on X until Ready).

no commands can be sent during the self-lest if hold-off on X is cnabled.

1 Pcrform

sdr--test

5-24

Description

The EOI line provides one method to positively identify the last hytc in the dala string sent by

the instrument. When cnablcd, EOI is asserted with the last hytc the instrumcnl sends over Ihe bus.

Bus hold-oil allows lhc inslrumcnl~u temporarily hold up bus operation via the NKI’D line when it rcccivcs the X characlcr until all commands arc processed. The adwntagc of using bus holdoff is that no commands arc missed while the instrumcnc is mands. Typical hold-ofl limes arc discussed in paragraph 5. I I.

processing previously rcccivcd con-

Programming notes

I. Some controllers rely on EOI to tcrminatc their inpul sequences. Suppressing Ii01 may ciusc

the controller input scqucncc 10 hang.

2. When reading B buffer, EOl is asscrlcd only at the end oi Ihc entire buffer transmission.

3. When cnahled, EOI is asscrtcd with the last byte in the lcrmina~or.

4. When bus hold-ofiis enabled, all bus aclivily is held up for the duri~tion of the hold-oil period, not just for the duration of the communication with the Model 708.

Example PRINT ill,

PRINT 111,

5.9.12 L - Download setups

Purpose

Format

Parameters

Description

To download setups from the conlrollcr to the Model 70X. Lhbbh...X

bbbb... reprcscnts the G4/G5 or G6/G7 output string.

This command downloads setup infornxttion in a G4lGS or GhlG7 data formal. It is used in cw-

junction with the U2 command (outpul setup data) to back up or expand the setups stored in the

Model 708. G formats are discussed in paragraph 5.9.7: see paragraph 5.9.20 Sor U commands.

“OUTPUT 18;KlX”

“OUTPUT 18;K2X” ’ Send EOI with IasL by& do not hold-off on X

’ No EOI. hold-off on X until Ready

Programming notes

Example

I. The data format for downloading is specified by the Ci formal presently in cffcct.

2. The setup data suing begins with a setup number and unit number and ends with a chccksunl

3. The setup numhcr is spccilicd in a U2,n command (outpul sclup “n”). as shown in Ihc following programming cxamplc.

DIM sETUP$ [32] PRINT #l, PRINT #l.

PRINT #l.

LINE INPUT #Z, SETUPS

PRINT SETuP$l1,61 PRINT sETuP$~7,301 PRINT SE’I’UP$[31,321 PRINT “PRESS ANY KEY To CONTINUE” Do ImE WIIILE 1iwEf$= u t>

PRINT #I, “OUTPLrr 18; “L”+smP$+“x” ”

“REMOTE 18” “OuTPrn l*;G4”2,1X” “rnER 18”

’ Dimension for stand-alonc ’ Setup #I in G4 format

Get setup data

’ Print setup and unit numbers

Print setup data card by curd Print checksum Inspect setup dala

‘Wait for kcyprcss

Download setup hack LO 708

5.25

IEEE-48X Programming

5.9.13 M - SRQ and serial poll byte

Purpose

Format

To program which conditions gcncratc an SRQ (service request) Mn

Parameters n=O

n=l Not used n=2 Not used n=4 n=x n= I6 ~32 Error ~128 Not used

Default

Description

Upon power-up or after receiving a DCL, SDC, or ROX command, the instrument defaults to MO (SRQ disabled).

The SRQ command selects which conditions cause the Model 708 to generate an SRQ (service request). Once an SRQ is generated, the serial poll byte can be checked to dctcrminc if the Modcl 708 was the instrument that generated the SRQ, and, if so, what conditions caused it.

The general format of the SRQ mask used to gcneratc SRQs is shown in Figure 5-l 5. By sending

the appropriate M command, you can set the appropriate bit(s) to enable SRQ gcncration if those

particular conditions occur. Possible conditions ‘arc:

* The Matrix Ready signal has been asscrtcd (MS). * The Ready (for trigger) signal has been asserted (Ml6). * An error has occurred (M32). The nature of the error can he determined by reading the Ul

SRQ disabled

Not used

Matrix Ready

Ready for trigger

error word as described in paragraph 59.20.

S-26

Ready lor Trigger

Figure J-15 SRQ mask and serial poll byte format

Matrix Ready

IEEE-488 Pro~mmwnin~

Serial poll byte The general format of the serial poll byte is shown in I’igurc 5-15. Note that all bits except for

bit 6 correspond to the bits in the SRQ mask. Thcsc bits flag the following conditions: Matrix ready (bit 3) -Set whenever the Matrix Ready signal is asserted. Clcarcd hy the start of

relay switching. Ready for trigger (bit 4) - Set when the Ready signal is swxIcd. This bit is clcarcd by:

I. Receipt of X. Start of relay switching.

2. Front panel keypress on master unit.

3. Changing MakelBreak or Break/Make row.

4. Pcrlorming self-test. Error (bit 5) - Set if an error condition occurs. Cleared by rexling the 111 error status word

(paragraph 5.920). SRQ (bit 6) - Set if the Model 70X requests scrvicc via the SRQ lint: clcercd by a serial poll.

Programming notes I. The serial poll byte should bc read once the instrument has gcncratcd an SRQ to clear the SRQ

IiK!

2. All bits in the serial poll byte latch when the instrument generates an SRQ.

3. If an error occurs, bit 5 (error) in the serial poll byte latches and remains so until the II I wo~‘d is read (paragraph 5.920).

4. Multiple error conditions can bc programmed by adding up the individual comnland wlucs. For example. send M12X for SRQ under matrix ready and digital I/O interrupt conditions.

Example

PRINT 111, PRINT Hl, PRINT #l.

“CLEAR 18” 8 l?lmOTE 18 x “0m!pTpuT 18;M32x”

PRINT #l. “Om’PU’I 18:.%2X”

WAITSRQ :

IF m’r(srq% (, I ‘THEN GOTO WAIT SRQ

PRINT 81,

“SPCLL 18” INPUT 82, s PRINT “B7 736 B5 134 83 82 131 BO” FOR 1=-l m 0 STEP-1 PRINT BIT (S.1) ;

NEXT I

PRINT PRINT iii,

PRINT 81,

“0uTP~ 18;“lx” “ENTER 18”

LINE INPUT 112, ERROR$

PRINT ERRORS

’ Program for SRQ on error

Attempt to program invalid option

Cheek intcriw! status

‘Wait for SRQ to occur

Serial poll the instrutnent Reed serial poll byte Label the hit positions

’ Loop tight timcs

Display the bit positions

Program Sor error status Get Lll St&US to clca error

’ Display error status

5-27

IEEE-488 Programming

5.9.14 N - Open crosspoint

Purpose

Format

Parameters

Description

Programming notes

Example

To open crosspoints in a setup

Nrc(,rc)...(,rc)

r=A to H c=l to 60

The N command opens crosspoints in the setup indicated by the edit pointer. If rhe edit pointer indicates the prcscnt relay setup (zero), the specified crosspoint relays arc opened immediately. If the edit pointer indicates a setup stored in memory (I -lOO), the specikied crosspoints ‘are cleared.

I. Do not include parenthcscs in command strings. They indicate that tbc option and associated

comma delimiter are optional.

2. Up to 25 crosspoints per mainframe can be specified in one open command (with a master and four slaves, the limit is 125 crosspoints). In the same command string, up to 25 crosspoints per mainframe can be closed. If either limit is exceeded, an IDDCO results.

3. The maximum value of the column parameter depends on the configuration (12 for standalone, 60 for master with four slave units). An IDDCO results if the maximum value is ex-

ceeded.

4. This command is equivalent to multiple light pen operation(s).

PRINT #l,

Row designation of crosspoint

Column designation of crosspoint (60 with maximum 01 live Model 708 units)

“0tlTm 18:NA55X” Open one crosspoint “OtlTPuT 18:NA55,A56,B49,850X” ’ Open multiple crosspoints

5.9.15 0 - Digital output

Purpose

Format

Parameters

Default

Description

Programming notes

Example PRINT

To set the states of the digital output lines.

OVVVVV

vvvvv=OOOOO to 65535 Upon power-up or after receiving a. DCL, SDC, or ROX command, the instrument defaults to

000000 (all digital outputs set to logic low). This command is a decimal representation of the statcs of individual output lines of the digital

I/O port, whcrc “I” is logic high and “0” is logic low. Bit assignments and corresponding connector pins are shown below:

I. In a master/slave configuration, only the output of

2. Leading zeros arc not necessary in the parameter value.

3. This command is equivalent to a multiple light pen operation(s).

4. Output is negative true logic. Setting bit high will make output go low (sink).

Hl,

PRINT In,

“OUTPUT

“O”‘IT”T 18;OOX” ’ Restore default condition

18:015X" ‘Set bits <3-O> high

Decimal value of digital output

the

master unit is updated.

5.2R

5.9.16 P-Clear crosspoints

IEEE-488 Proerammine

Purpose

Format Pn

Parameters n=O

Description

Programming note

Example

5.9.17 Q - Delete setup

Purpose

Format

Parameters

To clear all crosspoints at the spccilicd setup.

Present relay setup

n=I 1” 100 S1ored r&y setup The P command clears all crosspoin& in the setup indialed by its parxm13er. IIthc prcscnl rcla)

setup (zero) is spccificd. all crosspoint relays arc opcncd immcdiatcly. If wlup stored in mcmor) (I -100) is spccilied, all crosspoints ol’lha~ setup arc cleared

This command is cquivelcnl 10 multiple trunl panel key pl-csscs

PRINT 111,

PRINT #l.

To delete a setup l’rom memory

“OUTPUT 18; POX”

“OUTPUT 18;P2ox” Clear relay rc,up 20

open all relays

Q”

n=l LO 100 Stored relay setup

Description

Programming note

Example

During execution of this command, setups “n+ I” through IO0 arc shilted down to the nchl Iwxr

location in memory (“nt I” to “n”... 100 10 99). Then, all crosspoints of setup #IO0 arc clcarcd.

The from panel display is blanked during a delete operation.

The command QlOO clears all cmsspoinls ol”rclay setup 100

PRINT #l,

“OUTPUT 18;Q5OX”

Delete relay setup #50 from memory

5-29

IEEE-488 Programming

5.9.18 R - Restore defaults

Purpose

Format

Parameters

Description

To restore the Model 708 to factory default conditions. Rn

n=O

An RO command performs the following actions:

DDC parameters are set to the values shown below:

BO EOOO FO GO

Restore factory defaults

- All setups stored in memory are cleared. * M&/Break and Break/Make rows arc cleared. * A Device Clear operation (all crosspoint relays are opened, Relay Slcp pointer is set to 000,

Memory Step is set to 001).

KO MOO0 000000 sooooo T7 voooooooo woooooooo YO

lnitiatc trigger on falling edge of External Trigger pulse.

Set Matrix Ready output signal to negative true. Set edit pointer to present relay setup.

Disable triggcrs.

Set full output format, all data sent in one talk. Send EOI with last byte, hold-off on X until ready. Disable all SRQ sources. Set all digital outputs to logic low. Set user settling time to zero. Trigger Model 708 on external trigger pulse. De-selecl all rows for make/break. De-select all rows for brealdmakc.

Set terminator characters of <CR> <LF>.

Programming note

Example

The primary IEEE-488 address and masterlslavc operation are not affected by the Restore cornmand.

PRINT Hl.

5.9.19 S - Programmed settling time

Purpose

Format

Parameters

Default

Description

To program the settling time. Sn

n=O LO 65000

IJpon power-up or after receiving a DCL, SDC, or ROX command, the instrument defaults to SO (programmed settling time of zero).

With the S command, you can program the settling time (up to 65 seconds). The programmed settling time starts after the longest relay settling time has clapsed.

"OUTPIPT 18;ROX"

Time in ms

‘Restore default conditions, clear setups

s-30

IEEE-488 Programming

Programming notes

The total settling time equals the longest relay settling time of any card in the system plus any

user-programmed settling time. I’igurc 5. I6 shows a timing diagram of the sctlling times. Additional timing diagrams are given in paragraph 4.X.2.

READY und MATRIX READY sipd riminK

Example

5.9.20 T-Trigger

Purpose

Format

Parameters

Default

Description

Programming notes

PRINT fil. PRINT ifl,

To select the trigger source. Ttl

n=O or I II=2 or 3 n=4 “15 n=6 or I

Upon power-up or after receiving a DCL, SDC, or ROX command, the instrument defaults ttr T7 (Trigger on External Trigger pulse).

With the trigger command, you can detcrminc the trigger source over the bus or from an external trigger pulse. A valid trigger incrcmcnts the Relay Step pointer by one. stopping at 100. and copies the setup data indicated by the new value to the relays.

I. Duplication of trigger sources allows compatibility with other Kcithley IEEI~i-488 instruction

sm.

2. Disabling triggers before changing the trigger source is a good progremmmg practlcc.

“IxJlTm 1R;S5000X” “0tm?uT 18;SilX”

Trigger on talk Trigger on GET Trigger on X Trigger on External Trigger pulse

’ Program 5 second (5000 ms) settling time ’ Rcstorc default condition (0 ms)

5-3 I

IEEE-488 Projwunminn

3. If the unit is re-triggered while it is still processing a previous trigger, a Trigger Overrun or Trigger Before Settling Time Expired error occurs, depending on when the additional trigger occurs. The timing diagrams are shown in paragraph 4.8.2.

4. To trigger the instrument when using the trigger on talk, you must send the talk command derived from the correct primary address. The factory default primary address is 18. Trigger on

talk does not occur when the Model 708 becomes a talker, but rather as the controller rcqucsts the first byte of data from the unit.

5. Trigger on GET allows the fastest IEEE-488 triggering response.

6. The X character that is sent when programming a trigger on X source triggers the instrument.

Example

5.9.21 u -status

Purpose

Format

Parameters

Disable triggers, program trigger on talk. ’ Enable triggers ’ Trigger next setup

’ Disable triggers, program trigger on GET

Enable triggers

Trigger next setup

To obtain instrument status and system configuration. Un

Un,s Un,u

n=O Send machine status word. n=l Send error status word. ” = 2,s Output setup “s” (o-100) with present Ci format. n=3 Send value of RELAY STEP pointcr. n=4 Send number of slaves. n = 5,~ n=6 Send longest relay settling time. n=7 Send digital input of unit.

Send ID of each card in unit “u” (O-4).

5.32

Description

Overview By sending the appropriate U command and then addressing the instrument to talk as with nor-

mal data, you can obtain information on machine status, error conditions, and other data.

UO Machine status word

The format of UO is shown in Figure 5.17. The letters correspond to modes programmed by the respective device-dependent commands. Returned values correspond to tbc programmed numeric values. The values shown in Figure 5-17 arc the default values.

Ul Error status word

The U I command allows access to Model 708 crux conditions. The error SI~IIUS word (I’igurc 5

IS) is a string ol’ASCII characters rcprescnting binary bit posilions. Keading the U I stillus cicxs the error bits. An error condition is Ilagged in the serial poll byte while any bits in the error status word arc set. The instrument can bc progrilmmcd to generate an SKQ when an error condition occurs (see paragraph 5.9.12).

s-33

IEEE-48X Prmrammina

The various bits in the Ul error status word are set when the following conditions are present: IDDC -An invalid device-dcpcndent command (IDDC) is received lDDC0 - An invalid device-dependent command option (IDDCO) is received Not in Remote-An X command is received over the bus, but the Model 708 is not in remote. Self-test Failed -The self-test detects a program ROM checksum error or a RAM error. Trigger Overrun (Hardware) -A trigger is received bclbre the Ready signal is asserted. The

trigger is ignored. Trigger Before Settling Time Expired -A trigger is received before the Matrix Ready signal

is asserted. The trigger is processed. Master/Slave Loop Error-There is a communication or timing error in the masterlslavc loop. Power-up Initialization Failed -The power-up routine has detected a checksum error in the

inlbrmation from one or more cards. Setup Checksum Error-The power-up routine detects a checksum error in one or more set-

ups stored in memory. (The aflwtcd setups are cleared.) U2,n Formatted setup

With the U2 command, you can request the Model 708 to output data of tither the present relay

setup (n = 0) or a stored setup (I < = n < = 100) according to the G format presently in effect. (See paragraph 59.7.)

U3 Relay step pointer

The U3 command (Figure 5-l 9) requests the value of the Relay Step pointer, which indicates the

last setup sent to the relays (000 < = nnn < = 100).

ldcntifier

Figure 5-19

CJ3 relay step pointer

U4 Number of slaves

With the U4 command (Figure 5.20), you can quest the number of slaves present in a master/ slave loop conliguration (between 1 and 4).

5-34

Figure 5-20 u4 number of .slave.s

U5.u Card IDS

Figure 5-21 lJ5 card idenrijicarion

Iden,tificl

CIIXI, 1,mmmmmm <TEKM+EOI>

U6 Relay settling time The LJ6 command (Figure 5.22) requests the Model 708 to output Ihc longest relay settling time

of all cards in the system (expressed in milliseconds).

Identifier

r-7

RSTnnnnn <TERM+EOI>

I I 7 milliseconds

Figure 5-22

lJ6 relay setrling rime

IEEE-4KR Programming

U7 Digital input

The U7 command (Figure 5-23) requests a decimal value of the inputs at the digital I/O port. In master/slave configurations, the digital input of the master unit is sent.

ldcqtifier

DIN iiiii, <TERM+EOI>

L..

tnput (000.hSS35)

Programming notes

5.9.22 V-Make/Break

Purpose

Format

PC3Kim&rS

I. The instrument transmits the appropriate status word only once each time the corresponding

U command is received.

2. To ensure that correct status is indicated, the status word should be requested immediately after the command is transmitted. The status sent by the Model 708 is that which is present at the time it is instructed to talk, not at the time the U command is received.

3. The bits in the Ul error status word latch and remain in that condition until the Ul word is read.

4. The programmed terminator (default CR LF) is transmitted at the end of each status word. Also, EOI is transmitted at the end (unless disabled with the K command).

5. If no Ii command has been received, the PRINT #l , “ENTER I R” and LINE INPUT #2, A$ commands request the letter (x) and number (nn) of the softwarc revision for a stand-alone unit or the master unit of a master/slave configuration (708xnn). It is sent with two lmiling

spaces plus the terminator and EOI.

To select rows for m&e/break operation, Vabcdefgh abcdefgh= 00000000 All rows de-selected for make/break

1 I1 1111 I All rows selected for m&e/break

5-36

Description

The V command selects individual rows for make/break (make-before-break) operation. A “1” in the rcspectivc row field selects make/break; a “0” de-selects make/break operation.

Programming notes

I. Specifying fewer than tight numbers in the parameter field (e.g., VI I I I) is invalid. The Mod-

el 708 takes no action on the rows and flags an IDDCO error.

2. The rows can be programmed for one of three switching options: mekclhrcak. brcak/makc, or don’t cxc. A row cannot hc selected for both makc/brcek and brcak/makc at the same tinlc.

Selecting it for one de-selects it for the other.

3. When switching corrcnt sources, USC makelbrcak opcretion to keep curcn~ llowi”g and climinetc switching transients. When switching voltage SOU~CL‘S, USC break/m&c opcra~ion to

avoid momentary shorting of two paths togcthcr

4. Given the present states and actions

pcrfornlcd, LhC next Slates of IhC 1’ows iwz listed below:

Example

5.9.23 W-Break/Make

Purpose

Format

Parameters

Description

Present state Don’t cart

MakclBrcilk

Break/Make

PRINT #l,

PRINT 111,

To select rows for makc/brcak operation Wabcdefgh abcdcfgh: 00000000 All rows dc-sclcctcd for break/make

The W command sclccts individual rows for brcaWmakc (break-before-make) opcratioo. A “I” in the respective row licld selects btcak/makc: a “0” dc-selcctr brcaklmake operation.

Action Next Sclcct Make/Break Make/Break

Dc-select MakclBreak Don’t Care Select Makc/Brcak Make/Break De-select MakclBrcak Don’t Care Select MakclBrcak MakclBrcak Dc-select MekclBrcak BreaklMakc

“OuTPm 18;V1111OOOOX” Select rows ARCD for makclhreak “O”TPU’I 18;VOOOOOOOOX” Restore default conditio”

I I I I I I I I All rows sclcctcd for hreaWmakc

state

Programming notes

I. Specifying fewer than eight numhcrs in the parameter tield (e.g.. WI I I I) is invalid. The Mod-

cl 708 takes no action on the rows and llags a” IDDCO error.

2. The rows can be programmed Sor one of three switching options: make/break, brcak/makc. or don’t care. A row cannot bc selected for both makclbrcak and break/make at the same time. Selecting it for o”c de-selects it ior the other.

3. When switching current sources, use make/break operation to keep current flowing and climinate switching transients. When switching voltage sources. USC brcaklmakc operation to

avoid momentary shorting of two paths together.

4. Given the present states and actions performed, the next states of the rows arc listed below:

Present State

Don’t Care

Make/Break

BE&IMakC

Action Next State

Sclcct Break/M&c BreaWMakc De-select Break/Make

Sclcct Break/Make BKXk/M&C De-select Rreak/Makc Makc/Bre& Select BrcaklMakc De-select Break/Make

Don’t Cart

BrcaklMake Don’t Care

5-31

IEEE-488 Proprammin~

Example PRINT

5.9.24 X - Execute Purpose

Format

Description

Programming notes

Example PRINT 81,

“OUTPU’I 18;W1111OOOOX”

Hl,

PRINT #l,

To direct the Model 708 to execute d&cc-dependent commands received since the last X. <command> X The execute command is implcmcntcd by sending an ASCII X over Lhc bus. Its purpose is to

direct the Model 708 to execute other device-depcndcnt commands. Generally, the execute character is the last byte sent in the command string; however, there may bc some cases when it is desirable to send a string of characters at one time and then send the execute character later on.

1. Commands or command strings sent without the X character arc not executed at that time, hut they are stored in an internal command buffer for later cxccution once the X character is tinally received.

2. The X character can also be used to trigger, as described in paragraph 5.9.19.

3. Commands are not necessarily executed in the order sent (see Tahlc S-10). To force a particular command sequence, include the X character after each command in the command string.

“OVTPPT

18;WOOOOOOOOX"

“OUTPTPUT 18;ElX”

PRINT #l,

PRINT (11,

PRINT #l, PRINT 111.

“OJTPUT

"OUTPTP~J'I 18:T6XAlXRlX" "O"TP"T 18;GX'l" "OUTPUT 18;X"

18;ElCA47X"

’ Select rows ARCD for break/make

’ Restore default condition

Execute single command Execute multiple commands Force command sequence

‘Send string without execute

Now execute command string at later time

5.9.25 Y-Terminator

Format

Parameters

Default

Description

To select the ASCII terminator sequence that marks the end of the instrument’s data string or status word.

Y”

n = 0 <CR><LF>

n = 1 <LF><CR> n=Z<CR> n=3<LF>

Upon power-up or after receiving a DCL, SDC, or ROX command, the instrument defaults to YO

(<CR><Lfi). By using the Y command, you can program the number and type of terminator characters the

instrument sends at the end of its data string. Available terminator characters are the commonly

used CR (carriage return, ASCII 13) and LF (line feed, ASCII IO) characters. These terminator

characters are recognized by most controllers.

5-38

Tektronix 708 Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual