Agilent E1460A User Manual

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Agilent Technologies E1460A 64-Channel Relay Multiplexer Module User’s Manual

*E1460-90006*

Manual Part Number: E1460-90006

Printed in U.S.A. E0101

Contents

E1460A Relay Multiplexer User’s Manual

AGILENT TECHNOLOGIES WARRANTY STATEMENT ............................................7

Safety Symbols............................................................................................................8

WARNINGS.................................................................................................................8

Chapter 1

Getting Started ............................................................................................................11

Using This Chapter ....................................................................................................11

Multiplexer Description...............................................................................................11

Multiplexer Components .....................................................................................11

Channel Relay Sw itches .....................................................................................12

Control Relays ....................................................................................................13

Basic Operating Modes ......................................................................................14

Configuring the Multiplexer........................................................................................15

Warnings and Cautions ......................................................................................15

Setting the Logical Address Switch ....................................................................16

Setting the Status Register Switch .....................................................................17

Setting the Interrupt Priority ................................................................................ 17

Configuring the Switch Card Wire Jumpers ........................................................18

Installing the Multiplexer in a M ainframe ............................................................21

Connecting the A nalog Bus ................................................................................22

Configuring Terminal Modules....................................................................................23

Standard Terminal Mo dule Desc r iption ...............................................................23

Terminal Module Option A3E Description ...........................................................23

Connecting User I nputs ......................................................................................25

Wiring Terminal Modules ....................................................................................26

Attaching Terminal Modules to the Multiplexer ...................................................28

Programming the Multiplexer.....................................................................................29

Checking SCPI Drivers .......................................................................................29

Multiplexer Addressing .......................................................................................30

Initial Operation ...................................................................................................34

Chapter 2

Using the Relay Multiplexer .......................................................................................35

Using This Chapter ....................................................................................................35

Multiplexer Commands/States................................................................................... 35

Switching Channels ...................................................................................................37

Switching Channels Comments .......................................................................... 37

Switching Channels Examples ...........................................................................38

Scanning Channels ....................................................................................................43

Scanning Channels Comments ..........................................................................43

Scanning Channels Examples ............................................................................44

Miscellaneous Multiplexer Functions .........................................................................51

Using the Scan Complete Bit ..............................................................................51

Using the Analog Bus .........................................................................................52

Saving and Recalling States ...............................................................................56

Detecting Error Conditions .................................................................................56

Synchronizing the M ultiplexer ............................................................................. 58

Chapter 3

Relay Multiplexer Command Refer ence ...................................................................59

About This Chapter ...................................................................................................59

Command Types ....................................................................................................... 59

Common Commands Format .............................................................................59

SCPI Commands Format ................................................................................... 59

Linking Commands .............................................................................................61

SCPI Commands Reference .....................................................................................61

ABORt ........................................................................................................................62

ARM...........................................................................................................................63

ARM:COUNt .......................................................................................................63

ARM:COUNt? .....................................................................................................64

INITiate.......................................................................................................................65

INITiate:CONTinous ........................................................................................... 65

INITiate:CONTinuous? .......................................................................................66

INITiate[:IMMediate] ...........................................................................................66

OUTPut...................................................................................................................... 68

OUTPut:ECLTrgn[:STATe] ..................................................................................68

OUTPut:ECLTrgn[:STATe]? ................................................................................ 69

OUTPut[:EXTernal][:STATe] ................................................................................69

OUTPut[:EXTernal][:STATe]? ..............................................................................70

OUTPut:TTLTrgn[:STATe] ...................................................................................70

OUTPut:TTLTrgn[:STATe]? .................................................................................71

[ROUTe:] .................................................................................................................... 72

[ROUTe:]CLOSe .................................................................................................72

[ROUTe:]CLOSe? ............................................................................................... 74

[ROUTe:]FUNCtion .............................................................................................75

[ROUTe:]FUNCtion? ...........................................................................................76

[ROUTe:]OPEN ...................................................................................................77

[ROUTe:]OPEN? .................................................................................................79

[ROUTe:]SCAN ...................................................................................................79

[ROUTe:]SCAN:MODE ....................................................................................... 80

[ROUTe:]SCAN:MODE? .....................................................................................82

[ROUTe:]SCAN:PORT ........................................................................................ 82

[ROUTe:]SCAN:PORT? ......................................................................................83

STATus....................................................................................................................... 84

STATus:OPERation:CONDition? ........................................................................86

STATus:OPERation:ENABle ...............................................................................86

STATus:OPERation:ENABle? ............................................................................. 86

STATus:OPERation[:EVENt]? ............................................................................ 87

STATus:PRESet .................................................................................................87

SYSTem .....................................................................................................................88

SYSTem:CDEScription? .....................................................................................88

SYSTem:CPON .................................................................................................. 89

SYSTem:CTYPe? ............................................................................................... 89

SYSTem:ERRor? ................................................................................................90

TRIGger.....................................................................................................................91

TRIGger[:IMMediate] ..........................................................................................91

TRIGger:SLOPe .................................................................................................92

TRIGger:SLOPe? ...............................................................................................92

TRIGger:SOURce ............................................................................................... 92

TRIGger:SOURce? .............................................................................................94

IEEE 488.2 Common Commands Reference ...........................................................95

SCPI Commands Qu ick Reference............................................................................96

Appendix A

Relay Multiplexer Specific ations ...............................................................................97

Appendix B

About This Appendix..................................................................................................99

The Base Address ..............................................................................................99

The WRITE Registers .......................................................................................102

The READ Registers ........................................................................................102

Status/Control Register .....................................................................................103

ID and Device Type Registers ..........................................................................104

Relay Control Registers ....................................................................................104

Programming Examples........................................................................................... 1 07

Appendix C

Relay M ultiplexer Error M essages ..........................................................................1 15

Index .............................................................................................................................117

Notes:

AGILENT TECHNOLOGIES WARRANTY STATEMENT

AGILENT PRODUCT: E1460A 64-ChannelRelay MultiplexerModule DURATION OF WARRANTY: 3years

1. AgilentTechnologiesw arrants Agilenthardware, accessoriesand supplies againstdefects in materials and workmanshipfor the period specified above. If Agilent receives notice of such defects during the warranty period, Agilent will, at its option, either repair or replace products which prove to be defective. Replacement products may be either new or like-new.

2. Agilent warrants that Agilent software will not fail to execute its programming instructions, for the period specified above, due to defects in material and workmanship when properly installed and used. If Agilent receives notice of such defects during the warranty period, Agilent will replacesoftwaremedia which does not execute its programming instructions due to such defects.

3.Agilentdoesnotwarrantthat the operationof Agilentproductswillbe interruptedor errorfree. IfAgilentis unable, withina reasonable time,to repair or replace any product to a conditionas warranted,customer will be entitledto a refund of the purchase price upon prompt return of the product.

4. Agilent products may contain remanufactured parts equivalent to new in performance or may have been subject to incidental use.

5. The warrantyperiodbeginson the date of deliveryor on the date of installation if installedby Agilent. Ifcustomer schedules or delays Agilentinstallation more than 30 days after delivery, warranty begins on the 31st day from delivery.

6.Warranty doesnot apply to defectsresultingfrom(a) improperor inadequatemaintenanceor calibration, (b) software,interfacing,parts or supplies not supplied by Agilent, (c) unauthorizedmodification or misuse, (d) operation outside of the publishedenvironmental specifications for the product, or (e) impropersite preparation or maintenance.

7. TO THE EXTENT ALLOWED BY LOCAL LAW, THE ABOVE WARRANTIES ARE EXCLUSIVE AND NO OTHER WARRANTY OR CONDITION, WHETHER WRITTEN OR ORAL, IS EXPRESSED OR IMPLIED AND AGILENT SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTY OR CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, AND FITNESS FOR A PARTICULAR PURPOSE.

8.Agilentwill be liablefor damaget o tangiblepropertyper incidentup to the greaterof $300,000 or the actualamount paidfor theproduct that is the subjectof the claim, and for damages for bodily injury or death, to the extent that all such damages are determined by a court of competent jurisdiction to have been directly caused by a defective Agilent product.

9. TO THE EXTENT ALLOWED BY LOCAL LAW, THE REMEDIES IN THIS WARRANTY STATEMENT ARE CUSTOMER’S SOLE AND EXLUSIVE REMEDIES. EXCEPTAS INDICATED ABOVE, IN NO EVENT WILL AGI LENT OR ITS SUPPLIERS BE LIABLE FOR LOSS OF DATA OR FOR DIRECT, SPECIAL, INCIDENTAL, CONSEQUENTIAL (INCLUDING LOST PROFIT OR DATA), OR OTHER DAMAGE, WHETHER BASED I N CONTRACT, TORT, OR OTHERWISE.

FOR CONSUMER TRANSACTIONS I N AUSTRALIA AND NEW ZEALAND: THE WARRANTY TERMS CONTAINED IN THIS STATEMENT, EXCEPT TO THE EXTENT LAWFULLY PERMITTED, DO NOT EXCLUDE, RESTRICT OR MODIFY AND ARE IN ADDITION TO THE M ANDATORY STATUTORY RI GHTS APPLICABLE TO THE SALE OF THIS PRODUCT TO YOU.

U.S. G overnment Restricted Right s

The Software and Documentationhave been developedentirelyat private expense.They are delivered and licensed as "commercial computersoftware" as defined in DFARS 252.227- 7013 (Oct 1988), DFARS 252.211-7015 (May 1991) or DFARS 252.227-7014 (Jun

1995), as a " commercial item" as definedin FAR 2.101(a), or as "Restricted computer software" as defined in FAR 52.227-19 (Jun

1987)(or any equivalent agency regulationor contract clause), whichever is applicable. You have only those rights provided for such Software and Documentation by the applicable FAR or DFARS clause or the Agilent standard software agreement for the product involved.

E1460A 64-Channel Relay MultiplexerModule User’s M anual

Edition 6

Documentation History

All Editions and Updates of this manual and their creation date are listed below. The first Editionof the m anual is Edition 1. The Edition number incrementsby 1 whenever the manual is revised. Updates,which are issued between Editions, contain replacement pages to correct or add additional information to the current Edition of the manual. Whenever a new Edition is created, it will contain all of the Update information for the previous Edition. Each new Edition or Update also includes a revised copy of this documentation history page.

Edition1 ............................................January, 1990

Edition2 ...............................................July,1992

Edition3 .............................................August,1993

Edition4 ............................................October,1994

Edition5 ..........................................November,1995

Edition6 ............................................January,2001

Safety Symbols

Instruction manual symbol affixed to

Instruction manual symbol affixed to product. Indicatesthatthe user must refer to

product. Indicatesthatthe user must refer to the manual for specific WARNING or

the manual for specific WARNING or CAUTION information to avoid personal

CAUTION information to avoid personal injury or damage to the product.

injury or damage to the product.

Indicates the field wiring terminalthat must be connected to earth ground before operating the equipment— protectsagainst electrical shock in case of fault.

WARNING

Alternating current(AC)

Direct current (DC).

Warning. Risk of electrical shock.

Calls attention to a procedure, practice, or conditionthat could cause bodily injury or death.

Frameorchassisgroundterminal—typically connects to the equipment's metal frame.

CAUTION

Calls attention to a procedure, practice, or conditiont hat couldpossiblycausedamageto equipmentor permanent loss of data.

WARNINGS

The following general safety precautions must be observed during all phases of operation, service, and repair of this product. Failure to complywith these precautionsor with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and intendeduse of the product. Agilent Technologies assumes no liability for the c ustomer's failure to comply with these requirements.

Ground the equipment: For Safety Class 1 equipment (equipment having a protective earth terminal), an uninterruptible safety earth ground must be provided from the mains power source to the product input wiring terminalsor suppliedpower cable.

DO NOT operate the product in an explosive atmosphere or in the presence of flammablegases or fumes.

For continued protectionagainstfire,replacethe line fuse(s)only with fuse(s) of the same voltage and current rating and type. DO NOT use repaired fuses or short-circuited fuse holders.

Keep away from live circuits: Operating personnel must not remove equipment covers or shields. Proceduresinvolving the removal of covers or shields are for use by service-trained personnel only. Under certain conditions, dangerousvoltages may exist even with the equipment switchedoff. To avoid dangerouselectricalshock, DO NOTperformprocedures involvingcover or shield removal unlessyou are qualified to do so.

DO NOT operate damaged equipment: Whenever it is possiblethat the safety protection features built into this product have been impaired,either through physical damage, excessive moisture,or any other reason, REMOVE POWER and do not use the product until safeoperation can be verified by service-trained personnel.If necessary, return the productto Agilentfor serviceand repairto ensurethat safety features are maintained.

DO NOT serviceor adjustalone: Do not attempt internalservice or adjustment unlessanother person,capableof rendering first aid and resuscitation, is present.

DO NOT substitute parts or modify equipment: Becauseof the danger of introducingadditional hazards,do not install substituteparts orperform any unauthorizedmodificationto the product.Return the product to Agilentfor service and repairtoensurethat safety features are maintained.

DECLARATION OF CONFORMITY

According to ISO/IEC Guide 22 and CEN/CENELEC EN 45014

Manufacturer’s Name: Agilent Technologies, Inc. Manufacturer’s Address: Basic, Emerging and Systems Technologies Product Generat ion Unit

815 14 Loveland, CO 80537 USA

Declares, that the product

Product Name: 64-Channel Relay Multiplexer Module Model Number: E1460A Product Options: This dec laration includes all options of the above product(s).

Conforms with the fol l owing European Directives:

The product herewithcomplieswith the requirementsof the Low Voltage Directive 73/23/EECand the EMC Directive 89/336/EEC and carries the CE Marking accordingly.

Conforms with the following product standards: EMC Standard Limit

IEC 61326-1:1997 + A1:1998 / EN 61326-1:1997 + A1:1998

CISPR11:1997 + A1:1997 / EN 55011-1991 Group 1, Class A IEC 61000-4-2:1995+A1998 / EN 61000-4-2:1995 4 kV CD, 8 kV AD IEC 61000-4-3:1995 / EN 61000-4-3:1995 3 V/m, 80-1000 MHz IEC 61000-4-4:1995/ EN 61000-4-4:1995 0.5 kV signallines,1 kV power lines IEC 61000-4-5:1995 / EN 61000-4-5:1995 0.5 kV line-line, 1 kV line-ground IEC 61000-4-6:1996/ EN 61000-4-6:1996 3 V, 0.15-80 MHz IEC 61000-4-11:1994/ EN 61000-4-11:1994 1 cycle, 100%

Street S.W.

[1]

Canada:ICES-001:1998 Australia/New Zealand: AS/NZS 2064.1

Safety IEC 61010-1:1990+A1:1992+A2:1995 / EN 61010-1:1993+A2:1995

Canada: CSA C22.2 No. 1010.1:1992 UL 3111-1

Supplemental Information:

[1] The product was tested in a typical configuration with Agilent Technologies test systems.

September 5, 2000

Date Name

Quality Manager

Title

AuthorizedEU-representative: AgilentTechnologiesDeutschlandGmbH, Herrenberger Straβe 130, D 71034 Böblingen, Germany

For further information, pleasecontactyour local Agilent Technologiessales office,agentor distributor.

Revision: A.03 Issue Date: 09/05/00

Notes:

Using This Chapter

This c hapt er des cribes the E1460A 6 4-Channel Relay Multiplexer module, shows how to connect external wiring, and shows how to get started programming the module using Standard Commands for Programmable Instruments (SCPI). This chapter includes:

• MultiplexerDescription...............................11

• ConfiguringtheMultiplexer............................15

• Configurin g Terminal Modules . . .......................23

• ProgrammingtheMultiplexer..........................29

Multiplexer Description

The E 1460A is a VXIbus C-Size register-based product that provides switching (multiplexing) of up to 64 two-wire channels. Switching consists of connecting a channel’s HI and/or LO line to COM in that bank. The multiplexer can operate in a C-Size VXIbus mainfram e using a comm and module (such as an E1406A Command M odule).

Chapter 1

Getting Started

Multiplexer

Components

The E 1460A 64-Channel Relay Multiplexer module cons ists of a relay switch card and a sta ndard screw-typeterminalmodule. The E1460A is also available with Option A3E that provides a crim p-and-insert terminal housing andconne ctors. Various configurations canbe set byprogramming (closing) certain switch card relays, and/or selection of wire jumpers on the relay switch card and termina l module.

The E1460A is used when high switch densities such as wire harness/cable testing, semiconductor testing, and/or printed-circuit board t es ting is required. Although it is primarily a dual 32-channel two-wire multiplexer, themodulecan be configured to perform one-wire, two-wire, three-wire, and four-wire func tions.

By us ing switch card wire jumpers, the banks can be changed from 1x32 to groups of 1x16 or 1x8. See "Configuring the Switch Card Wire J umpers" for m ore informat ion.

For a SCPI en vironment, one or more multiplexer mod ules ca n be defined as a switchbox or as a scanning multimeter. For a switchbo x configuration, all m ultiplexer channels within the instrument ca n be addres sed usin g a single interface addres s . For a scanning multimeter configuration, both the multimeter and all multiplexer modules within the instrument can be addressed using a single interf ace address.

Chapter 1

Getting Started 11

Channel Relay

Switches

The c hannel relay switches are separated into eight banks. Each bank has eight switchable channels and a COM channel. Each channel has a separate HI (H) and LO (L) line. See Figure 1-1 for a block diagram.

SWITCHCARD TERMINAL CARD

CH 0992

CH 0994

OPEN

CLOSED

CH 0990

OPEN

CLOSED

CH 0991

JM1

CH 0995

JM2 JM3

JM10

JM11

COM

L H

CH 0

BANK 0

CH 7

COM

L H

CH 0

BANK 1

CH 7

L H

COM

L H

CH 0

BANK 2

CH 7

JM13JM12

L H

COM

L H

CH 0

CH 7

CABLE T 1W LO REF H1(1W HI COM) L1(1W LO COM)

H1 L1 G

ANALOG BUS

BANK 3

H2 L2 G

COM

CH 0

CH 7

L H

COM

L H

CH 0

CH 7

L H

COM

L H

CH 0

CH 7

COM

L H

CH 0

CH 7

CH0996

CH0993

JM4

JM5

JM14

JM15

JM16 JM17

Figure 1-1. E1460A Multiplexer Block Diagram

BANK 4

BANK 5

BANK 6

BANK 7

12 Getting Started

Chapter 1

Banks are arranged as follows:

• Bank 0 includes channels 00 throug h 07 and COM

• Bank 1 includes channels 10 throug h 17 and COM

• Bank 2 includes channels 20 throug h 27 and COM

• Bank 3 includes channels 30 throug h 37 and COM

• Bank 4 includes channels 40 throug h 47 and COM

• Bank 5 includes channels 50 throug h 57 and COM

• Bank 6 includes channels 60 throug h 67 and COM

• Bank 7 includes channels 70 throug h 77 and COM

Each c hannel is switched (connec ted to its common) by closing the appropriate (latching) relays . Chan nels 0 through 7 can be switched to COM for all banks. Any number of channels in each bank can be connec ted to com mon at a time (except for one-wire mode).

User inputs/outputs to ea ch channel are via wire terminal s. When a channel is closed, it is internally c onnected to the COM terminal. When a chan nel is opened, it i s internally disconnected. Open channels are not terminated.

At power-on or reset , all channels are switched open (non-te rmina ted ) for all banks only when using the SCPI or C-SCPI driver. At power-off, all relays remain in their present state.

Control Relays In addition to the channel switching relays, the switch card contains seven

control relays (numbered 0990 to 0996). These relays switch the COM lines of banks dependent on the mode selected. All relays are automatically selected when the m odule is conf igured for the desired mode, when using the

[ROUTe:]FUNCtion <

card_number>

, <

function>

command.

For the s tand -a lone switchbox configuration, this command must be used in conjunction with the following comm ands. If you only use and

[ROUTe:]CLOSe

be closed with the

[ROUTe:]SCAN:MODE mode [ROUTe:]SCAN:PORT [ROUTe:]SCAN channel_list

For the scanning multimeter configuration,

card_number

INITiate or MEASure multimeter commands closes t he appropriate control relays. See Chapter 3 in this manual and Chapter 5 in the E1326B/E1411B User’s Manual for more informat ion about these commands. Table 1-1 shows t he c ont ro l relay functions.

commands, the appropriate control relays must also

>, <

function

command.

[ROUTe:]FUNCtion

in c onjunct ion with the CON Figure and

[ROUTe:]OPEN

Chapter 1

Getting Started 13

Table 1-1. Control Relay Functions

Basic Operating

Modes

Control

Relay

0990 Selects H I or LO terminal for one-wire switching. 0991 Connects Cable Test or one-wire LO REF terminal to the

one-wire LO COM terminal. 0992 Connects lower 32 channels (banks 0 - 3) to analog bus. 0993 Connects upper 32 channels (banks 4 - 7) to analog bus. 0994 Connects lower and upper analog buses together. 0995 Connects lower and upper common buses together

(64-channel, two-wire operation). 0996 Connects analog bus Guard to the LO line, on th e upper

32 channels (banks 4 t o 7).

The E 1460A us es the channel and control relays on the switch card to perform fo ur basic operating modes: one-wire, two-wire, three-wire, or four-wire as shown. Co nnec tions to the analog bus (for multimeter connection) are provided on both the relay switch card and terminal module.

Function

One-wire Mode Switches either the HI o r LO terminal of a channel in banks 0 through 7 to

the on e-wire HI COM terminal. One-wire LO COM is switched to the one-wire LO REF termi nal. Only one channel can be switched (closed) at a time. A maximum o f 128 one-wire channels can be switched. through all c hannel relay lows. Then, control relay 0990 switches and goes through all channel relay highs.

SCAN

goes

SCAN

Two-wire Mode Switches both the HI and LO terminals of a channel in banks 0 through 7

Three-wire Mode Switches both the HI and LO terminals of a channel i n bank s 0 through 3

Four-wire Mode Switches both the HI and LO terminals of a c hannel in banks 0 through 3

14 Getting Started

to the HI COM and LO CO M terminals. A maximum of 64 two-wire channels can b e switched.

to the H I COM and LO COM terminals. This mo de also switches the LO terminal of the pair channel in banks 4 through 7 to the LO COM terminal. In addition, the low terminal of the pai r channel in banks 4 through 7 can be connected to the analog bus Guard terminal. Banks are p aired 0/4, 1/5, 2/6, and 3/7. A maximum of 32 three-wire channels can be switched.

to the H I COM and LO COM terminals. Also switc hes the HI and LO terminals of the pair channe l in banks 4 through 7 to the HI COM and LO COM terminals. Banks are paired 0/4, 1/5, 2/6, and 3/7. A maximum of 32 four-wire channels can be switched.

Chapter 1

Configuring the Multiplexer

This sec tion gives guidelines to configure the relay switch card. See "Configuring Terminal Modules" for guidelines to configure the t erminal modules. This section includes:

• Warnings and Cautions

• Setting the Logical Address Switch

• Setting the Status Regist er Switch

• Setting the Interrupt Priority

• Configuring the Switch Card Wire Jumpers

• Installing the Multiplexer in a Mainframe

• Connect ing the Ana log Bus

Warnings and

Cautions

WARNING SHOCK HAZARD. Only service-trained personnel who are

aware of the hazards involved should install, remove, or configure the multiplexer. Before you re move any installed module, disconnect AC power from the mainframe and from other modules that may be connected to the multiplexer.

WARNING CHANNEL WIRING INSULATION. All channels that have a

common connection must be insulated so that the user is protected from electrical shock in the event that two or more channels are c onnected together. This means wiring for all channels must be insulated as though e ach channel carries the voltage of the highest voltage channel.

CAUTION MAXIMUM INPUTS. The maximum voltage that can be applied to any

terminal i s 220 Vdc/2 50 Vrms. The maximum current that can be applied to any te rminal is 1A at 30 Vdc/Vrms, or 0.3 A at 250 Vdc/Vrms. The maximum power that can be applied to any terminal is 40 VA.

CAUTION STATIC E LECTRICITY. Static electricity is a major caus e of com ponent

failure. To prevent damage to the electrical c omponents in the multiplexer, observe anti-static techniques whenever removing a module from the mainframe or whenever working on a module.

Chapter 1

Getting Started 15

Setting the Logical

Address Switch

NOTE The address switch s elected v alue m ust be a multiple of 8 if the module i s

Plug-in modules installed in an mainframe or used with a command module are treated as independent in strum ents each having a unique secondary GPIB address. Each instrument is also assigned a dedicated error queue , input and output buf fers, status registers and, if applicable, dedicated mainframe/command module memory sp ac e for readings or data. An instrument may be compo se d of a s ingleplug -in module (such as a counter) or multipl e plug-in module s (for a switchbox or scanning multimeter instrument).

The in strument logical address (LADDR) is set with the logical address switch located on the instrument. The logical address switch (LADDR) factory setti ng for the E1460A is 112. Valid address values are from 1 to 255. See Figure 1-2 to set the logical address. From Figure 1-2, note that the value of the logical address set is th e sum of the values of the sw itches set to the CLOSED position.

the first module in a switchbox used with a VXIbus command module and being instructed by SC PI commands.

Logical Address = 112

0=OPEN

1=CLOSED

412

16+32+64=112

CLOSED = Switch Set To 1 (ON)

OPEN = Switch Set To 0 (OFF)

Figure 1-2. Setting the Logical Address Switch

Logical Address

Switch Location

16 Getting Started

Chapter 1

Setting the Status

Four bit s o f the Status Register (bits 10-13) define whether the multiplexer module is set for one-wire, two-wire, three-wire, or four-wire switching. To ensure proper operation, set the status register switch as shown in Figure 1-3.

010

0 0 0

1 0 0

10 010

1-wire, 128-channel

2-wire, 64-channel

2-wire, Dual 32-channel

1 1

3-wire, 32-channel 4-wire, 32-channel

Example shows switch set to 4-wire

Setting the Interrupt

Priority

Status Register

Switch Location

Figure 1-3. Se tting the Status Register Switch

The multiplexer module generates an interrupt after a channel has been closed. These interrupts are sent to, and acknowledgmen ts are received from, the command module (such as an E1406A) via the VXIbus backplane interrupt lines.

For most applicat ions where the multiplexer module is installed in a C-Si ze mainframe, t he interrupt priority jum per does not have to be moved. This is because the VXIbus interrupt lines hav e the same priority, and interrupt priority is established by installing modules in slots numerically closes t to the command module. Thus, slot 1 has a higher priority than slot 2, slot 2 has a higher priority than slot 3, etc.

See Figure 1-4 to change the interrupt priority. You can select eightdifferent interrupt priority levels. Level 1 is the lowest priority and Level 7 is the highest priority. Level X disables the interrupt. The module’s factory setting is Level 1. To change, rem ov e the 4-pin jumper from the o ld priority location and reinstall in the new priority location. If the 4-pin jumper is not used, the two jumper locations mus t have the same interrupt priority level selected.

Chapter 1

Getting Started 17

NOTE The interrupt p riority jumper MUST be installed in position 1 when using the

E1406 command module. Level X interrupt priority should not be used under normal operating conditions. Changing the priority level jumper is not recommended. Do not change unless specifically instructed to do so.

Using 4-Pin

Q R

Jumper

Using 2-Pin

Jumper

Interrupt

Priority

Location

Configuring the

Switch Card Wire

Jumpers

NOTE It is only necessary to change the wire jumpers when reconfiguring the

Figure 1-4. Setting the Interrupt Priority

The relay switch card has thirteen factory-installed wire jumpers (see Figures 1-1 and 1-5) that connect COM lines of banks together to form dual 1x 32 channel configurations. These wire jumpers can be changed to reconfigure the switc h card to various 8-channel or 16-channel configurations.

switch c ard for groups of eight or 16 channels (from 32). DO NOT CHANGE the wire jumper pos itions unless instructed to do so in the applicable operating procedures.

18 Getting Started

Chapter 1

Wire Jumper Functions With the ex c epti on of JM1, wire jumpers are changed in pairs. Functions of

the wire jumpe rs are:

• JM1: Used during cable test (see Chapter 2)

• JM2/JM3: Used to connect the COM lines of bank pairs 0/1 and 2/3

• JM4/JM5: Used to connect the COM lines of bank pairs 4/5 and 6/7

• JM10/JM11: Used to conne ct the COM lines of banks 0 and 1

• JM12/JM13: Used to conn ec t the COM lines of banks 2 and 3

• JM14/JM15: Used to conn ec t the COM lines of banks 4 and 5

• JM16/JM17: Used to conn ec t the COM lines of banks 6 and 7

Jumper Location

Reconfiguring the Relay

Switch

Chapter 1

Figure 1-5. Switch Card Wire Jumper Settings

To reconfigure the relay switch card:

1 Position the switch card on a flat surface. Using a TORX T-10 driver,

remove the six screws on the shield and carefully lift the shield to expose the printed circuit board.

2 Configure the wire jump ers as required using Table 1-2. If you install

new jumpers, us e z ero-ohm resistors or No. 22 AWG copper wi re. For ex ample, to configure banks 0, 1, 2, and 3 as 1x8 multipl exe rs

and banks 4, 5, 6, and 7 as 1x16 multiplexers, jumper positions are: Jumpers = JM14,15,16,17 and No Jumpers = J M2,3,4,5,10,11,12,13.

3 Replace the shield and re-install th e six screws.

Getting Started 19

NOTE When wire jumpers J M10 through JM17 are removed, the odd-numbered

banks can no longer be connec ted to the analog bus. For ex ample, if JM10 and JM11 are removed, then bank 1 can no longer be connected to the analog bus termi nals (excep t through user wiring).

When wire jumpers J M2 through JM5 are removed, banks 2/3 and 4/5, respectively, can no longer be con nec ted to the analog bus. For example, if JM 2 and JM3 are removed, then banks 2 and 3 can no longer be connected to the analog bus terminals (except through user wiring).

Table 1-2. Jumper Configurations

Bank Number = Jumper

Configuration

JM Number ( 0 = Jumper, 1 = No Jumper)

Bank0Bank1Bank2Bank3123451011121314151617 1x32*1x32*1x32*1x32* -00- -0000- - - 1x16 1x16 1x16 1x16 -11- -0000- - - 1x8 1x8 1x8 1x8 -11- -1111- - - 1x8 1x8 1x16 1x16 -11- -1100- - - 1x16 1x16 1x8 1x8 -11- -0011- - - -

Bank Number = Jumper

Configuration

JM Number ( 0 = Jumper, 1 = No Jumper)

Bank4Bank5Bank6Bank7123451011121314151617 1x32*1x32*1x32*1x32* - - -00- - - -0000 1x16 1x16 1x16 1x16 - - -11- - - -0000 1x8 1x8 1x8 1x8 - - -11- - - -1111 1x8 1x8 1x16 1x16 - - -11- - - -1100 1x16 1x16 1x8 1x8 -- -11- - - -0011

* factory setting

20 Getting Started

Chapter 1

Installing the

Multiplexer in a

Mainframe

Set the extraction levers out.

Extraction

Levers

The E 1460A c an be installed in any slot (except slot 0) in a C-Size VXIbus mainframe. See Figure 1-6 to install the multiplexer in a mainframe.

Slide the multiplexerinto any slot

(except slot 0) until the backplane connectors touch.

Tightenthe top and bottom screws to secure the multiplexer to the mainframe.

To remove the multiplexer from the mainframe, reverse the procedure.

Seat the multiplexer into the mainframe by pushing in the extraction levers.

Chapter 1

Figure 1 -6. Installing the Multiplexer in a VXIbus Mainframe

Getting Started 21

Connecting the

Analog Bus

NOTE The analog bus can al so be wired to the terminal module. See "Standard

Figure 1-7 shows how to connect the analog bus between multiple multiplexer modules and to the E1411B multimeter. Use cable (part number E1400-61605) to connect the analog bus to all t he modules.

Terminal Module Description" for more information.

Multimeter Module

Command Module

or VXI Controller

22 Getting Started

Daisy-Chain Cables

(E1400-61605)

Multiplexer Modules

Figure 1-7. Analog Bus Cable Connections

Chapter 1

Configuring Terminal Modules

The E 1460A 64-Channel Relay Multiplexer cons ists of a relay switch card and a ( s tan dard) screw-type terminal module or a crim p-and-insert terminal module (Option A3E). See Figure 1-10 for t he mul ti plexer’s connec tor pin-out that mates to the terminal module.

Standard Terminal

Module Description

Figure 1-8 shows the standard screw-t ype terminal module connectors and associated banknumbers, ch annel num bers , an d line designations. Use the following guidelines for wiring connections:

• Be sure that wires make good connections on screw terminals.

• Maximum term inal wire size is No. 16 AWG. When wiring all

64-channels, a smaller gauge wire (20-22 AWG) is recommended.

• Wire ends shou ld be stripped 6mm (0.25 in.) and tinned to

prevent single strands from shorting to adjacent t ermi nals.

Bank 0-3 T erminals

Analog Bus Terminals

Terminal Module

Option A3E

Description

Chapter 1

Bank 4-7 T erminals

Analog Bus Terminals

1-Wire Terminals

Figure 1-8. Standard Screw-type Terminal Module

Terminal m odule Option A3E (see Figure 1-9) provides a crimp-and-insert terminal module that allows you to crimp connectors onto wires which are then i ns erted directly into the multiplexer’s mating connector. See the pin-out diagram(Figure 1-10) to make the connections. Table 1-3 shows the accessories that can be used with crimp-and-insert Option A3E.

Cable Test Terminal

1-Wire Low Ref Terminal

Getting Started 23

Figure 1-9. Option A3E Crimp-and-Insert Connector

Table 1-3. Option A3E Terminal Module Accessories

Accessory Description Picture Specifications

SingleConductor and Contact

ShieldedTwisted-Pair and Contacts

Jumper Wire and Contacts

Crimp-andInsert Contacts

A crimp-and-insert contact i s crimped onto one end of a wire. The other end is not terminated. O rd er 91510A.

A crimp-and-insert contact i s crimped onto each conductor at one end of a shielded-twisted-pair cable. The other end is not termina ted. Order 91511A.

A crimp-and-insert contact i s crimped onto each end of a s ingle conductor jumper wire. This jum per is typically used to t ie tw o pins together in a single crimp-and-insert connector. Order 91512A.

These contacts m ay be c rimped onto a conductor and then inserted into a crimp-and-insert connector. The crimp tool k it is required to crimp the contacts ont o a conductor and remove the contact from the connector. Order 91515A.

Length: 2 meters Wire Gauge: 24 AWG Quantity: 50 each

Insulation Rating: 105 Voltage: 300 V

Length: 2 meters Wire Gauge: 24 AWG Outside Diameter: 0.1 inches Quantity: 25 each

Insulation Rating: 250 Voltage: 600 V

Length: 10 cm Wire Gauge: 24 AWG Quantity: 10 each

Insulation Rating: 105 Voltage: 300 V

WireGaugeRange: 20-26AWG Quantity: 250 each Plating: Gold Plated Contact

Maximum Current: 2A at 70

Cmax

Crimp-andInsert Tools

The hand crimp tool (part number 91518A) is used for crimping contacts onto a conductor. The pin ex tract or tool (part number 91519A) is required for removing contacts from the crimp-and-insert connector. These products are not included with Option A3E or with the

terminal option accessories listed earlier.

Extra Crimp-and-

The c rim p-and-insert c onnec t or is normally supplied with Option A3E. Contact Agilent if

additional connectors are needed. Order 91484B. Insert Connectors

24 Getting Started

Chapter 1

Connecting User

Inputs

Figure 1-10 shows the front panel of the E1460A and the multiplexer’s connector pin-out which mates to the te rminal mod ule. Actu al user inputs are connected t o the terminal module. See "Wiring Terminal Module s" for connection information.

Chapter 1

Figure 1-10. E1460A Multiplexer Pin-Out

Getting Started 25

Wiring Terminal

Modules

Figures 1-11 and 1-12 show sugges t ed steps to connect field wiring (user inputs) to a terminal module.

Remove Clear Cover

Make Connections

Screw-Type

A. Release Screws B. Press Tab Forward

and Release

Tab

Use wire

Size 16-26

AWG

VW1 Flammability

Rating

5mm

0.2"

Remove and Retain Wiring Panel

Crimp-and-Insert

Remove 1 of the 3

wire exit panels

Use wire

Size 22-26

AWG

2.5mm

0.1"

Insert wire into terminal. Tightenscrew.

InstallConnectors (Crimp-and-Insert)4

Route Wiring5

Tighten wraps to

secure wires

Figure 1-11. Steps to Wire Terminal Modules

Continued on next page

26 Getting Started

Chapter 1

Replace Wiring Panel

Cut required

holes in panels

for wire exit

Keep wiring panel exit hole as small as possible

ReplaceClear cover

A. Hook in the top cover

tabs onto the fixture.

B. Press down and

tighten screws

Installon Multiplexer8

Push in the Extraction Levers to Lock the

Terminal Module onto the Multiplexer

Extraction

Levers

Chapter 1

Figure 1-12. Steps to Wire Terminal Modules (continued)

Getting Started 27

Attaching Terminal

Modules to the

Multiplexer

Extendthe extractionleverson the1 terminal module.

Extraction Lever

Use small screwdriver

to release the two

extractionlevers

Figure 1-13 shows how to attach a terminal module to the multiplexer and how to rem ov e a terminal module from the multiplexer.

ExtractionLever

Align the terminal module connectors to the multiplexer connectors.

Applygentlepressuretoattach the terminal module to the multiplexer.

Push in the extraction levers to lock th e terminalmodule onto the multiplexer.

Extraction

Levers

To remove the terminal module from the multiplexer, use a small screwdriver to release the two extraction levers and push both levers out simultaneously to free it from the multiplexer.

Figure 1-13. Attaching a Terminal Mo dule to the Multiplexer

28 Getting Started

Chapter 1

Programming the Multiplexer

The multiplexer m odules are programmed using either a switchbox or scanning multimeter configuration. To program the multiplexer modules using SCPI commands, you must choose the controller language, interface address, and SCPI c ommands to be used . Guidelin es to choose SCPI commands for the multiplexer follow.

NOTE This discus s ion appl ies only to SCPI programming. See Appendix B -

Checking SCPI

Drivers

What are SCPI Device

Drivers?

Checking the SCPI Driver

Revision

The E 1460A operates with Switchbox D river Revision A.08. 03 or later or with Scanning Voltmeter Driver Revision A.06.03 or later. The E1460A may be recognized by e arlier driver revisions, but will not operate properly. Before us ing the E1406A, you sh ould check your driver revision and, if necessary, load a new driver.

This procedure shows a way to download SCPI drivers to the E1406A. SCPI Instrument Drivers and the VXI Installation Consultant (VIC) are on the Agilent Technologies Universal Instrument Drivers CD. For the latest information on drivers, see the Agilent web s ite:

http://www.agilent.com/find/inst_drivers

Agilent register-based modules are supported by Standard Commands for Programmable Ins trument s (SCPI) drivers. These drivers reside in E1406A Command Module non-volatile memory. If you add a new register-based module to an exist ing VXI system and pla n to program the module using SCPI, t he firmware in your command mo dule m ay nee d to be upgraded to accommodate the new module. You can download new drivers into non-volatile m emory from controlle rs running Windows, BASIC, or IBASIC.

This procedure describes how to decide which E1460A driver to use, how to check the curren tly installed driver, and how to determine if you need to downloada new driver. If you determine that you need to install anew driver, see "Do wnloadi ng a New Driver".

Chapter 1

Decide whether t o use the VOLTMTR or SWITCH driver. Use the

VOLTMTR driver if you intend t o use the E1460A in combinati on with the E1326B or E1411B multimeter in a Scanning Voltmeter configuration. In this configuration, the E1460A s ca ns meas urement channels and sends the signals to the multim eter where the measurements take place. Use the SWITCH driver for all other applications (all non-Scanning Voltmeter applications).

2 Check the currently installed driver revision numbers by sending the

DIAG:DRIV:LIST? command to the command modu le (the command module is usually at GPI B add ress 70900). A typical result follows. The s pec ific resu lt depends on the specific drivers previously loaded into your command module.

Getting Started 29

SYSTEM,E1406A,A.08. 00,ROM;IBASIC,IBASIC,A.O4.02,ROM ; VOLTMTR,E1326B,A.06.00,RO M;S WITCH,SWITCHBOX,A.07.00,ROM; COUNTER,E1332A,A.04.02 ,ROM;E1333A,A.04.02,ROM; DIG_I/O,E1330A,A.O4.03,ROM;D/A,E1328A ,A.04.02,ROM

3 Determine whether to install a new driver. The E1460A requires a

SWITCH Driver Revision of A.08.03 or later or a VOLTMTR Driver Revision A.06.03 or later. In the exa mpl e response ab ov e, the currently installed drivers are:

VOLTMTR,E1326A,A.06.0 0,RO M SWITCH,SWITCHBOX,A.07.00,ROM

In this example, you must downloa d a new SWITCH or VOLTMTR driver (depending upon which driver you chose in Step 1).

Downloading a New

Driver

NOTE If you are updating an already installed driver, the new driver must be

Multiplexer

Addressing

To downloada new driver, choos e your operating system and interfacefrom the follo wing list and follow the related instructions.

Windows via GPIB or RS-232. (For the fastest download, use GPIB rather

than RS-232.) Use the VXI Installation Consultant (VIC). VIC is a hardware installation program that helps you configure and install VXI instruments and can a lso download DOS-formatted instrument drivers. VIC downloads driversduring the configuration process and stores a copy of the driverin the

C:\VIC\DRIVERS directorytheF IRST TIME theinstrument isconfigured.

downloaded using the VIC Driver Download utility. Instructions f or using VIC and its Driver Download utility are contained in VIC’s on-line help.

All other operating systems/interfaces. See the Installing SCPI Device

Drivers Insta llation Note (shipped with the downloadable drivers).

To address specific channels within a multiplexer modulein either switchbox or scanning multimeter configuration, you m us t end the appropriate SCPI command string to the switchbox or scanning mul timeter (for example,

CLOSe,OPEN

, etc .) and specify the specific channel add re ss.

SCPI Commands Format You can send SCP I commands in either short or long form. A long form

example is case l etters is the short form. The command then becomes

Some c ommands are shown with brackets ([ ]). These are implied commands that you do not need to exec ute. The bracket s are not part of the co mm and and are not sent to the instrument.

For example, the here as can j us t enter SCPI commands and how to send them.

30 Getting Started

CLOSe(@123)

ROUTe

[ROUTe:]CLOS(@123)

CLOS(@123)

. The same co mm and shown w ithout the lowe r

command is an implied command and is shown

. See Chapt er 3 for more information about

CLOS(@123)

. Thus, to exe cu te these commands, you

Chapter 1

Multiplexer Card

Numbers

The multiplexer c ard number identifies the module within a switchbox or scanning multimeter configuration. The card number ass igned depe nds on the conf iguration. Leadi ng ze roes can be ignored for the card number.

Switchbox Configuration. In a single-module switchbox configuration, the

card number is always 01. In a multiple-module switchbo x configuration, multiplexer modules are s et to successive logical addresses. The multiplexer module with the lowest logical address is always card number

01. T he ca rd number with the next successive logical address is 02, etc.. See F igure 1-14 for card numbers and logical addresses of a typical multiple-module switchbox configuration.

Multiple-Module Switchbox Card Numbers

Command

Module

Card Number 01

Card Number 02

Card Number 03

218

Note: Physical placement of the Module in the Logical Address

order is not required, but is recommended.

Multiplexer Module

Logical Address = 112

Secondary Address = 14

Multiplexer Module

Logical Address = 113

Multiplexer Module

Logical Address = 114

Figure 1-14. Card Numbers in a Multiple-Module Sw itchbox

Scanning Multimeter Configuration. In a multiple-module scanning

multimeter configuration, modules are assigned successive logical addresses beginning with the multimeter. The multimeter module is always card number 00, the multiplexer mod ule withthe n ex t lowes t logical address is a lways card number 01, the next successive logical address is card number 02, etc. See F igure 1-15 for card numbers and logical addresses of a typical multiple-mo dule sc anning m ultim eter configuration.

Chapter 1

Getting Started 31

Multiple-Module Scanning Multimeter Card Numbers

Command

Module

Figure 1-15. Card Numbers in a Multiple-module Scanning Mult imeter

Multiplexer Channel

Addresses

Card Number 00

Card Number 01

Card Number 02

Note: Physical placement of the Module in the Logical Address

order is not required, but is recommended.

HP E1411B Multimeter

Logical Address = 24

Secondary Address = 03

8 2 1

Multiplexer Module #1

Logical Address = 25

8 2 1

Multiplexer Module #2

Logical Address = 26

8 2 1

For the E1460A, the chann el address (channel_list) has the form: (@ssbc) for two-wire, three-wire, and four-wire operating mode s

(@ss0hbc) for one-wire operating mode (@ss099c) for control relays (all operating modes)

where

ss = c ard number (01-99) 0h = LO or HI terminal (0-1) b = b ank number (0-7) c = number 0-7 for switching relays or 0-6 for control r elays

Channeladdressescan be specified in t he following forms. The leading zero in the card number ca n be ignored.

One-wire mode only

(@ss0hbc) for a single ch annel; (@ss0hbc,ss0hbc) for multiple channels; (@ss0hbc:ss0hbc) for sequential channels; (@ss0hbc:ss0hbc,ss0hbc:ss0hbc) for groups of sequential channels or any combinat ion of the above.

Two-wire, three-wire, or four-wire modes (and control relays) where b = 099

(@ssbc) for a single channel; (@ssbc,ssbc) for multiple channels; (@ssbc:ssbc) for sequential channels; (@ssbc:ssbc,ssbc:ssbc) for groups of sequential channels; or any combinat ion of the above.

32 Getting Started

Chapter 1

Low or High Terminal Number

The LO or HI terminal number is specified for one-wire mode only and identifies what terminal wi ll be used during one-wire switching. This number can be omitted w hen the low terminal is the desired selection. Only valid terminals can be accessed in a channel list .

isspecifiedtousetheLO(L) terminal of the bank and chann el selected . Defaults to LO terminal if not entered. 01 is spec ified to use the HI (H) terminal of the bank and channe l selected.

Bank Number

The bank number ident ifies w hat ban k of eight channels will be affected during switc hing. The bank numbers are 0 to 7 for one-wire and two-wire modes and 0 to 3 for three-wire and four-wire modes. Only valid banks can be accessed in a channel l ist. Closing, opening, or querying banks 4 to 7 when operating in three-wire and four-wire modes will generate an error.

Channel Number

The c hannel number identifies what channel will be switched to its COM terminal. Channel num bers are 0 to 7. Only valid c hannels can be accessed in a channel list. When switching the control relays, the channel number (0 to 6) identifies which control relay will be s w itch ed (see Figure 1-1).

Examples: M ultiplexer

Module Channel List

One-wire oper ating m ode:

CLOSe (@10173)

Two-wire operating mode:

CLOSe (@173,176)

Three-wire operating mode:

CLOSe(@133:136)

Four-wire operating mode:

CLOSe(@133:136,233:236)

!Connect card 01, bank 7, channel 3 HI terminal to the one-wire HI COM terminal

!Connect card 01, bank 7, channels 3 and 6 H I and LO terminals, to bank 7 HI and LO COM terminals

!Connect card 01, bank 3, channels 3 through6 HIa nd LO terminals, tobank 3HI and LO COMtermina ls. Also connect bank 7, channels 3 through 6 LO terminal, to bank 7 LO COM terminal.

!Connect cards 01 and 02, bank 3, channels 3 through 6 HI and LO terminals, to bank 3 HI and LO COM terminals. Also, connect bank 7, channels 3 through 6 HI and LO terminals, to bank 7 HI and LO COM terminals.

Chapter 1

Control relays:

CLOSe (@10995)

!Connect the upper and lower 32 channels together f or a 64-channel two-wire multiplexer

Getting Started 33

Initial Operation You can us e th e following example program to verify initial multiplexer

module operation by closing a channel and querying channel closure. The example first reset s the switchbox an d then closes bank 0, channel 2 of a single multiplexer m odule (card number 1) in the switchbox.

The program next queries the channel closure state. A returned "1" shows that the command to close the chan nel has been sent to the switchbox. A ret urned "0" shows tha t the command to close the channel has not been sent to the switchbox.

BASIC is used as the program language. The comput er inte rfaces to the mainframe us ing G PIB with interface select code 7, primary address 09, and secondary address 14. This example rsesets the swi tchbox and closes card 0 1 bank 0 channel 2 (to COM).

10 OUTPUT 70914;"RST" 20 OUTPUT 70914;"CLOS(@102)"

30 OUTPUT 70914;"CLOS? (@102)" 40 ENTER 70914;Value 50 PRINT Value 60 END

!Reset the m odule, set all relays to open !Connect bank 0 channel 2 HI and LO

terminals t o bank 0 to COM HI and LO

terminals !Query channel 02 !Enter results into Value !Display results (should retu rn "1")

34 Getting Started

Chapter 1

Using the Relay Multiplexer

Using This Chapter

This c hapter sho w s how to use the Relay Multiplexer module, including:

• MultiplexerCommands/States........................ 35

• Sw itching C hannels . . . ..............................37

• ScanningChannels .................................43

• Mis ce llaneous Multiplexer Functions . . . ................ 51

Multiplexer Commands/States

This sec ti on summ arizes R elay Multiplexer module comm ands , q ueries, and reset sta tes. Table 2-1 shows m ultiplexer com mands u se d in this chapter. See Chapter 3 for add itional information about the commands.

Table 2-1. Selecte d Multiplexer Com m and s Used in Chapter 2

Chapter 2

Command Description

INITiate[:IMMediate]

OUTPut:TTLTrgn[:STATe] ON

OUTPut:EXTernal][:STATe] ON

[ROUTe:]CLOSe <

[ROUTe:]CLOSe? <

[ROUTe:]FUNCtion <

card_number

[ROUTe:]OPEN <

[ROUTe:]SCAN <

[ROUTe:]SCAN:PORT

[ROUTe:]SCAN:MODE

TRIGger:SOURce <

*CLS

*ESE

*RST

channel_list

>,<

function

channel_list

source

Starts the scan sequence and closes the first channel in the channel_list. Enables selected output to trigger pulses from t he TTL Trigger bus line specified. Enables selected output to trigger pulses from command module’s "Trig Out" port. Closes the channels in the channel_list.

Queries the state of the closed channels in the channel_list. Sets the operating mode to one-wire, two-wire, three-wire, or four-wire.

Opens the channels in the channel_list. Defines the channels to be scanned. Channels specified in the channel_list

are closed one at a time. Closes bank COM terminals to the analog bus during a scan. Sets the scan mode to volts, 2-wire ohms, or 4- wire ohms.

Selects the trigger source to advance the scan. Clears all switchbox status registers and error queue. Enables event status register. Resets the hardware and software to a known state.

*SRE

Chapter 2

Enables status register.

Using the Relay Multiplexer 35

Table 2-2 sum marizes the query commands you can use to determine the configuration or state of the multiplexer. All commands put the data int o the output buffer where you can retrieve it to your computer.

Table 2-2. Multiplexer Q uery Comm ands

Command Description Command Description

ARM:COUN?

CLOS?

FUNC?

OPEN?

INIT:CONT?

OUTP:ECLTrgn?

OUTP:EXT?

OUTP:TTLTrgn?

SCAN:MODE?

Parameter Default Description

ARM:COUNt

Number of Scanning Cycles SCAN:PORT? Scanning Port Selected Channel C losed STAT:OPER:ENAB? Status Operation Enable Operating M ode Selected STAT:OPER:EVEN? Status Operation Event Channel O pen SYST:CDES? <number> Module Description Scanning State SYST:CTYP? <number> Module Type ECL Trigger Output State SYST:ERR? System Error External Trigger Output State TRIG:SLOP? Trigger Slope TTL Trigger Output State TRIG:SOUR? Trigger Source Scanning Mode Selected

Table 2-3 lists the p arametersand de fault values for the functions des cribed in this chapter. When the multiplexer is switched on or *RST (reset), all bank channels are set to ope n and the current channel_list for scanning is invalidated.

Table 2-3. Multiplexer Reset Conditions

1 Number of scanning cycles is one

INITiate:CONTinuous

OUTPut:ECLTrgn[:STATe]

OUTPut[:EXTernal][:STATe]

OUTPut:TTLTrgn[:STATe]

[ROUTe:]SCAN:MODE

[ROUTe:]SCAN:PORT

TRIGger:SOURce

OFF Number of scanning cycles is set by ARM:COUNt OFF Trigger output from ECLT sources is disabled OFF Trigger output from external sources i s disabled OFF Trigger output from TTLT sources is disabled NONE Channel list volts/ohms measurements disabled NONE Analog bus port connection disabled IMM Will advance scanning cycles automatically

36 Using the Relay Multiplexer

Chapter 2

Switching Channels

For general purpose switching, you can switch channels (connect or disconnect signal s) in one-wire, two-wire, three-wire, or four-wire operating modes by opening or closing specific channel(s).

NOTE For m ore information, see the [ROUTe:]FUNCtion command. There i s no

need to send the [ROUTe:]FUNCtion command if the status register switch (see "Setting the Status Register Switch") is set to the correct operating mode.

Switching Channels

Comments

Setting Multiplexer Function. Use FUNCtion <card_number>,<function>to

configure the Relay Multiplexe r, where <function>=WIRE1|WIRE2| WIRE2X64|WIRE3|WIRE4.

Opening/Closing Channels. Use CLOSe <channel_list> to close bank

channel(s) and OPEN <channel_list> to open bank channel(s). Channel_list has the form (@s s 0hbc)wheress = card number (00-99), 0h = one-wire mode only HI/LO s w it ch ing (00 or 01), b = bank number (0-7), and c = channel number (0-7).

Opening/Closing Multiple Channels. To close or open m ult iple channels,

place a comma (,) bet ween the channel numbers. To close or open a range ofchannels,place a colon (:)between the channel numbers. You can do this for both single or multiple module switchb ox es . See [ROUTe: ]O PEN and [ROUTe:]CLOSe for additional information.

Querying Open/Closed Channels. The CLOS? <channel_list>andOPEN?

<channel_list> commands determine if the channel in the channel_list is open or closed, respectively. (The query command does not determine if, in the event of a hardware failure, the channel remains open/closed.) See [ROUTe:]OPEN? and [ROU Te:]CLOSe? for additional information.

Switching Control Relays. The control relays 0990 to 0996 can also be

switched using the OPEN and CLOSe commands, provided the FUNCtion command is executed first. See [ROUTe:]OPEN and [ROUTe:]CLOSe for additional information.

Chapter 2

FRES: When operating in one-wire mode, 4-wire resistance measurement

(FRES) is not supported. See the [ROUTe:]SCAN:M ODE comm and fo r additional information.

Analog Bus Connection When Scanning. In all four mode s of operation, the

analog bus can be connect ed during a scan using the SCAN:PORT command. In three-wire mode, the paired bank (4-7) channel LO terminal can be con nec ted to the analog bus Guard terminal. See the [ROUTe:]SCAN:PORT command for addition al information .

Using the Relay Multiplexer 37

Analog Bus Connection When Not Scanning. When opening and closing

individual channels in all four modes of operation, the analog bus can be connected by switching the control relays (0992-0994, 0996) using the OPEN and CLOSe commands. See [ROUTe:]OPEN and [ROUTe:]CLOSe for addi tio nal information.

RelaySwitchCardConfiguration.In all modes of operation the relay switch

cardwire jumpers c an be changed to 1x8or 1x16 configurations asrequired. See “Configuring the Switch Card Wire Jumpers” for additional information.

Switching Channels

Examples

Example: Switching

Channels (One-Wire)

Four example programs follow that illustrate one-wire, two-wire, three-wire, and four-wire modes of operation for switching multiplexer channels. The examples are:

• Exa mpl e: Switch ing Channels (On e-Wire)

• Exampl e: Switch ing Channels (Two-Wire)

• Exampl e: Switch ing Channels (Three-Wire)

• Exa mpl e: Switching Channels (Four-Wire)

This example illus trates one-wire mo de operation. For the example, the HI terminal i s used. Bank 2 channel 1 is closed, connecting the HI terminal to the one-wire HI COM terminal. Figure 2-1 shows how the multiplexer is configured.

For one-wire operation, t he control relays are set as follows. 0990 depends on HI or LO terminal selection. 0991/0995 are set closed. 0992 will close when SCAN:PORT ABUS is selected during a scan (see “Scanning Channels”). 0993/0994/0996 remain in current state (open if not c hanged after *RST)

To connec t the HI terminals of bank 2 channel 1 to the o ne-wire HI COM terminal, execute:

FUNC 1,WIRE1

!Configures t he multiplexer (card 01) for

one-wire operation

NOTE If the status register switch is set to one-wire operating mode, the FUNC

38 Using the Relay Multiplexer

CLOS (@10121)

1,WIRE1 command is not required. When operat ing in the one-wire mode, only one channel at a time can be closed.

!Connects the H I terminal of bank 2 channel

1 to the one-wire HI COM terminal

Chapter 2

SWITCH CARD

Open

Closed

CH0990

CH0995

JM2 JM3

JM5JM4

Open

Closed

CH0991

TERMINAL MODULE

1W H

Cable T

1W L

1W Ref L

COM

CH1

1WireHighCommon

Cable Test

1WireLowCommon

1WireLowRef

Bank 2

Figure 2-1. Example: Switching Ch annels (One-Wire)

Example: Switching

Channels (Two-Wire)

This example illustrates two-wire mode operation. The HI and LO terminals ofbank0 channels 0 and 7 are closed, connecting them to the bank 0 HI and LO COM terminals. Figure 2-2 shows how the multiplexer is configured.

For two-wire operation, the control relays are set as follows. 0990/0991 are opened if using the <channel_list> command with SCAN:PORT ABUS and SCAN:MODE<mode>. Mode can be R ES, VOLT, or NONE. 0990/0991 are left in their present state if mode is FRES. 0992/0993 wi ll close when SCAN:PORT ABUS is selected during a scan (see “Scanning Channels”).

0994/0995/0996 remain in their present state with the following exceptions. 0994 is clos ed in RES mode. If <card_numbe r >, WIRE 2X 64 (2x64 configuration), 0994 is closed in the RES and NONE modes. In the FRES mode, 0994 and 0995 are opened. 0996 clos es and connects C OM to LO for voltage me as urements with the MEASure or SCPI comma nds in a scanning multimeter.

Chapter 2

Using the Relay Multiplexer 39

To connect the HI and LO terminals of bank 0 c hannels 0 and 7 to the bank 0 COM terminals, exec ut e:

FUNC 1,WIRE2

!Configures t he multiplexer (card #1) for

two-wire o peration

CLOS @100,107)

!Connects the HI and LO terminals of bank 0

channels 0 and 7 to bank 0 COM termi nals

NOTE If the Status Register sw itc h is set to the two-wire operating mode, the

FUNC 1,WIRE2 command is no t required. The WIRE2X64 comm and c an be used rather th an clos ing control relay 0995 to configure the card to a single 64-channel multiplexer. (Available only with E140 6A (Switchbox rev. A.06.00 or later)).

SWITCH CARD TERMINAL MODULE

COM

CH0

BANK 0

Example: Switching

Channels (Three-Wire)

CH7

JM11JM10

Figure 2-2. Example: Switching Channels (Two-Wire)

This example illus trates three-wire mode operation. The HI and LO terminals of bank 0 channel 0 are closed, connecting them to the bank 0 COM t erminals. The LO terminal of bank 4 channel 0 is closed, connecting it to the bank 4 LO COM terminal. Figure 2-3 shows how the multiplexer is configured.

Forthree-wire operation, the cont rol relays are setas follows. 0990/0991 are set open when <channel_list> is executed. 0992/0993/ 0996 will close when SCAN:PORT ABUS is selected during a scan. 0992 and 0993 are opened when not SCAN:PORT ABUS (see “Scanning Channels”). 0994/0995 are set open when SC AN <c hannel_list> is executed

40 Using the Relay Multiplexer

Chapter 2

To connect t he HI and LO terminals of bank 0 channel 0 and the LO terminal of bank 4 channel 0 to their COM terminals, execute:

FUNC 1,WIRE3

!Configures t he multiplexer (card 01) for

three-wire operat ion

CLOS (@100)

!Connects the HI and LO terminals of bank 0

channel 0 to the bank 0 COM terminals and the LO terminal of bank 4, channel 0 to the bank 4 LO COM terminal

NOTE If the Status Register s witch is set to three-wire operating m ode, the FUNC

1,WIRE3 command is not required. In three-wire mode, banks are paired 0/4, 1/ 5, 2/6, and 3/7. Do not connect user wiring to the HI terminal in the upper bank pair (4-7), as this terminal is switched during three-wire operation. Upper bank pair (4-7) channels ca nnot be switched or queried while in this mode.

SWITCHCARD TERMINALMODULE

COM

CH0

1IN

2IN 1OUT

2OUT

BANK 0

Example: Switching

Channels (Four-Wire)

CH 0996

COM

CH0

ANALOG BUS GUARD NO CONNECTION

3IN NO CONNECTION

3OUT

BANK 4

Figure 2-3. Example: Three-Wire Mode Channel Switching

This example illustrates four-wire mode operation. The H I and LO terminals of bank 0 channel 0 are closed, connecting them to the bank 0 COM terminals. Atthe same time, the HI and LO terminals of bank 4 channel 0 are closed, connecting t hem to the bank 4 COM terminals. Figure 2-4 shows how the m ult iplexer is configured.

For fo ur-w ire operation, the control relays are set as follo ws . 0990/0991 are set open when SCAN <channel _list> is executed. 0992/0993 will close when SCAN:PORT ABUS is selected during a scan. They are opened otherwise (see “Scanning Channels”). 0994 /09 95/0 996 are set open when SCAN <channel_list> is executed.

Chapter 2

Using the Relay Multiplexer 41

To connect the HI and LO terminal s of bank 0 channel 0 and the HI and LO terminals of bank 4 chann el 0 to their COM terminals, execute:

FUNC 1,WIRE4

!Configures t he multiplexer (card #1) for

four-wire operation.

CLOS (@100)

!Connects the HI and LO terminals of bank

4 channel 0 to the bank 4 COM terminals

NOTE If the Status R egister switch is set to four-wire operat ing mode, the FUNC

1,WIRE4 command is not required. In four-wire mode, banks are paired 0/4, 1/5, 2/6, and 3/7. Upper bank pair (4-7) channels cannot be switched or q ueried whil e in this mode.

SWITCH CARD TERMINAL MODULE

COM

CH0

COM

CH0

1IN

2IN 1OUT

2OUT

3IN

4IN 3OUT

4OUT

BANK 0

BANK 4

42 Using the Relay Multiplexer

Figure 2-4. Example:Four-Wire Mode Channel Switching

Chapter 2

Scanning Channels

Scanning the multiplexer module c hannels consists of c losing bank channel(s) to the resp ective bank COM terminal(s) one channel at a time. Single s can, multiple scans (2 to 32767), or continuous scanning modes are available.

Scanning Channels

Comments

Scanning Channels Sequence. The TRIGger:SOURce com mand spe cifies

the source to advance the scan. The OUTPut comma nd can be used to enable the E1406A Command Module "Trig Out" port, TTL Trigg er bus lines (0-7), or ECL Trigger bus lines (0-1). Figure 2-5 illustrates scanning.

ARM:COUN <number>

TRIG:SOUR BUS|HOLD|EXT|MM|

TTLT|ECLT

OUTP ECLT|EXT|TTLT

OUTP 1|0|ON|OFF

INIT:CONT1|0|ON|OFF

SCAN:MODE

NONE|VOLT|RES|FRES

Chapter 2

SCAN:PORT NONE|ABUS

SCAN <channel_list>

INIT

TRIG

Figure 2-5. Scanning Channels Sequence

Using the Relay Multiplexer 43

Scanning Requirements of a Switchbox (With a Command Module). To scan

modules in a s witc hbox,you must nn ow the card numbers of allthe mo dules to be scanned, sequentially address the modules (for example , logical address 112, 113, 114, etc.), and set the lowest addressed module to a logical address that is a multiple of 8.

Channel List Can Be Extended Across Boundaries. For multiple-module

switchbox instruments, the channels to be scanned can extend across switch modules. For example, for a two-module switchbox ins trument , SCAN (@100:277) will scan all channels of both multiplexer modules.

Setting Multiple Continuous Scans. Use ARM:COUNt < num ber> to set from

1 to 32767 scans. Use INITiate:CONTinuous ON to set continuous scanning.

Control Rel ay Switching. Control relays (0990 to 0996) are not affected by

opening and closing of the channel relays (banks 0 to 7). They are switched when configuring a mode (See "Channel Switching" in this chapter), and during sc anning when SCAN:PORT ABUS is selecte d (see the [ROUTe:]SCAN:PORT comm and for more information).

Two-Wire Ohms Measurements. When making two-wire ohms scanning

measurements using multimeters with SOURCE/SENSE leads, use SCAN:MODE RES. When m ak ing two-wire ohms scanning measurements using multimeters with HI/LO leads, use SCAN:MODE V OLT. See the [ROUTe:]SCAN:MODE command for more information.

Scanning Channels

Examples

Example: Scanning

Channels Using E1406A

Command Module

Some example programs follow that show how to scan channels using the E1406A Command Module and/or external multimeters. The examples are:

• Exa mpl e: Scanning Channels U s ing E1406A Command Module

• Exa mpl e: Sc anning Channels U s ing E1412A Mult im eter

• Exa mpl e: Sc anning Channels U s ing 3457A Multimeter

• Exa mpl e: Scanning Multim eter DCV Measu rements

• Exa mpl e: Scanning Multimeter Resistance M eas urements

This example uses the E1406A Com mand Module TTL Trigger Bus lines to synchronize E1460A multiplexer bank 0 channel 0, to bank 7 channel 7 closures to an E1411B Sys te m Multime ter. For the example, a two-wire ohms measurement is performed.

For measurement synchronization, E1406A TTL Trigger Bus line 0 is used by the multiplexer to trigger the multimeter to perform a measurement. The E 1406A TTLT rigger Bus line 1 is used bythe multimet er to advance the multiplexer scan.

Figure 2-6 shows how to connect the E1460A mul tiplexer module to the E1411B multimeter. This example uses GPIB select code 7, primary address 09, and sec ondary address 03 for the multimeter and GPIB select code 7, primary ad dress 09, and secondary addres s 14 for the multiplexer.

44 Using the Relay Multiplexer

Chapter 2

Command Module

Trig

E1406A

E1411B

Multimeter Module

Ext Trigger

E1460A

Terminal Module

E1460A

MultiplexerModule

Trig

Out

Figure 2-6. Exam pl e: Sca nning Chan nels Using E1406A Com m and Module

10 DIM Readings(1:64)

20 OUTPUT 70903;"*RST"

30 OUTPUT 70903;"CONF:RES AUTO,MAX"

VM Complete

Bank 0 H Com Bank0LCom

!Dimensions computer to store readings !Resets multimeter module to known state !Configures t he multimeter to measure

resistance us ing au torang e at the least accurate res olution (the largest value)

Chapter 2

40 OUTPUT 70903;"TRIG:SOUR TTLT0"

50 OUTPUT 70903;"OUTP:TTLT1:STAT 1"

60 OUTPUT 70903;"TRIG:COUN 64"

70 OUTPUT 70903;"*OPC?"

80 ENTER 70903;Opc

90 OUTPUT 70914;"*RST"

100 OUTPUT 70914;"FUNC 1,WIRE2X64"

110 OUTPUT 70914;"OUTP:TTLT0:STAT 1"

!Multimeter to perfo rm me as urement when

trigger recei ve d on TTL Trigger bus line 0

!Multimeter to cause trigger on TTL trigger bus

line 1 when m eas urement complete !Multimeter to rece ive 64 triggers !Multimeter operations complete !Enters a "1" when complete !Resets the multiplexer to known state !Configures multiplexer for 64 channels and

closes control relay 0995 !Multiplexer to cause trigger on TTL trigger bus

line 0 when channel close com plet e

Using the Relay Multiplexer 45

120 OUTPUT 70914;"TRIG:SOUR TTLT1"

!Multiplexer to advance scan when trigger

received in TT L trigger bus line 1

130 OUTPUT 70914;"SCAN:MODE VOLT"

140 OUTPUT 70914;"SCAN:PORT ABUS"

150 OUTPUT 70914;"SCAN (@100:177)"

160 OUTPUT 70914;"*OPC?"

170 ENTER 70914;Opc

180 OUTPUT 70903;"READ?"

190 OUTPUT 70914;"INIT"

200 ENTER 70903;Readings(*)

210 PRINT Readings(*)

!Sets switc hbox measurement to volt (use d

to mak e 2-wire resistance measurement on

multimeter’s HI/LO terminals) !Closes control relays 992 and 993 connec tin g

the analog bus to the upper and lower four

bank commons !Defines channel list to scan bank 0 channel

0 to bank 7 channel 7 !Multiplexer operations c omplete !Enters a "1" when complete !Places multimeter in wait-for-trigger state.

Will send measurement resul ts to output

buffer w hen triggered. !Closes bank 0 channel 0 and enables the

scan. C aus es a trigger output on TTL Trigger

bus line 0 tha t initiates the multimeter to

make a measurement. !Enters m eas urement results !Displays measurement result

220 END

Example: Scanning

Channels Using E1412A

Multimeter

!Terminates program

This example program uses the E1406A Command Module for one-wire scanning of the E1460A using the two-wire ohm s function of the E1412A multimeter. The T TL trigger bus lines perform E1412A multimeter triggering and E1460A multiplexer channel advance. This program uses the stand-alone switchbox mode.

For th is example , the following resistors are c onnected t o the channe ls indicated and t o the one-wire COM terminal. The remaining channels are open.

1kΩ on c hannel 00 HI

1.5 kΩ on channel 00 LO

1.2 kΩ on channel 01 HI

1.8 kΩ on channel 01 LO

A ty pical result returns +0, "No error" for the response to the SYST:ERR? command. The four channels with resistors connected return the nominal value of the resistor, such as 1003.129 for channel 00 HI or 1489.102 for channel 00 LO. All other channels return 9.9E+37 to indicate an open channel.

46 Using the Relay Multiplexer

Chapter 2

10 ASSIGN @Dvm TO 70903 20 ASSIGN @Mux TO 70914 30 DIM A$[80],Rdgs(1:64) 40 CLEAR @Dvm 50 CLEAR @Mux 60 OUTPUT @Dvm;"*RST;*CLS" 70 OUTPUT @Mux;"* RST;*CLS" 80 OUTPUT @Dvm;"FUNC:RES" 90 OUTPUT @Dvm ;"TRIG:SOUR TTLT0" 100 OUTPUT @Dvm;"TRIG:COUN 64" 110 OUTPUT @Dvm;"OUTP:TTLT1:STAT ON" 120 OUTPUT @Dvm;"*OPC?" 130 ENTER @Dvm;Cp 140 OUTPUT @Dvm;"SYST:ERR?" 150 ENTER @Dvm;A$ 160 PRINT A$ 170 OUTPUT @Mux ;"FUNC 1,WIRE1" 180 OUTPUT @Mux;"OUTP:TTLT0:STAT 1" 190 OUTPUT @Mux;"TRIG:SOUR TTLT1" 200 OUTPUT @Mux;"SCAN:MODE RES" 210 OUTPUT @Mux;"SCAN:PORT ABUS" 220 OUTPUT @Mux;"SCAN (@100:177)" 230 OUTPUT @Mux;"*OPC?" 240 ENTER @Mux;Cp 250 OUTPUT @Mux;"SYST:ERR?" 260 ENTER @Mux;A$ 270 PRINT A$ 280 OUTPUT @Dvm;"INIT" 290 OUTPUT @Mux;"INIT" 300 OUTPUT @Dvm;"FETCh?" 310 ENTER @Dvm;Rdgs(*) 320 PRINT Rdgs(*) 330 END

Example: Scanning

Channels Using 3457A

Multimeter

Chapter 2

This example us es the E1406A Command Module "Trig In" and "Trig Out" ports to synchronize t he multiplexer module bank 0 channel 0 to 2 closures to an external 3457A multimeter. The multimeter’s reading storage capacity is used to store measurement results.

For measurement sy nc hronization, the E1406A “Trig Out ” port is connected tothe 3457A multimeter “Ext Trig” port. This trigger signals the multimeter to make the measurement. The E1 406A "Trig Out" port is connected to the 3457A multimeter "Voltmeter Complete" port. This trigger causes the multiplexer to advance the scan.

Figure 2-7 shows how to connect the command module and multiplexer module to t he 3457A multimeter. This example uses GPIB select cod e 7, primaryaddress09, and seconda ry address 14 for the multiplexer and GPIB select code 7 and primary add ress 22 for the 3457A digital multimeter.

Using the Relay Multiplexer 47

Trig

Trig Out

E1406A

Command

Module

E1460A Multiplexer

LOHI ILO

3457A Multimeter

Voltmeter Complete

External

Trigger

+5V

Figure 2-7. Example: Scanning Channels Using 3457A Multimeter

10 OUTPUT 722;"TRIG EXT;DCV;MEM FIFO"

20 OUTPUT 70914;"*RST;*CLS"

30 OUTPUT 70914;"OUTP ON"

40 OUTPUT 70914;"TRIG:SOUR EXT"

50 OUTPUT 70914;"SCAN:MODE VOLT"

60 OUTPUT 70914;"SCAN (@10000:10015)"

70 OUTPUT 70914;"INIT"

(Rear View)

!Configures the 3457A multimeter to external

trigger to me as ure DCV and store readings !Resets multiplexer module to a known state !Enables E 1406A " Tri g Out" port !Sets switc hbox trig ger source to external

triggering !Sets switc hbox measurement mode !Defines channel list !Closes bank 0 channel 0 and enables the

scan. Causes a trigger output from E1406A

"Trig Out" port which initiates the external

multimeterto makea measurement . When the

measurement is complete, the multimeter’s

"VM Complete" port sends a trigger to the

multiplexer to advance the scan.

80 Wait 1

90 FOR Channels = 1 to 16

100 ENTER 722;Results

110 NEXT Channels

120 END

48 Using the Relay Multiplexer

!Wait 1 sec ond !Start count ing loop (16 channe ls) !Enter m eas urement result !Increment count and repeat measurement

process for 16 measurements !Terminate program

Chapter 2

Example: Scanning

Multimeter DCV

Measurements

This ex ample uses the E1406A Comman d Module, E1411B System Multimeter, and E1460A multiple xe r modules to perform a DC voltage measurement on all 64 channels in a s c anning m ult im eter configuration. In the scanning mu ltimeter configurat ion, the multiplexer module’s logica l address must be set on e number higher than the multimeter module.

Figure 2-8 shows how to connect the multiplexer module to the multimeter module. This ex ample us es GPIB select code 7, primary address 09, and secondary address 03 for the scanning multimeter (multimeter/multiplexer).

SWITCH CARD TERMINAL MODULE

OPEN

CH 0991

CH 0992

COM

CH 0

CH 1

CH 2

ANALOG BUS TO MULTIMETER

Figure 2-8. Example: Scanning Multimeter DCV Measureme nts

10 DIM Rdgs(1:64)

20 OUTPUT 70903;"*RST"

30 OUTPUT 70903;"ROUT:FUNC1,WIRE2X64"

Command

Module Module

DC VOLTAGE #1

BANK 0

DC VOLTAGE #2

DC VOLTAGE #3

Voltmeter

Multiplexer

Module

!Dimension computer to store readings !Reset the scanning m ultimeter m odule to a

known state !Required to close controlrelay0995 to a ccess

upper 4 banks

Chapter 2

40 OUTPUT 70903;"MEAS:VOLT:DC? (@100:177)"

50 ENTER 70903;Rdgs(*)

60 FOR I = 1 TO 64

70 PRINT Rdgs(I)

80 NEXT I

90 END

!Configurethe scanning multimeter tomeasure

voltage on bank 0 channels 0 to 2 !Enter m eas urement result !Start count ing loop (3 channels) !Display m easurement result !Increment the count and repeat measurement

process for a total of 3 measurements !Terminate program

Using the Relay Multiplexer 49

Example: Scanning

Multimeter Resistance

Measurements

This program uses an E1406A Comma nd Module to verify the E1460A multiplexer will work in one-wire mode for resistance measurements with the E1411B multimeter when t he two are instruments are configured as a scanning multimeter.

For this example to work in either switchbox or scanning multimeter mode, you mus t externally connect the HI current source banana jack to the HI input ba nana jack and the LO current Source/COM to the LO input banana jack on the front panel of the E1411B multimeter.

For this examp le, the following resistors are connected to the one-wire COM terminal. The remain ing channels are open.

1kΩ on c hannel 00 HI

1.5 kΩ on channel 00 LO

1.2 kΩ on channel 01 HI

1.8 kΩ on channel 01 LO

A typical result returns to the *IDN? command. Also,

and jumpers 11, 12, and 13 are in place, ROUT:FUNC? will return "WIRE1""

is displayed. The f our channels with resistors conn ected return the nominal value of the

resistor, s uchas 1003. 129 f or c hannel 00 HI or 1489.102 for channel 00 LO. All other channels return 9.9E+37 to indicate an open chann el.

10 DIM A$[40],Rdgs(1:66) 20 ASSIGN @Dvm TO 70903 30 OUTPUT @Dvm ;"*RST;*CLS" 40 WAIT 2 50 OUTPUT @Dvm ;"*IDN?" 60 ENTER @Dv m;A$ 70 PRINT A$ 80 OUTPUT @Dvm ;"ROUT:FUNC? 1" 90 ENTER @Dv m;A$ 100 PRINT "If E1460A terminal module jumper 10 is cut, and jumpers 11" 110 PRINT "12, and 13 are in place, ROUT:FUNC? will return ’WIRE1’." 120 PRINT A$ 130 OUTPUT @Dvm;"MEAS:RES? (@10000:10101)" 140 ENTER @Dvm;Rdgs(*) 150 PRINT Rdgs(*) 160 END

HEWLETT-PACKARD,E1411B,0,A.04.02

"If E1460A terminal module jumper 10 is cut

in res pons e

50 Using the Relay Multiplexer

Chapter 2

Miscellaneous Multiplexer Functions

This section describes some m isc ellaneous multiplexer functions, including:

• Using the Scan Complete Bit

• Using the Analog Bus

• Sav ing and Recalling States

• Detecting Error Conditions

• Synchronizing the Multiplexer

Using the Scan

Complete Bit

Example: Using the Scan

Complete Bit

10 OUTPUT 70914;"*CLS"

20 OUTPUT 70914;"STAT:OPER:ENAB 256"

30 OUTPUT 70914;"*SRE 128"

The s c an co mplete bit (bit 8) can be used in the Operation Status Register of a switchbox to determine when a scanning cycle compl etes (no other bits in the register apply to th e switchbox). Bit 8 has a decimal value of 256 and you can read it directly with the STAT:OPER? command.

When enabledby the STAT:OPER:ENAB 256 command, the scan complete bit will b e reported as bit 7 of t he Status Byte Register. Use the GPIB Serial Poll or the IEEE 488.2 Common Command *STB? to read the Status Byte Register. When bit 7 of the Status Byte Register is enabled by the *SRE 128 common command to assert a GPI B Service Request, you can interrupt the computer when t he scan complete bit is set, a fter the scanning cycle completes. This allows the controller to do other operations while the scanning cycle is in progress.

This example monitors bit 7 in the Status Byte Register to determine w hen the scanning cycle completes. The example uses GPIB select code 7, primary address 09, and secondary addre ss 14 for the multiplexer.

!Clear all switchbox status structure !Enable scan complete bit to set bit 7 in

Status By t e Register !Enable bit 7 of Status Byte Register to

assert RQS

Chapter 2

40 OUTPUT 70914;"TRIG:SOUR EXT"

50 OUTPUT 70914;"SCAN (@100:102)"

60 OUTPUT 70914;"INIT"

70 WHILE NOT BIT(SPOLL(70914),7)

80 PRINT "DO OTHER OPERATION HERE"

90 END WHILE

100 PRINT "INTERRUPT GENERATED"

110 END

!Set to extern al trigger mode !Defines channel list to scan bank 0 channels

0 through 2 !Start scanning cycle !Waiting for s can complete !Enter program li nes for computer to do other

operations

!Program goes t o th is line after interrupt is

generated by a com pleted scanning cycle !Terminate program

Using the Relay Multiplexer 51

Using the Analog

Bus

The multiplexer can be configured to perform voltage, two-wire ohm, or four-wire ohm measurements using the analog bus. T hes e measurements can be performed by switching or scanning channe ls (refer to the previous examples).

By s w itc hing the control relays (0990 to 0996), the COM lines can be connected to the analog bus connection for measurement using a VXI multimeter (such as the E1411B) or external multimeter (such as the 3457A). A special terminal enables the multiplexer to perform cable or harness t es ting. You can connec t the multiplexer analog bus to other measurement or switching devices to perform measurements.

During a scan, the control relays (0992 to 0994 and 0996) are automatically switched when configured using the SCAN:PORT co mm and. See [ROUTe:]SCAN:PORT on for more information.

When switching channels using the OPEN and CLOSe comm ands , the analog bus must be manually connected. When the FUNCtion command is executed, all analog bus control relays are opened. If an analog bus connection is required, you m us t close the appropriate control relay. Once switched, the relay remains c losed unless spec ifically opened (OPEN command, power-up, or *RST). Control relay numbers and functions follow.

• 0992:Conn ec ts lower 32 channels (banks 0 to3)to the analog bus

H1 t ermi nals.

Example: Connecting the

Analog Bus

• 0993: Connects upper 32 channels (banks 4 to 7) to the analog

bus H2 terminals.

• 0994: Connects lower and upper analog buses together (64

channel).

• 0996: Connects analog bus Guard (G) to the LO line on the upper

32 channels (banks 4 to 7).

In this example , as shown in Figure 2-9, the HI and LO terminals of bank 0 channel 0 are c losed and the LO terminal of bank 4 channel 0 is closed connecting t hem to their COM terminals. Control relays 0990 and 0991 are automatically s et o pen when configured for three-wire mode.

To connect bank 0 (both terminals) and bank 4 (LO terminal to Guard) to the analog bus, control relays 0992 and 0996 must be closed. To conn ec t bank 0 and bank 4 to the analog bus, execut e:

CLOS (@10992,10996)

!Close control relay 0992 to conn ec t bank

0-3 to the analog bus. Close control relay

0996 to connect bank 4-7 LO terminal to

the analog bus Guard te rminal

52 Using the Relay Multiplexer

Chapter 2

SWITCH CARD TERMINAL MODULE

OPEN

CH0992

CH0990

JM1

CH0991

CH0996

H1 H

H1 L

GUARD

COM

CH0

COM

CH0

ANALOG BUS

1IN

2IN

BANK 0

1OUT

2OUT

CABLE TEST

NO CONNECTION

3IN NO CONNECTION

3OUT

BANK 4

Figure 2-9. E xample: Connecting th e Anal og Bus

Example: Cable Testing You can connect and test multi-conductor cables or wiring harness

conductors (for cont inui ty) and insulators (for short circuit) using a single multiplexer module and system multimeter module.

Use the OP E N /CLOS < c hannel_list> commands to switch the c ontrol relays. For example, to close control relay 0992 (connect banks 0-3 to analog bus), execu te CLOS (@109 92).

The E1411B multimeter can directly measure channels of single or multiple multiplexer modules in ascanning multimeter con fig uration. The multimet er, when correctly programmed, automatically closes t he appropriate control relays (09 90-0996). For more information, see the E1326B/E1411B User’s Manual.

The cable tes t example that follows can be expanded to test cables with more than 4 conductors. Continuity is checked by closing additi onal channel relays to test the odd numbered wires on the first loop pas s , and the even numbered wires on the sec ond loop pass (lines 60-180). Insulators are checked in groups of four wires by adding an other loop (sim il ar to lines 210 to 420).

Chapter 2

Using the Relay Multiplexer 53

For this exam ple, the multiplexer module is configured to test a 4-conductor cable. Jumper JM1 must be removed to isolate the cable test terminal. Jumpers JM2 and J M3 must b e removed to isolate bank 0 from bank 2.

Figure 2-10 shows how to conne ct the cable under test and the multimeter to the multiplexer. This exa mpl e uses GPIB select cod e 7, primary address 09, and secondary address 03 for the multimeter and GPIB selec t code 7, primary address 09, and secondary addre ss 14 for the multiplexer.

In the program , lines 10-30 set up multimeter for resistance measurement. Lines 40-50 reset multiple xe r and switch banks 0-3 to analog bus. Lines 60-180 measure continuity of cable. T he first loop pass measures wires 1 and 3 and the second loop pa ss me as ures wires 2 and 4.

Lines 190-420 measure insulation (short-circuit) of cable. The firstloop pass measures wires 1 to 3, 2 to3,2 to 4, 1 to 4, and 1 to 2. The second loop pass measures wires 3 to 1, 4 to 1, 4 to 2, 3 to 2, and 3 to 4 .

SWITCH CARD

CH 0994

CH 0992

OPEN

CH 0990

OPEN

CH 0991

JM3JM2JM1

JM10 JM11

CH 0995

TERMINAL MODULE

BNK 0 CO M

BNK 0 CH 1H BNK 0 CH 1L

BNK 0 CH 2H BNK 0 CH 2L

BNK 2 COMH BNK 2 COML BNK 2 CH 1H BNK 2 CH 1L

BNK 2 CH 2H

H1(1W HI COM) L1(1W LO COM) H1 L1 G

ANALOGBUS

H2 L2 G

BNK 2 CH 2L

CABLET

1W LO REF

TO EXTERNAL MULTIMETER

TOSYSTEM MULTIMETER

JM13JM12

H1 L1 G

H1 L1

G H2 L2 G H2 L2 G

CABLE UN DER TEST

WIRE 1

WIRE 2

WIRE 3

WIRE 4

USERWIRING

54 Using the Relay Multiplexer

Figure 2-10. Example: Cable Testing

Chapter 2

10 OUTPUT 70903;"*RST" 20 OUTPUT 70903;"CONF:RES;*OPC?" 30 ENTER 70903;Opc_ 40 OUTPUT 70914;"*RST" 50 OUTPUT 70914;"CLOS (@10992)" 60 FOR I =1 TO 2 70 OUTPUT 70914;"CLOS (@101,121);*OPC?" 80 ENTER 70914;Opc_ 90 OUTPUT 70903;"READ?" 100 ENTER 70903;A(I) 110 OUTPUT 70914;"OPEN (@101,121)" 120 OUTPUT 70914;"CLOS (@102,122);*OPC?" 130 ENTER 70914;Opc_ 140 OUTPUT 70903;"READ?" 150 ENTER 70903;B(I) 160 OUTPUT 70914;"OPEN (@102,122)" 170 OUTPUT 70914;"CLOS (@10990,10991)" 180 NEXT I 190 OUTPUT 70914;"OPEN (@10990,10991)" 200 OUTPUT 70914;"CLOS (@122)" 210 FOR I = 1 TO 2 220 J = I + 100 230 OUTPUT 70914;"CLOS @";J;")" 240 OUTPUT 70903;"READ?" 250 ENTER 70903;C(I) 260 OUTPUT 70914;"CLOS (@10990)" 270 OUTPUT 70903;"READ?" 280 ENTER 70903;D(I) 290 OUTPUT 70914;"CLOS (@10991)" 300 OUTPUT 70903;"READ?" 310 ENTER 70903;E(I) 320 OUTPUT 70914;"OPEN (@10990)" 330 OUTPUT 70903;"READ?" 340 ENTER 70903;F(I) 350 OUTPUT 70914;"OPEN (@121,122)" 360 K = I + 120 370 OUTPUT 70914;"CLOS (@";K;")" 380 OUTPUT 70903;"READ?" 390 ENTER 70903;G(I) 400 OUTPUT 70914;"OPEN (@10990,10991)" 410 OUTPUT 70914;"OPEN (@":J;")" 420 NEXT I 430 PRINT "Continuity Wire # 1/2/3/4=";A(1),A(2),B(1),B(2) 440 PRINT "Insulation Wire # 1 to 2/3/4=";G(1),C(1),F(1) 450 PRINT "Insulation Wire # 2 to 1/3/4=";G(1),D(1),E(1) 460 PRINT "Insulation Wire # 3 to 1/2/4=";C(2),F(2),G(2) 470 PRINT "Insu lation Wire # 4 to 1/2/3=";D(2),E(2),G(2)

480 END

Chapter 2

Using the Relay Multiplexer 55

Saving and

Recalling States

NOTE *RCL, *RST, and *SAV do not affect the operating mode as set by the

The *SAV < num eric_s tate> command saves the current instrument state. The s t ate number (0-9) is specified in the numeric_state parameter. The following settings a re saved:

• Channel Relay States (bank 0-7 relays open or closed)

• Control Relay States (bank 9 relays open or closed)

• ARM:COUN t

• TRIGger:SOURce

• OUTPut[:STATe]

• INITiate:CONTinuous

• [ROUTe:]SCAN:MODE

• [ROUTe:]SCAN:PORT

The *RCL <numeric_s tate> command recal ls a previously saved state. Enter the number (0-9) in the numeric_stateparameter of the des ired saved state. If *SA V was not previous ly executed using the selec ted number, the multiplexer module will conf igure to the reset values (refer to table 2-2).

FUNCtion comm and or status register switch positions. I f using the FUNCtion command to set the operating mode, the *SAV/*RCL com mand must be executed AFTER t he FUNCtion comm and.

Detecting Error

Conditions

Example: Error Checking

Using Polling

There are two general approaches to error checking: polling and using interrupts. An example of each method follows.

The s im plest, but most time consuming, meth od is to ask the instrument whetherthere are errorsat every step ofthe switching process. This is called polling and is illustrated in the following example.

10 DIM Err_num$[256] 20 OUTPUT 70914;"CLOS (@101)" 30 OUTPUT 70914;"SYST:ERR?" 40 ENTER 70914;Err_num$ 50 IF VAL (Err_num $ ) 0 THEN 60 PRINT "Error";Err_num$ 70 STOP 80 END IF 90 ...(program continues)

56 Using the Relay Multiplexer

Chapter 2

Example: Error Checking

Using Interrupts

The s ec ond approach to error checking involves the use of interrupts. The following program is a method of checking f or errors using interrupts as you program t he multiplexer. The program moni tors the multiplexer’s Standard Event Status Register f or an error condition. See the E1406A Command Module User’sManual fordetailed information on the Standard Event Status Registers.

If no errors occur, the multiplexer functions as programmed. If errors do occur, the multiplexer interrupts the comp uter and the error codes and messages are read from the error queue. This example uses GPIB select code 7, primary ad dress 09, and secondary addres s 14 for the multiplexer.

10 ON INTR 7 CALL Errmsg

20 ENABLE INTR 7:2

30 OUTPUT 70914;"*SRE 32"

40 OUTPUT 70914;"*ESE 64"

50 .

60 .

70 .

80 END

90 SUB Errmsg

100 DIM Message$[256]

120 CLEAR 70914

130 B = SPOLL (70914)

!Call computer subprogram "Errm sg " if a

multiplexer programming error occurs

!Enable the computer to respond to an

interrupt from the mul tiplexer

!Unmask the event status bit in th e

multiplexer’s Status Register

!Unmask the error conditions in multiplexer

Standard Event Status Regi s ter

!Program multiplexer for desired application

!Error Mess age subprogram

!When an error occurs , clear the multiplexer

to regai n con trol

!Execute a serial poll to clear the service

request bit in the Status Register

Chapter 2

140 REPEAT

150 OUTPUT 709 14;"SYST:ERR?"

160 ENTER 70914:Code,Message$

170 PRINT Code,Message$

180 UNTIL Cod e = 0

190 OUTPUT 70914;"*CLS"

200 STOP

210 SUBEND

!Read all error messages in the multiplexer

error qu eue

!Clear all bits in the multiplexer’s Standard

Event Status Register

Using the Relay Multiplexer 57

Synchronizing the

Multiplexer

This s ec ti on discusses sync hronizing the mul tiplexer module to other instruments when making measurements.

Example: Synchronizing

Instruments

10 OUTPUT 70914;"CLOS (@101);*OPC?"

20 ENTER 70914;Opc_value

30 OUTPUT 70914;"CLOS? (@101)"

40 ENTER 70914;A

50 OUTPUT 70903;"MEAS:VOLT:DC?"

60 ENTER 70903;Meas_value

70 PRINT Meas_v alue

80 END

This example shows one way to synchronize instruments by switching a signal t o be measured by a multimeter. This program verifies that the switching is complete before the multim eter begi ns a measurement.

The example uses GP IB select code 7, primary address 09, and s ec ondary address 03 for the multimeter and GP I B select c ode 7, primary addres s 09, and secondary address 14 for the multiplexer.

!Close bank 1, channel 1 and request

confirmation that the channel is closed

!Read confirmation

!Channel is confirmed closed, so the

measurement can be made

58 Using the Relay Multiplexer

Chapter 2

Relay Multiplexer Command Reference

About This Chapter

This chapter des cribes Standard Commands for Programmable Instruments (SCPI) and IEEE 488.2 Common Commands for the E1460A Relay Multiplexer module. See the appropriate command module user’s manual for additional information on SCPI and Common Commands. This chapter contains the following sections:

Command Types

Commands are separated into t w o types: IEEE 488.2 Common commands and SCPI commands.

Chapter 3

• CommandTypes....................................59

• SCPICommandReference ...........................61

• IEEE488.2CommonCommandsQuickReference.........95

• SCPICommandsQuickReference .....................96

Common

Commands Format

SCPI Commands

Format

The IEE E 488.2 standard defines the Common commands that perform functions like reset, self-test, status byte query, etc.Common commands arefour or five characters inlength, always begin with anasterisk(*), and may include one or more param eters. The command key w ord is separated from t he fir st param eter by a space character. Some examples of Common commands are:

*RST, *ESE <mask>, *STB?

SCPI commands perform functions like closing s w itc hes, mak ing measurements, and querying instrument states or retrieving data. A subsystem command structure is a hierarchical structure that usually consists of a top-level (or root) command, one or more lower-level commands, and their parameters. The following example shows part of a typical subsystem:

[ROUTe:]

CLOSe <channel_list> SCAN <channel_list>

:MODE?

[ROUTe:] is th e optional root comma nd, CLO Se an d SCAN are second-level commands with parameters, and :MODE? is a third-level command. [ROUTe:] is an implied command and is, therefo re, optional.

Chapter 3

Relay Multiplexer Command Reference 59

Command Separator A colo n (:) always separates one command from the next lower-level

command, such as [ROUTe:]SCAN:MODE? Colons separate the root command from the second-level command ([ROUTe:]SCAN) and the second level from the third level (SCAN:MODE?).

Abbreviated Commands The command syntaxshows mo st commandsas a mix ture of upper- and

lowercase letters. The upperc as e letters indicate the abbreviated spelling for the com mand. F or shorter program lines, send the abbreviated form. For better program reada bility, you may send the entire com mand. The instrument will accept either the abbreviated form or the entire co mm and.

For ex ample, if the command syntax shows DIA Gnos tic, DIAG and DIAGNOSTIC are both acceptable forms. Other forms of DIAGnostic, such as DIAGN or DIAGNOS willgenerate an error.You m ay us e upperor lowerc as e letters. Therefore, DIAGN OS TI C, diagnos tic, and DiAgNoStIc are all acceptab le.

Implied Commands Implied commands appear in square brackets ([ ]) in the c ommand

syntax.The brackets are not part of the command and are not sent to t he instrument. Suppose you send a second-level comma nd but do notsend

the preceding im plied com mand. In this case, the instrument assumes you intended to use the im plied command and it responds as if you had sent it. Examine the portion of the [ROUTe] subsystem shown below:

Variable Commands

Syntax

[ROUTe:]

CLOSe? <channel_list>

The root com mand [ROUTe:] is an implied command. To make a query about a channel’s pres ent status, you can send either of the following command statements:

ROUT:CLOSe? <channel_list>orCLOSe?<channel_list>

Some commands have what appears to be a variable syntax, such as OUTPut:ECLTrgn and OUTPut:TTLTrgn. In these co mm ands , the n is replaced by a number. No space is left bet ween t he command and the number because the number is not a parameter. The number is part of the command syntax. In the case of OUTP:ECLTrgn, n canrangefrom 0to1.InOUTP:TTLTrgn, n can range from 0 through 7.

60 Relay Multipl exer Command Reference

Chapter 3

Parameter Types The following table contains explanations and examples of parameter

types you may see in this chapter.

Type Explanations and Examples

Boolean

Discrete

Numeric

Optional

Boolean parameters represent a single binary condition thatis eithertrue or false (ON, OFF,1, 0). Any non-zero value is con sidered true.

Discrete parameters selects from a finite number of values. These p arameters use mnem onics to represent each val id setting. An example is TRIGger:SOURc e <source>, where source can be BUS , EXTernal, HOLD, IMMediate, ECLTrgn, or TTLTrgn.

Numericparameters are commonly used decimal representations of numbers including optional signs, decimal points, and scientific no tation (for example, 123, 123E2, -123, -1.23E2, .123, 1.23E -2, 1.23000E - 01). Special c as es include MIN, MAX, DEFault, and INFinity.

Optional parameters are shown within square brackets ([]). The brackets are not part of the command and are not sent to the instrument. If you do not specify a value for an optional paramet er, the instrument choos es a default value.

For examp le, consider ARM:COUNt? [MIN |MAX ]. If you send the command wi tho ut specifying a parame ter, the present A RM:COUNt value is returned. If you send the MIN parameter, the c ommand ret urns the minimum count av ail able. If you send the MAX parameter, the command returns the maximum count available. P lace a space between the command and t he parameter.

Linking Commands Linking IEEE 488.2 Common Commands with SCPI Com mands. Use a

semicolon (;) between the commands. For example, *RS T;*RCL 1 or CLOS (@101);*SAV 1.

LinkingMultipleSCPI commands. Use both a semicolon (;) and a colon (:)

between the commands, such as CLOS (@101);:CLOS? (@101). SCPI also allows several commands within the same subsystem to be linked with a semicolon and colo n, such as ROUT:CLOS (@101);:ROUT:CLOS? (@101).

SCPI Commands Reference

This s ec tion des cribes the Stand ard Comm ands for Programmable Instruments (SCPI) for the Rel ay Multiplexer module . Commands are listed alphabetically by subsystem and within each subsystem.

Chapter 3

Relay Multiplexer Command Reference 61

ABORt

Subsystem Syntax ABORt

TheABORtcommand stops a scan inprogress when the scan isenabled via the interface and the trigger s ource is TRIGger:SOURc e B US or TRIGger:SOURce HOLD.

Comments ABORt Actions: The ABORt command terminates a scan in progress by

causing the sw itc hbox to no longer wait for a trig ger. Whe n the ABOR t command is executed, the last channel switched during the scan remains in the position.

Stopping Scan Enabled Via Interface: When a scan is enabled via an

interface,an interface c learcommand (CLEAR 7) can beused to stopthe scan. When the scan i s enabled via the interface and TRIG:SOUR BUS or HO LD is set, you can use ABORt to stop the scan.

Restarting a Scan: Use the INITiate command to restart the s c an. Related Commands: ARM, INITiate:CONTinuous, [ROUTe:]SCAN,

TRIGger

Example Stopping a Scan with ABORt

This example stops a (continuous) two-wire scan in progress in a single-module switchbox.

TRIG:SOUR BUS

INIT:CONT ON SCAN (@100:107)

INIT . . . ABOR

!Trigger command w ill be via backplane

(bus) i nterface (*TRG command

generates trigger) !Set continuous sc anning !Scan channels 0 to 7 in bank 0

!Start sc an, close channel 0

!Abort scan in progress

62 Relay Multipl exer Command Reference

Chapter 3

ARM

Subsystem Syntax ARM

ARM:COUNt

Parameters

The ARM subsystem selectsthe number of scanning cycles (1 to 32767) for each INITiate command.

:COUNt <number>MIN I MAX :COUNt?[MIN | MAX]

ARM:COUNt <number> MIN | MAX allows scanning cycles to occur a

multiple of times (1 to 32,767) with one INITiate command when INITiate:CONTinuous OFF | 0 is set. MIN sets 1 cycle and MAX sets 32,767 cycles.

Name Type Range of Values Default

<number> numeric 1 thru 32,767 I MIN I MAX 1

Comments Number of Scans: Use only numeric values between 1 and 32767, MIN,

or MA X for the number of scanning cycles.

Related Commands: ABORt, INITiate:IMMediate *RST Condition: ARM: COUNt 1

Example Setting Ten Scanning Cycles

This ex ample s ets a multiplexer mod ule for 10 scans of channels 0 through 7 i n bank 1 in a single-module switchbox.

ARM:COUN 10 SCAN (@110:117) INIT

!10 sc ans per INIT command !Scan channels 0 to 7 in bank 1 !Start sc an, close channel 0

Chapter 3

Relay Multiplexer Command Reference 63

ARM:COUNt?

Parameters

ARM:COUNt? [MIN I MAX] returns the current number of scanning cycles

setby ARM:COUNt. T he current numberof scan cycles is returned when MIN or MAX is not specified. With MIN or MAX as a parameter, MIN returns 1 and MAX returns 32,767.

Name Type Range of Values Default

<MIN | MAX> numeric MIN = 1, MAX = 32,767 current

cycles

Comments

Related Commands: INITiate[:IMMediate]

Example Query Number of Scans

This ex ample s ets a multiplexer mod ule for 10 scanning cycles and queries th e numb er of scan cycles set. The ARM:COUN? command returns 10.

ARM:COUN 10 ARM:COUN?

!Set 10 scans per INIT command !Query number of scans

64 Relay Multipl exer Command Reference

Chapter 3

INITiate

Subsystem Syntax INITiate

INITiate:CONTinous

Parameters

The I NIT iate command s ubsystem selects continuous scanning cycles and starts the scanning cy cle.

:CONTinuous <mode> :CONTinuous? [:IMMediate]

INITiate:CONTinuous <mode> enables or disables continuous scanning

cycles.

Name Type Range of Values Default

<mode> boolean 0 I 1 I OFF I ON OFF I 0

Comments Continuous Scanning Operation: Continuous sc anning is enabled with

the INITiate:CONTinuous ON or INITiate:CONTinuous 1 command. Sending the INITiate:IMMediate command close s the f irst channel in the channel list. Each trigger from the source specified by the TRIGger:SOURce command advances thescan through the channe l list. A trigger at the end of the channel list closes the first channel in the channel list and the scan cycle repea ts.

Non-Continuous Scanning Operation: Non-continuous scanning is

enabled with the INITiate:CONTinuous O FF or INITiate:CONTinuous 0 command. Sending the INITiate:IMMediate comman d close s the first channel in the channel list. Each trigger from the source specified by the TRIGger:SOURce command advances thescan through the channe l list. At the end of the scanning cycle, the last channel in the channel list is closed and the scanning cycle s tops.

Stopping Continuous Scan: See the ABORt command . Related Commands: ABORt, ARM:COUNt, TRIGger *RST Condition: INITiate:CONTinuous OFF | 0

Chapter 3

Relay Multiplexer Command Reference 65

Example Enabling Continuous Scanning

This ex ample enables continuous sc anning of bank 3, chann els 0 through 7o f a switchbox. Since TRIGger:S OURc e IMMediate (defa ult) is set,the example uses an interface clearcommand (CLEAR 7)to stop the scan.

INITiate:CONTinuous?

Example Query Continuous Scanning State

INIT:CONT ON SCAN (@130:137) INIT . CLEAR 7

INITiate:CONTinuous? queries the sc anning stat e. With continuous

scanning enabled, the command returns "1" (ON). With continuous scanning disabled, the command returns "0" (OFF).

This ex ample enables continuous sc anning of a switchb ox and que ries the st ate. Since continuous scanning is enabled, INIT:CONT? returns "1".

INIT:CONT ON INIT:CONT?

!Enable continuous scanning !Scan channels 0 to 7 in bank 3 !Start sc an, close channel 0

!Stop scan cycle

!Enable continuous scanning !Query continuous s c anning state

INITiate[:IMMediate]

INITiate[:IMMediate] starts the scanning process and closes the first

channel inthe channellist. Successive triggers from the source specified by the TRIGger:SOURce command advance the scan through the channel list.

Comments Starting the Scanning Cycle: The INITiate:IMMediate command starts

scanning by closing the first channel in the channel list. Each trigger received advances the scan to the next ch annel in the channel list. An i nvalid channel list definition causes an error (see [ROUTe:]SCAN).

Stopping Scanning Cycl es: See the ABORt command.

66 Relay Multipl exer Command Reference

Chapter 3

Example Enabling a Single Scan

This example enables a single scan of channels 0 through 7 in bank 5 of a single-module s witc hbox . The trigger source to advance the scan is immediate (internal) triggering set with TRIGger:SOURce IMMediate (default).

SCAN (@150:157) INIT

!Scan channels 0 to 7 in bank 5 !Begin scan, close channel 0 (use

immediate triggering)

Chapter 3

Relay Multiplexer Command Reference 67

OUTPut

The OUTPut command subsystem selects the source of the output trigger generated when a channel is closed during a scan. The selected output c an be enabled, disabled, and queried. The three available outputs are the ECLTrg, TTLTrg trigger buses as well as the command module’s (E1406A) front panel "Trig Out" port.

Subsystem Syntax OUTPut

OUTPut:ECLTrgn[:STATe]

:ECLTrgn< (:ECLTrg0 or ECLT rg1)

[:STATe] <mode> [:STATe]?

[:EXTernal]

[:STATe] <mode> [:STATe]?

:TTLTrgn (:TTLTrg0 through :TTLTrg7)

[:STATe] <mode> [:STATe]?

Parameters

Comments

OUTPut:ECLTrgn[:STATe] <mode> selects and enables which ECL

Trigger bus line (0 or 1) will output a trigger when a channel is closed during a sca n. This is also used to disable a selected ECL Trigger bus line. "n" specifies the ECL Trigger bus line (0 or 1) and "mode" e nables (ON or 1) or disables (OFF or 0) the specified ECLTrg bus line.

Name Type Range of Values Default

<n>numeric 0or1 N/A

<mode> boolean 0 I 1 I OFF I ON OFF I 0

Enabling ECL Trigger Bus: When enabled, a pulse is output f r om the

selected ECL Trigger bus line (0 or1)after each channel is closed during a scan. If disabled, a pulse is not output. T he output is a negative-going pulse.

ECL Trigger Bus Line Shared by Switchboxes: Only one switchbox

configuration can use the se lecte d trigger at a time. When enabled, the selected E C L Tri gger bus line (0 or 1) is pulsed by the sw itc hbox each time a s ca nned c hannel is closed. To disable the outp ut for a specific switchbox, send the OUTPut:ECLTrgn OFF or 0 command for that switchbox.

68 Relay Multipl exer Command Reference

Chapter 3

One Output Selected at a Ti me: Only one output (ECLT rg0 or 1; TTLTrg0,

1, 2, 3, 4, 5, 6, or 7; or EXTernal) can be enabled at one time. Enabling a different outp ut source will automatically disable the active output. For example, i f TTLTrg1 is the active output, and TTLTrg4 is enabled, TTLTrg1 will become disabled and TTLTrg4 wil l become the active output.

Related Commands: [ROUTe:]SCAN, TRIGger:SOURce,

OUTPut:ECLTrgn[:STATe]?

*RST Condition: OUTPut:ECLTrgn[:STATe] OFF (disabled)

Example Enabling ECL Trigger Bus Line 0

OUTP:ECLT0:STAT 1

OUTPut:ECLTrgn[:STATe]?

OUTPut:ECLTrgn[:STATe]? q ueries thepresentstate ofthe specifiedECL

Trigger bus line. The command returns "1" if the specified bus line is enabled or " 0" if the specified bus line is disabled.

Example Query ECL Trigger Bus Enable State

This example enables ECL Trigger b us line 0 and queries the enable state. The OUTPut:ECL Trgn? command returns "1" since the port is enabled.

OUTP:ECLT0:STAT 1 OUTP:ECLT0?

OUTPut[:EXTernal][:STATe]

!Enable ECL Trigger bus line 0 to output

pulse after each s can ned c hannel is

closed

!Enable ECL Trigger bus line 0 !Query bus enable state

Chapter 3

OUTPut[:EXTernal][:STATe] <mode> enables or disables the "Trig Out"

porton the E1406A Command Module to output a trigger when a channel is c losed during a scan. ON I 1 enables the port and OFF | 0 disables the port.

Parameters

Name Type Range of Values Default

<mode> boolean 0 I 1 I OFF I ON OFF I 0

Relay Multiplexer Command Reference 69

Comments Enabling “Trig Out” Port: When enabl ed, a pulse is output from the “Trig

Out” port after each s canned swit ch box channel is closed. If disabled, a pulse is not output from the port after channel closures. The output is a negative-going pulse.

“TrigOut” Port Shared by Switchboxes:Only one switchbox configuration

can use the selected trigger at a time. When enabled, the “Trig Out” port is p ulsed by the switchbox each time a scanned channel is closed. To disable t he output for a specific switchbox, sen d the OUTP OF F or 0 command for that s w itchbox.

One Output Selected at a Ti me: Only one output (ECLT rg0 or 1; TTLTrg0,

1, 2, 3, 4, 5, 6, or 7; or EXTernal) can be enabled at one time. Enabling a different outp ut source will automatically disable the active output. For example, i f TTLTrg1 is the active output and TTLTrg4 is enabled, TTLTrg1 will become disabled and TTLTrg4 wil l become the active output.

Related Commands: [ROUTe:]SCAN, TRIGger:SOURce,

OUTPut[:EXTernal][:STATe]?

*RST Condition: O U TPut[:EXTernal][:STATe] OFF (disabled)

Example Enabling "Trig Out" Port

OUTP:EXT 1

OUTPut[:EXTernal][:STATe]?

OUTPut[:EXTernal][:STATe]? queries the present state of the "Trig Out"

port. The command returns "1 " if the port is enabled or "0" i f disabled.

Example Query "Trig Out " Port Enable State

This ex ample enables the "Trig Out" port and queries the enable state. The OUTPut? command returns " 1" since the port is enabled.

OUTP:EXT ON OUTP:EXT?

OUTPut:TTLTrgn[:STATe]

OUTPut:TTLTrgn[:STATe] <mode> selects and enables which TTL

Trigger bus line (0 to 7) will output a t rigger when a channel is closed during a sca n. This is also used to disable a selected TTL Trigger bus line. "n" specifies the TTL Trigger bus line (0 to 7) and "mode" enables (ON or 1) or disables (OF F or 0) the specified TTL Trigger bus line.

!Enable "Trig Out" port to output pulse

after each scanned channel is closed

!Enable “Trig Out” port !Query port enabl e state

70 Relay Multipl exer Command Reference

Chapter 3

Parameters

Name Type Range of Values Default

<n>numeric 0or7 N/A

<mode> boolean 0 I 1 I OFF I ON OFF I 0

Comments Enabling TTL Trigger Bus: When enabled, a negative-go ing pulse is

output from the selected T TL Trigger bus line (0 to 7) after each channel inthe switchbox is closed during a scan. If disabled, a pulse is not output.

TTL Trigger Bus Line Shared by Switchboxes: Only one switchbox

configuration can use the se lectedTT L Trigger at a time. When enabled, the selected TTLTriggerbus li ne (0 to 7) is pulsed by the switchbox eac h time a s ca nned c hannel is closed. To disable the outp ut for a specific switchbox, send the OUTPut:TTLTrgn OFF or 0 command for that switchbox.

One Output Selected at a Ti me: Only one output (ECLT rg0 or 1; TTLTrg0,

1, 2, 3, 4, 5, 6>, or 7; or EXTernal) can be enabled at one time. Enabling a different outp ut source will automatically disable the active output. For example, i f TTLTrg1 is the active output and TTLTrg4 is enabled, TTLTrg1 will become disabled and TTLTrg4 wil l be the active output.

Related Commands: [ROUTe:]SCAN, TRIGger:SOURce,

OUTPut:TTLTrgn[:STATe]?

*RST Condition: OUTPut:TTLTrgn[:STATe] OFF (disabled)

Example Enabling TTL Trigger Bus Line 7

OUTP:TTLT7:STAT 1

OUTPut:TTLTrgn[:STATe]?

OUTPut:TTLTrgn[:STATe]?queries the present state of the specified TTL

Trigger bus line. The command returns "1" if the specified TTLTrg bus line is enabl ed or "0" if disabled.

Example Query TTL Trigger Bus Enable State

This ex ample enables TTL Tri gger bus line 7 and queries the enable state. The OUTPut:TTLTrgn? command returns "1" since the port i s enabled.

!Enable TTL Trigger bus line 7 to output

pulse after each s can ned c hannel is

closed

Chapter 3

OUTP:TTLT7:STAT 1 OUTP:TTLT7?

!Enable TTL Trigger bus line 7 !Query bus enable state

Relay Multiplexer Command Reference 71

[ROUTe:]

Subsystem Syntax [ROUTe:]

The [ROUTe:] command subsystem controls switching and scanning operations for multiplexer modules in a switchbox.

NOTE This c ommand opens a ll previously closed relays. Therefore, it should be

the first relay configuration command.

CLOSe <channel_list>> CLOSe? <channel_list> FUNCtion card_number,<func tion> FUNCtion? <card_number > OPEN <channel_list> OPEN? <channel_list> SCAN <channel_list>

:MODE <mode> :MODE? :PORT <port> :PORT?

[ROUTe:]CLOSe

Parameters

Comments One-Wire Mode (WIRE1): When closing a channel in one-wire m ode, the

[ROUTe:]CLOSe<channel_list>closes the multiplexer channelsspecified

by channel_list. Channel_list has the f orm (@ss 0hbc) w here ss =card number (01-99), 0h = one-wire mode only high/low switching (00 or 01), b = bank nu mber (0-7), and c = channel number (0-7).

Name Type Range of Values Default

<channel_list> numeric ss[00]00 to ss0177

ss00 to ss77 ss00 to ss037 ss00 to ss037

HIor LO linemustbe selected using channel_list. 01 selects HI, and 00 selects LO. If one-wire mode is se lected,and a four-digitchannel number is used, the LO line is selected.

Two-Wire Mode (WIRE2/WIRE2X64): Switches the HI and LO t erminals of

a channel in banks 0 through 3 or banks 4 through 7 to that bank’s HI COM and LO COM terminals.

1-wire 2-wire 3-wire 4-wire

72 Relay Multipl exer Command Reference

Chapter 3

• WIRE2: Configures the E1460A as two independent 2x32

multiplexers.

• WIRE2X64: Switches the HI and LO terminals of a channel in banks

0 through 7 to that bank’s HI COM and LO COM terminals. A m ax im um of 64 two-wire channels can be switched. This mode is available via E1406A (S witc hbox R ev. A06.00 or later). Prior to this revision, closin g control relay 0995 in two-wire mode will change the card configuration to a single 64-channel two-wire multiplexer.

Three/Four-Wire Modes (WIRE3/WIRE4): When closing a channel in

three-wire or four-wire modes, only the lower bank (0-3) is specified. The upper bank pair (4-7) will automatically close the specified channel. If an attempt is made to close the upper bank pair (4-7) channels, an error wi ll be generated.

Closing Channels: To close:

• a single channel, use ROUT:CLOS (@ssbc)or(@ss0hbc)

• multiple channel s , use ROUT:CLOS (@ssbc,ssbc,...) or

(@ss0hbc,ss0hbc,...)

• sequent ial channels, use ROUT:CLOS (@ssbc:ssbc)or

(@ss0hbc:ss0hbc)

• groups of sequential channels, use ROUT:CLOS (@ssbc:ssbc,

ssbc:ssbc)or(@ss0hbc:ss0hbc, ss0hbc:ss0hbc)

• or any combination of the above

NOTE Channel numbers can be in the chann el_list in any random order.

However, closure order for multiple channels with a sin gle command is not guaranteed.

Closing the Control Relays: The c ontro l relays (0990 to 0996) can be

closed to perform special functions (for example, connec tingchannels to the analog bus). Chan nels must be chang ed after the multiplexer has been configured using the [ROUTe:]FUNCt ion command. Close:

• 0990 to select the LO terminal for one-wire switching

• 0991 to connect one-wire LO REF terminal to the one-wire

LO COM terminal

• 0992 to connect lower 32 channels (banks 0 to 3) to the analog bus

• 0993 to connect upper 32 channels (banks 4 to 7) to the analog bus

• 0994 to connect lower and upper analog buses together

• 0995 to connec t lower and upper c ommon buses together (64-channel

two-wire operation)

• 0996 to connect analog bus Guard to the LO line on the upper 32

channels (banks 4 to 7)

*OPC? Command: Using the *OPC? command after the CLOSe

command in your programs will ensure t hat the channel CLOSe command has executed prior to performing the next function (measure, read, etc .). This programmi ng practice is highly recommen ded.

Chapter 3

Relay Multiplexer Command Reference 73

Related Commands: [ROUTe:]OPEN, C LOSe?, SCAN *RST Condition: All multipl ex er channels are open.

Example Closing Multiplexer Channels

This example closes channel 0, bank 0, in card 0 1, and channel 7, bank 6, in card 02 of a two-module switchbox. Both modules are in t wo-wire mode.

[ROUTe:]CLOSe?

Comments Queryi s Software Readback: T he ROUTe:CLOSe? command ret urns the

CLOS (@100,267)

[ROUTe:]CLOSe? <channel_list> returns the current state of the

channel(s) queried. Channel_list has the form (@ssbc)or(@ss0hbc) (see [ROUTe:]CLOSe f or definition). The command returns "1" if channel(s) are closed or returns "0" if channel(s) are open.

current software state of the channel(s) specified. It does not account for relay hardware failures. A maximum of 128 channels at a time can be queried f or a multiple-module switchbox.

Three/Four-Wire Modes (WIRE3/WIRE4): When configured for three- or

four-wire mo des, the upper bank pair (4-7) channels cannot be queried. If an attem pt is made to query the upper bank pair (4-7) channels, an error wi ll be generated.

!100 closes channel 0 , bank 0 of card #1

and 267 closes channel 7, bank 6 of

card #2

Example Query Channel Closure

This example closes channel 0, bank 0, in card 0 1, and channel 7, bank 6, in card 02 of a two-module switchbox and queries channel closure. Since the channels are programmed to be closed "1,1" is returned.

CLOS (@100,267)

CLOS? (@100,267)

74 Relay Multipl exer Command Reference

!100 closes channel 0, b ank 0 , card #1 and

267 closes channel 7, bank 6, card #2 !Query state of c hannel 0, bank 0, card #1

and channel 7, bank 6, card #2

Chapter 3

[ROUTe:]FUNCtion

Parameters

[ROUTe:]FUNCtion <card_number>, <function> selects the operating

mode of the multiplexer channels. All channels on the card specified by card_number operate in the s pec ified m ode. [ROUTe:] is NOT optional when ROUT:FUNC is used with a scanning multimeter configuration.

Name Type Range of Values Default

<card_number> numeric 01 to 99 N/A <function> discrete WIRE1IWIRE2|

WIRE 2X64 I WIRE 3 I WIRE 4

WIRE 2

Comments ROUTe is Not Always Optional: If used with a scanning multimeter

configuration, ROUTe:FUNCtion must be used.

Command Not Always Used: This comm and is not required if the status

Using the FUNCtion Command: When usingthe FUNCtion command to

reconfigure the multiplexer to a diff erent operating mode t han the status register sw itc h is set to, the command must be sent powered up.

One-Wire Mode (WIRE1): Switches either the HI or LO terminal of a

channel in banks 0 through 7, to the one-wire HI COM or one-wire LO COM terminal. When closing a c hannel in one-wire mode, the HI or LO line m ust be selected using channel_list. Only one of the 128 one-wire channels can be switched at a time.

Two-Wire Mode (WIRE2): Switches both the HI and LO terminals of a

channel in banks 0 through 3 or banks 4 through 7 to that bank’sHI COM and LO COM terminals.

AFTER the card is

Chapter 3

Two-Wire Mode (WIRE2X64): Switches the HI and LO terminals of a

channel in banks 0 through 7 to that bank’s HI COM and LO COM terminals. A max im um of 64 two-wire channels can be switched. This mode is available via E1406A (Switchbox Rev. A06.00 or later). Prior to this revision, closing c ontrol relay 0995 in two-wire mode will change the card configuration to a single 64-channel two-wire multiplexer.

Three-Wire Mode (WIRE3): Banks are paired 0/4, 1/5, 2/6, and 3/ 7.

Switches both the HI an d LO terminal of a channel in bank 0-3, to that bank’s HI and LO COM termin als. Also switches the LO terminal of t he channel in pair bank 4-7 to that bank’s LO COM terminal.

Relay Multiplexer Command Reference 75

When closing a channel in three-wire mode, only the lower bank (0-3) is specified and the upper bank pair (4-7) will automatically close. A maximum of 32three-wire channels can be switched. Selecting an upper bank (4-7) channel ca us es an error.

NOTE In three-wire mode, do not connect user wiring to the HI terminal in the

upper bank pair (4-7). This terminal is switched during three-wire operation, and dependent on relay configurations, could be switched to the HI C OM terminal.

Four-Wire Mode (WIRE4): Banks are paired 0/4, 1/5, 2/6, and 3/7.

Switches both the HI an d LO terminal of a channel in bank 0-3, to that bank’s HI COM and LO COM terminals. Also switches the HI and LO terminal of the chan nel in pair bank 4-7, to that bank’s HI and LO COM terminals.When closing a channel infour-wire mode, only the lowerbank (0-3) is specified, and the upper bank pair (4-7) will automatically close. A m ax im um of 32 four-wire channels can be switched. Selecting an upper bank (4-7) channel ca us es an error.

Related Commands: [ROUTe:]OPEN, [RO UTe:]CLOSe, [ROUTe:]SCAN *RST: *RST d oes no t change the selec ted mode.

Example Configuring Multiplexer Mode

[ROUTe:]FUNCtion?

Example Query Operating Mode

This example configures card 01 of a single-module switchbox to four-wire m ode.

FUNC 1,WIRE4

[ROUTe:]FUNCtion? <card_number> returns the current operating mod e

of the card(s) queried. See [ROUTe:]FUNCtion for card_number definition. The com mand returns "WIRE1" if in the one-wire mod e, "WIRE2" if in the two-wire mode, "WIRE3" if in the three-wi re mode, or "WIRE4" if in the four-wire mode.

This example set s card #1 in a single-module switchbox to one-wire mode and queries the operating state . Since the one-wire mode is selected, "WIRE1" is returned.

FUNC 1,WIRE1 FUNC? 1

!Configures card #1 to four-wire mode

!Configure card #1 to one-wire mode !Query m ode of card #1

76 Relay Multipl exer Command Reference

Chapter 3

[ROUTe:]OPEN

Parameters

[ROUTe:]OPEN <channel_list> opens the multiplexer channels specified

by channel_list. Channel_list has the f orm (@ss 0hbc) w here ss =card number (00-99), 0h = one-wire mode only high/low switching (00 or 01), b = bank nu mber (0-7), and c = channel number (0-7).

Name Type Range of Values Default

<channel_list> numeric ss[00]00 to ss0177

ss00 to ss77 ss00 to ss037 ss00 to ss037

1-wire 2-wire 3-wire 4-wire

Comments One-WireMode (WIRE1): When opening a channel in one-wire mode, the

HI or LO line must be selected using channel_list. 01 selects HI and 00 selects LO. If one-wire mode is se lected,and a four-digitchannel number is used, the LO line is selected.

Two-Wire Mode (WIRE2): Switches both the HI and LO terminals of a

channel in banks 0 through 3 or banks 4 through 7 to that bank’sHI COM and LO COM terminals

Two-Wire Mode (WIRE2X64): Switches the HI and LO terminals of a

Three/Four-Wire Modes (WIRE3/WIRE4): When opening a channel in

three-wire or f our-wire m odes , only the lower bank (0-3) is specified. The upper bank pair (4-7) will automatically open the specified channel. If an attempt is made to open the upper bank pair (4-7) channels, an error will be generated.

Chapter 3

Opening Channels: To open:

• a single channel, use ROUT:OPEN (@ssbc)or(@ss0hbc)

• multiple channel s , use ROUT:OPEN (@ssbc,ssbc,...) or

(@ss0hbc,ss0hbc,...)

• sequent ial channels, use ROUT:OPEN (@ssbc:ssbc)or

(@ss0hbc:ss0hbc)

• groups of sequential channels, use ROUT:OPEN (@ssbc:ssbc,

ssbc:ssbc)or(@ss0hbc:ss0hbc, ss0hbc:ss0hbc)

• or any combination of the above

Relay Multiplexer Command Reference 77

NOTE Channel numbers can be in the chann el_list in any random order. Hovever,

opening order for mul tip le channels with a single command is not guaranteed.

Opening t he Control Relays: The control relays (0990 to 0996) can be

opened to perform special functions (for example, isolating channels from the analog bus). Chann els must be changed after the multiplexer has been configured using the [ROUTe:]FUNCtion comm and. Open:

• 0990 to select t he HI terminal for one-wire switching

• 0991 to connect Cable Test terminal to the one-wire LO COM terminal

• 0992 to disconnect lower 32 channels (banks 0 to 3) fro m the analog

bus

• 0993 to disconnect upper 32 channels (banks 4 to 7) from the analog

bus

• 0994 to disconnect lower and upper analog buses

• 0995 to disconnect lower and upper common buses (dual 32-channel

two-wire operation)

• 0996 to disconnect analog bus Guard from the LO line on the upper

32 channels (banks 4 to 7)

*OPC?Command: Using the *OPC? command after the OPEN command

in y our programs will ensure that the channel OPEN command has executed prior to performing thenextfunc tion (measure, read, etc.).This programming practice is highly r ec ommended.

RelatedCommands: ROUT e:]CLOS e, [ROUTe:]OPEN?, [ROUTe:]SCAN *RST Condition: All multipl ex er channels are open.

Example Opening Multiplexer Channels

This ex ample opens channel 0, bank 0, in card #1 and channel 7, bank 6, in card #2 of a two-module switchbox. Both modules are in t wo-wire mode.

OPEN (@100,267)

!100 opens channel 0, bank 0 of card #1

and 267 opens channel 7, bank 6 of

card #2

78 Relay Multipl exer Command Reference

Chapter 3

[ROUTe:]OPEN?

Comments Query is Software Readback: TheROUTe:OPEN?commandreturnsthe

Example Query Channel Open State

[ROUTe:]OPEN?<channel_list>returnsthe current s t ate of thechannel(s)

queried. Channel_list has the form (@ssbc)or(@ss0hbc)(see [ROUTe:]OPEN for definition). The command returns "1" if channel(s) are open or returns "0" if channel(s) are closed.

current software state of the channel(s) specified. It does not account for relay hardware failures. A maximum of 128 channels at a time can be queried f or a multiple-module switchbox.

Three/Four-Wire Modes (WIRE3/WIRE4): When configured for three- or

four-wire mo des, the upper bank pair (4-7) channels cannot be queried. If an attem pt is made to query the upper bank pair (4-7) channels, an error wi ll be generated.

This ex ample opens channel 0, bank 0, in card #1 and channel 7, bank 6, in card #2 of a two-module switchbox and queries the channel open states. S ince th e chan nels are programm ed to be opened "1 ,1" is returned.

[ROUTe:]SCAN

Parameters

OPEN (@100,267)

OPEN? (@100,267)

[ROUTe:]SCAN <channel_list> defines the channels to be scanned .

Channel_list has the form (@ss0hbc) where ss = card number (00-99), 0h = one-wire mode only high/low switc hing (00 or 01), b = bank number (0-7), and c = channel number (0-7).

Name Type Range of Values Default

<channel_list> numeric ss[00]00 to ss0177

!100 opens channel 0, bank 0,card #1 and

267 opens channel 7, bank 6, card #2 !Query state of c hannel 0, bank 0, card #1

and channel 7, bank 6, card #2

1-wire ss00 to ss77 ss00 to ss037 ss00 to ss037

2-wire

3-wire

4-wire

Chapter 3

Relay Multiplexer Command Reference 79

Comment Defining Scan List: When ROUTe:SCAN is executed, the c hannel list is

checked for val id card, terminal, bank, and channe l numbers. An error is generated for an invalid channel list.

64 Channel Li mit: Individual c hannel numbers are limited to 64 due to the

maximum length of c ommand in the current driver.

Scanning Channels: To scan:

• a single channel, use ROUT:SCAN (@ssbc)or(@ss0hbc)

• mu ltiple channels, use ROUT:SCAN (@ssbc,ssbc,...) or

(@ss0hbc,ss0hbc,...)

• sequent ial channels, use ROUT:SCAN (@ssbc:ssbc)or

(@ss0hbc:ss0hbc)

• groups of sequential channels, use ROUT:SCAN (@ssbc:ssbc,

ssbc:ssbc)or<(@ss0hbc:ss0hbc, ss0hbc:ss0hbc)

• or any combination of the above

NOTE Channel numbers can be in the chann el_list in any random order.

Scanning Operation: When a valid channel list is defined,

INITiate[:IMMediate] begins the scan and closes the first channel in the channel_list. Successive triggers from the source s pec ified by TRIGger:SOURce advance the scan through the channel list.

Example Scanning Using External Devices

[ROUTe:]SCAN:MODE

Parameters

Stopping Scan: S ee the ABORt command. Related Commands: OUTPut, TR IGger *RST Condition: All channels open.

See "S canning Channels" in Chapter 2 for exampl es of scanning programs us ing external instrum ents.

[ROUTe:]SCAN:MODE <mode> sets the m ultiplexer channels define d by

the [ROUTe:]SCAN <channel_list> command fo r none, volts, two-wire ohms, or four-wire ohm s measurements.

Name Type Range of Values Default

<mode> discrete NONE I VOLT I RES I FRES NONE

80 Relay Multipl exer Command Reference

Chapter 3

Comments Order of Command Execution: The [ROUTe:]SCAN:MODE and

[ROUTe:]FUNCtion commands m ust be executed before the [ROUTe:]SCAN <channel_list> c ommand.

ROUTe:]SCAN:MODE versus [ROUTe:]FUNCtion:FRES: Meas urement

[ mode is not supported when FUNCtion is set to WIRE1 (one-wi re m ode).

NONE and VOLT Mode: When s elect ed, channel_list is setup for volts

measurements. VOLT mode is also used when making two-wire ohms measurements using two-wire multimeters.

RES Mode: When selected, channel_list is setup for two-wire ohms

measurements. Control relay 0994 is closed when SCAN:PORT ABUS is selected. When selected, the mu ltimeter SENSE/SOURCE leads are used to make the m eas urement. When us ing the H I/LO lead s on a multimeter to make the measurement, use t he VOLT m ode.

FRES Mode: When selected, channel_list is setup for four-wire ohms

measurements. When using four-wire ohms measurement mode, only the lower bank (0-3) is specified with the [ROUTe:]SCAN <channel _list> command. The upper bank pair (4-7) will aut omatically sel ec t the specified channel. Selecting an upper bank (4-7) channel causes an error.

*RST Condition: [ROUTe:]SCAN:MODE NONE

Example Selecting Four-Wire Ohms Measurements

This example selects four-wire ohms measurement mode (FRES) on card # 1 of a single-module switchbox.

FUNC 1,WIRE4 TRIG:SOUR EXT SCAN:MODE FRES SCAN (@130:137)

INIT

!Set mode t o four-wire !Selects external t r igger sourc e !Selects four-wire W scan mode !Scan channels 0 to 7 in bank 3 (paired

with channels 0 to 7 in bank 7)

!Starts s canning cy cle

Chapter 3

Relay Multiplexer Command Reference 81

[ROUTe:]SCAN:MODE?

Comments Values Returned. The command returns NONE, VOLT, RES, o r FRES if

Example Query the Scanning Mode

[ROUTe:]SCAN:MODE? returns the current state of the s c an mode .

the scan mo de is in the none, volts, two-wire ohms, or four-wire ohms measurement mode, respectively.

Thisexample selects thefour-w ire ohms measurement mode (FRES) on card #1 of a single-module switchbox, then queries the measurement state. Bec aus e fo ur-w ire ohms mode is selected, the query command returns "FRES".

[ROUTe:]SCAN:PORT

Parameters

Comments Order of Command Execution: Measurement modes are selected by the

SCAN:MODE FRES SCAN:MODE?

[ROUTe:]SCAN:PORT <port> en ables or disables the closin g of the

analog bus connection control relays 0992, 099 3, and 0996 during scanning. SCAN:PORT ABUS closes the appropriate control relay for analog bus connections. The ROUTe:SCAN:PORT NONE comman d prevents closing t he c ontrol relays.

Name Type Range of Values Default

<port> discrete ABUS | NONE NONE

[ROUTe:]FUNCtion and [ROUTe:]SCA N:MODE c ommands. Then the [ROUTe:]SCAN:PORT command, followed by the [ROUTe:]SCAN <channel_list>command.

!Select four-wire oh ms scanning m ode !Query t he s ca nning m ode

Analog Bus Connection: The SCAN:PORT ABUS command only

connects/disconnects the analog bus during scans. To connect/ disconnect the analog bus when not scanning channels, it is necessary to switch the appropriate control relays (0992, 0993, and 0996). See the [ROUTe:]CLOSe or [ROUTe:]OPEN for more information.

*RST Condition: [ROUTe:]SCAN:PORT NONE

82 Relay Multipl exer Command Reference

Chapter 3

Example Selecting the Analog Bus Port

Thisexample selects thefour-w ire ohms measurement mode (FRES) on card #1 of a single-module switchbox and then enables the analog bus connection. Control relays 0992/0993 close and 0990/0991/0994/0995 open.

[ROUTe:]SCAN:PORT?

Example Query the Scan Port

FUNC 1,WIRE4 TRIG:SOUR EXT SCAN:MODE FRES SCAN:PORT ABUS SCAN (@130:137)

INIT

[ROUTe:]SCAN:PORT? returns the current state of the analog bus port .

The command returns NONE i f the analog bus connection control relays are disabled or ABUS if the control relays are enabled.

This ex ample selects the analog bu s port and then queries the state. Because the analog bus port is selected, the query command returns "ABUS".

SCAN:PORT ABUS SCAN:PORT?

!Set mode t o four-wire !Select external trigge r source !Select the four-wire ohm s mode !Select the analog bus port !Scan channels 0-7 in bank 3 (pa ired

with channels 0-7, bank 7)

!Start scanning cycle

!Select the analog bus port !Query the port sele ction

Chapter 3

Relay Multiplexer Command Reference 83

STATus

Subsystem Syntax STATus

The STA Tus subsystem reports the bit values of the Operation Status Register.It also allows y ou to unmask the bits you want reported from the Standard E v ent Re giste r and to read the summary bits from the Status Byte Regist er.

:OPERation

:CONDition? :ENABle <number> :ENABle? [:EVENt?]

:PRESet

The S TATussystem contains four registers, two ofwhichare under IEEE

488.2 control: the S tandard E vent Status Registe r (*ESE?) and the Status Byte Register (*STB?). The o perat ional status bit (O PR), service request bit (RQS), standard event summa ry bit (ESB), message available bit (MAV) and questionable data bit (QUE) in the Status Byte Register(bi ts 7, 6, 5, 4 and 3 respectively)can be queried with the *STB? command.

Use the *E SE? c omm and t o query the “unmask” value for the Standard Event Status Register (the bits you want logically OR’d in to the sum mary bit). The registers are queried using decimal weighted bit values. The decimal equivalents for bits 0 through 15 are included in Figure 3-1.

A num eric v alue of 256 executed in a STAT:OP ER:ENABle <number> command allows only bit 8 to ge nerate a summ ary b it. The decimal value for bit 8 is 256.

The dec im al values are also used in the inverse manner to determine which bits are set from the total value returned by an EVENt or CONDition query. The multiplexer driver exploits only bit 8 o f Operation Status Register. This bit is called the scan complete bit which is set whenever a scan operation completes. S ince c ompletion of a scan operation is an event in time, bit 8 will never appear set w hen STAT:OPER:COND? is queried. However, you can find bit 8 set with the STAT:OPER:EVEN? query command.

84 Relay Multipl exer Command Reference

Chapter 3

Automatically Set at

Power On Conditions

Automatically Set by

RelatedCommands

are *OPC? and *WAI

Parser

Set by *OPC

Output Queue

Standard Event Register

PowerOn

User Request

Command Error

Execution Error

Device Dependent Error

Query Error

Request Control

Operation Complete

0 1 2 3 4 5 6 7

EV EN

Operation Status Register

STATus:OPERation:CONDition?

STATus:OPERation:EVENt?

STATus:OPERation:ENABle

*ESR?

<1> <2> <4>

<8> <16> <32> <64>

<128>

*ESE <unmask> *ESE?

"OR"

Summary

NOTE:

QUE = Questionable Data MAV = M essage Available ESB = StandardEvent RQS = Request Service OPR= Operation Status C = ConditionRegister EV = Event Register EN = Enable Register SRQ= InterfaceBus

ServiceRequest

Status Byte Register

*STB? SPOLL

Bit

MAV

ESB RQS

OPR

0 1 2 3 4 5 6 7

Status

Byte

Summary Bit

<1> <2> <4>

<8> <16> <32>

<128>

*SRE < unmask> *SRE?

"OR"

SRQ

System

Controller

Interface Bus SRQ Line

SRQ

Other

Instrument

SRQ

Other

Instrument

ScanComplete

1 2

4 5 6 7 8 9

10 11 12 13 14 15

CEV EN

<1> <2> <4>

<8> <16> <32> <64>

<128> <256>

<512> <1024> <2048> <4096> <8192>

<16384> <32768>

Figure 3-1. Relay Multiplexer Status System Registers

"OR"

Summary

Bit

unmask examples:

Operation Complete

*ESE 61 unmasks standard event register bits 0,

2, 3, 4 and 5 (*ESE 128 only unmasks bit 7).

*SRE 128 unmasks the OPR bit (operation) in

the status byte register. This is effective only if the STAT:OPER:ENAB 256 command is ex ecuted.

STAT:QUES:ENAB256 unmasks the "Scan Complete"

bit.

unmask decimal

bit

weight

<128>7

"OR"

ESB

Chapter 3

Relay Multiplexer Command Reference 85

STATus:OPERation:CONDition?

STATus:OPERation:CONDition? returns the st ate of the Condition

Register in the Operation Status Group. The state represents conditions which are part of the instrument’s operation. The mul tiplexer driver does not set b it 8 in this register (see STATus:OPERation[:EVENt]?).

STATus:OPERation:ENABle

STATus:OPERation:ENABle <number> sets an enable mask to allow

events recorded in the Ev ent Register to send a summary bit to the Status By te Registe r (bit 7). For multiplexer modules, when bit 8 in the Operation Status Register is set t o 1 and that bit is enabled by the STATus:OPERation:ENABlecommand, bit 7 inthe Status Register is set to 1.

Parameters

Name Type Range of Values Default

<number> numeric 1 through 65,535 N/A

Comments SettingBit 7 of theStatus Register: STATus:O PERat ion:ENABle 256 s ets

bit 7 of the Status Register to 1 after bit 8 of the Operation Status Register i s set to 1.

Related Commands: [ROUTe:]SCAN

Example Enabling the Status Register

STAT:OPER:ENAB 256

STATus:OPERation:ENABle?

STATus:OPERation:ENABle? returns which bits in the Event Register

(Operation Status Group) are unmasked.

!Enables bit 8 of the Operation Status

86 Relay Multipl exer Command Reference

Chapter 3

STATus:OPERation[:EVENt]?

STATus:OPERation[:EVENt]? returns w hich bits in the Event Register

(Operation Status Group) are set. The Event Register indicat es wh en there has been a time-related instrument event.

Comments Setting Bit 8 of the Operation Status Register: Bit 8 (scan complete) is set

to 1 after a scanning cycle completes. Bit 8 returns to 0 (zero) after sending the STATus:OPERation[:EVENt]? command.

ReturnedDataafter Sending STATus:OPERation[:EVENt]?:The command

returns “ +256” if bit 8 of the Operation Status Register is set to 1. The command returns “+0” if bit 8 of the Operation Statu s Register is s et to 0.

Event Register Cleared: Reading the Event Register with the

STATus:OPERation:EVEN t? command c lears it.

Aborting a scan: Aborting a scan will leave bit 8 set to 0. Related Commands: [ROUTe:]SCAN

Example Reading the Operation Status Register After a Scanning Cycle

STATus:PRESet

STAT:OPER?

read the register value

STATus:PRESet affects only the Enable Register by setting all Enable

Register bits to 0. It does not affect either the "status byte" or the "standard event status". PRESet does not clear any of the Event Registers.

!Returns the bi t values of the Standard

Operation Status Register

!+256 shows bit 8 is set to 1 and +0

shows bit 8 is set to 0.

Chapter 3

Relay Multiplexer Command Reference 87

SYSTem

TheSYSTem subsystemreturns the numbersandmessages in the error queue of a switchbox , and returns the switchbox modul e des criptio ns .

Subsystem Syntax SYSTem

SYSTem:CDEScription?

SYSTem:CDEScription? <number> returns the module description.

Parameters

:CDEScription? <number> :CPON <number>|ALL :CTYPe? <num ber > :ERRor?

Name Type Range of Values Default

<number> numeric 1 through 99 N/A

Comments Multiplexer Module Description: The SYSTem:CDEScription?command

returns the following E1460A des criptions, depending on mode currently configured:

• One-Wire Mode: "128 Channel S.E. Relay Mux"

• Two-Wire Mode: "Dual 32 Channel 2-W ire Relay Mux"

• Two-Wire 64 Mode: "64 Cha nnel 2-Wire Relay Mux"

• Three-Wire Mode: "32 Channel 3-Wire Relay Mux"

• Four-Wire Mode: "32 Channel 4-W ire Relay Mux"

Example Reading the Description of a Card #1 Module

This example select s the one-wire mode, then queries the description. Because one-wire mode is selected, the query command returns "WIRE1".

FUNC 1,WIRE1 SYST:CDES?

!Set mode to one-wire !Return the description

88 Relay Multipl exer Command Reference

Chapter 3

SYSTem:CPON

Parameters

SYSTem:CPON <number> |ALLsets the selected module (card) in a

switchbox to its power-on state , with the exception of th e mode sele cted.

Name Type Range of Values Default

<number> numeric 1 through 99 N/A

Comments

Example Setting Card # 1 Module to its Power-on St ate

SYSTem:CTYPe?

Parameters

Multiplexer Module Power-on State: The power-on state is all c hannels

(relays) open. Note that SYSTem:C PON AL L and *RST opens all channels ofallmodules in a switchbox, while SYSTem:CPON<number> opens the channels in only the module (card) specifie d in the command. Current operating mode (as set by FUNCtion command) will not be affected by ex ec ution of the SYSTem:CPON <number>or*RST commands.

SYST:CPON 1

SYSTem:CTYPe? <number> ret urns the module (card) type of a selected

module in a switchbox.

Name Type Range of Values Default

<number> numeric 1 through 99 N/A

!Set card #1 to its power-on state

Chapter 3

Comments

64-Channel Multiplexer Module Model Number: The SYSTem:CTYPe?

<number> command returns where the 0 after E1460A is the module serial number (always 0) and A.02.00 is an e xample o f the module revision code nu mber.

HEWLETT-PACKARD,El460A,0,A.02.00

Example Reading the Model Number of a Card #1 Module

SYST:CTYP? 1

!Returns the m odel number

Relay Multiplexer Command Reference 89

SYSTem:ERRor?

Comments Error Numbers/Messages in the Error Queue: Each error generated by a

SYSTem:ERRor? returns the error numbers and corresponding error

messages in the error queue of a switchbox. See Appendix C for a listing of swit c hbox e r ror numbers and messages.

switchbox s tores an error number and corresponding error message in the error queue. The error message can be up to 255 characters long.

Clearingthe Error Queue: An error number/message is removed from the

queue each time the SYSTem:ERRor?command is sent. The errorsare cleared fi rst-in, first-out. When the queue is empty, each following SYSTem:ERRor? command returns +0, “No error”. To clear all error numbers/messages in the queue, execute the *CLS command.

Maximum Error Numbers/Messagesin the Error Queue: The queue holds

a maximum of 30 error nu mbers/messages for each switchbox. If the queue ov erflow s, the last error number/me ssage in the queueis replaced by -350, “Too many errors”. The least recent error numbers/messages remain in the que ue and the most recent are discarded.

*RST Condition: * R ST does n ot clear the error queue.

90 Relay Multipl exer Command Reference

Chapter 3

TRIGger

Subsystem Syntax TRIGger

TRIGger[:IMMediate]

Comments Executing the TRIGger[:IMMediate] Command: First, the measurem ent

The TRIGger com mand subsystem controls the triggerin g operation of multiplexer modules in a switchbox.

[:IMMediate] :SLOPe <slope> :SLOPe? :SOURce <source> :SOURce?

TRIGger[:IMMediate] ca use s a trigger event to occur when the defined

trigger sou rce is TRIGger:SOURce BU S or TRIGger:SOURc e HOLD.

modes m ust be selected using the [ROUTe:]FUNCtion and [ROUTe:]SCAN:MODE commands. Then [ROUTe:]SCAN:PORT is selected,followed by the [ROUTe:]SCAN <channel_list> command and anINITiate[ :IMMediate]command.All must be executed(unless defaults are used) before TRIGg er[:IMM ediate] will execute.

BUS or HOLD Source: If selected, the TRIGger:SOURce BUS or

TRIGger:SOURce HOLD commands remai n in effect after triggering a switchbox with the TRIGger[:IMMediate] command.

Related Commands: INITiate, [ROUTe:]SCAN

Example Advancing Scan Using TRIGger Command

This ex ample us es the TRIGger command to advance the scan of a single-module switchbox from bank 0, channels 0 through 7. Since TRIGger:SOURce HOLD is set, t he scan is adv anced one channel each time TRIGger i s executed. For the examp le, ROUTe:S C AN:MODE and ROUTe:SCAN:PORT default values of NONE are used.

TRIG:SOUR HOLD SCAN (@100:107) INIT loop statement TRIG increment loop

!Set trigger source to HOLD !Scan channels 0 to 7 in bank 0 !Begin scan, close channel 00 !Start count loop !Advance scan to next channel !Increment loop count

Chapter 3

Relay Multiplexer Command Reference 91

TRIGger:SLOPe

Parameters

TRIGger:SLOPe<slope> is used to s electthe polarity of the output trigger.

For the E1460A, this command is not used.

Name Type Range of Values Default

<slope>discrete NEG NEG

Comments

TRIGger:SLOPe?

Example Query Trigger Slope

TRIGger:SOURce

Parameters

Command Not Supported. Attempting t o chan ge the TRIGg er:SLOP e to

anything other than NE G will generate an error.

TRIGger:SLOPe?isused to querythe polarity of t he output trigger.Forthe

E1460A, this query alw ay s returns NEG.

TRIG:SLOP?

TRIGger:SOURce <source> specifies the trigger source to advance the

channel list during sc anning.

Name Type Range of Values Default

!Always returns NEG

BUS discrete *TRG or GET command IMM ECLTrgn numeric ECL Trigger bus line 0 or 1 IMM EXTernal discrete "Trig In" port IMM HOLD discrete Hold Triggering IMM IMMediate discrete Immediate Triggering IMM Trgn numeric TTL Trigger bus line 0 - 7 IMM

Comments

92 Relay Multipl exer Command Reference

Enabling the Trigger Source: The TRIGger:S OURc e c omm and only

selects the trigger source. The INITia te[:IM Mediate] command enables the trigger source.

Chapter 3

Using the TRIGger Command: You can use TRIGger[:IMMediate] to

advance the scan when TRIGg er:SOURce BUS> or TRIGger:SOURce HOLD is selected.

One Trigger Input Selected at a Time: Only one input (ECLTrg0 or 1;

TTLTrg0, 1, 2, 3, 4, 5, 6, or 7; or EXTernal) can be se lecte d at one time. Enabling a different trigger source will automatically disable the active input. For example, if TTLTrg1 is the active input, and TTLTrg4 is enabled, TTLTrg1 will become disabled and TTLTrg4 will become the active input.

Using External Trigger Inputs: With TRIGger:SOURce EXTernal

selected, only one switchbox at a time can use the external trigger input at the E14 06A “Trig In” port. The trigger input is as signed to the first switchbox that requ es ted the external trigger source (with an TRIGger:SOURce EXTernal command).

Using TTL or ECL Trigger Bus Inputs: With TRIGger:SOURce TTLTrgn or

ECLTrgn selected, only one switchbox at a time can use the trigger bus selected on the E1406A Command Module bus. The trigger input is assigned to the first switchbox that requested the trigger source (with a TRIGger:SOURce TTLTrgn or ECLTrgn command). Only one of the ten available trigger bus lines (ECL0 to 1 or TTL0 to 7) can be specified at one time.

Assigning EXTernal I TTLTrg I ECLTrg Trigger Source: A switchbo x

assigned with TRIGger:SOURce EXT | TTLT | ECLT remains assigned to that source until the switchbox trigger source is changed to BUS, HOLD, or IMMediate. When the source is changed, the trigger source is available to the next switchbox that requests it (with a TRIGger:SOURce ECLTn command). If a s witchbox requests a trigger already assigned to another switchbox, an error is generated.

UsingBusTriggers: To triggerthe switchbox withTRIGger: SO URce BUS

selected, use the I EEE 488. 2 common c ommand *TRG or the GPIB Group Execute Trigger (GET) command.

“Trig Out” Port Shared by Switchboxes: See the OUTPut com mand. Related Commands: ABORt, [ROUTe:]SCAN, OUTP ut *RST Condition: TR I Gger:SO URc e IMM ediate

Example Scanning Using External Triggers

This ex ample uses external triggering (TRIG:SOUR EXT) to scan bank 0,channels 0 through 7 of a single-modu le switchb ox . The trigger source to advance the scan is the input to the " Trig In" on an E1406A Command Module. When INIT is executed, the sc an is started and bank 0, channel 0 is closed. Then, each trigger received at the "Trig In" port advances the scan to the next channel. For the example, ROUTe :SCAN:MODE and ROUTe:SCAN:PORT default values of NONE are used.

Chapter 3

Relay Multiplexer Command Reference 93

TRIG:SOUR EXT SCAN (@100:107) INIT trigger externally

Example Scanning Using Bus Triggers

This example uses bus triggering (TRIG:SOUR BUS) to scan bank 0, channels 0 through7 of a single-module switchbox. The trigger source to advance the scan is the *TRG command (as set with TRIGger:SOURce BUS). When INIT is executed, the scan is s tarted and bank 0, channel 0 is cl ose d. Th en, each *TR G co mm and adv ances the scan to the next channel. For th e example, ROUTe: SCAN: MODE and ROUTe:SCAN:PORT default values of NONE are used.

!Select external triggering !Scan channels 0 to 7 in bank 0 !Begin scan, close bank 0, channel 0 !Advance scan to next channel

TRIGger:SOURce?

Example Querying the Trigger Source

TRIG:SOUR BUS

SCAN (@100:107) INIT loop statement *TRG increment loop

TRIGger:SOURce? returns the current trigger source f or the switchbox.

Command returns BUS, ECLT, EXT, HOLD, IMM, or TTLT for sourc es BUS, ECLTrgn, EX Ternal, HOLD, IMMedia te, or TTLTrgn, respectiv ely.

This ex ample set s external triggering and queries the trigger source. Since external triggerin g is set, TRIG:SOUR? returns "EXT".

TRIG:SOUR EXT TRIG:SOUR?

!Trigger command w ill be via backplane

(bus) i nterface (*TRG command

generates trigger) !Scan channels 0 to 7 in bank 0 !Begin scan, close bank 0, channel 0 !Loop to s c an all channels !Advance scan using bus triggering !Increment loop count

!Set external trigger source !Query trigger source

94 Relay Multipl exer Command Reference

Chapter 3

IEEE 488.2 Common Commands Reference

The following table lists the IEEE 488.2 C omm on ( *) Commands that apply to the E1460A Relay Multiplexer module. For more information on Common Commands, see the applicable command module user’s manual or the A NS I/IEEE St andard 488. 2-1987.

Command Title Description

CLS

*ESE

*ESE?

*ESR

*IDN?

*OPC

*OPC?

*RCL

*RST

*SAV

<mask>

Clear Status Register Clearsall StatusR egisters, t he Request for OPC flag, and all Queues

(except output queue). Event Status Enable Sets the bits in the Standard Event StatusEnable Register Event Status Enable Query Queries the current contents in the Standard Event Status Enable

Register. Identification Query Returns I dentification String of the switchbox. Operation Complete Sets the Request for OPC flag when all pending operations have

completed.Also sets OPC bit in the Standard Event Status Register. Operation Complete Query Returnsa "1" t o the output queue when all pending operations have

completed.Ensures synchronization between multiple instruments. Recall Saved State Recalls previously stored multiplexerconfiguration. <n>(0to9)is

location in memory where the desired (previously stored) set-up is

located. Reset Opens all channels and invalidates current channel list for scanning.

Sets ARM:COUN 1, TRIG:SOUR IMM, INIT:CONT OFF,

OUTP:STATOFF,SCAN:MODE NONE, and SCAN:PORT NONE Save Current State Stores the current multiplexerconfiguration i n memory. Stores

current settings of the channel states.<n>(0to9)isthelocation

in memory where the current set-up is to be stored.

*SRE

<mask>

*SRE?

*STB?

*TRG

*TST?

*WAI

Chapter 3

Service Request Enable Sets the Service Request Enable Register bits and corresponding

Serial Poll Status Register bits to generate a service request. Enable

an event by specifying its decimal weight for ma sk. Service Byte Enable Query Queries current contents in the Service Request Enable Register. Status Byte Query Queries the current contents in the Status Byte Register. Trigger When scan is enable and trigger source to TRIG:SOUR BUS, use

*TRG to trigger the switchbox to advance the scan. Self-Test Query ( cc = card

number with leading 0 deleted)

Wait to Continue Halts execution of commands and queries until No Operation

Returns+0ifselftestpasses.

Returns +cc01 for firmware error.

Returns +cc02 for bus error (communication problem with card).

Returns +cc03 for bad ID information (ID Register on card).

Returns +cc10 if an interrupt was expected but not received.

Returns +cc11 if the busy bit was not held ~9 to 17 msec.

Pending message is true.

Relay Multiplexer Command Reference 95

SCPI Commands Quick Reference

The following table summarizes SCPI comm ands for the E1460A Relay Multiplexer module.

Command Description

ABORt

ARM :COUNt <

:COUNT? [MIN | MAX]

INITiate :CONTinuous ON I OFF I 1 | 0

:CONTinuous? [:IMMediate]

OUTPut :ECLTrgn[:STATe] ON | OFF 1| 0

:ECLTrgn[:STATe]? [:EXTernal][:STATe] ON I OFF 1 I 0 [:EXTernal][:STATe]? :TTLTrgn[:STATe]ON I OFF I 1 I 0 :TTLTrgn[:STATe]?

[ROUTe:] CLOSe <

CLOSe? < FUNCtion FUNCtion? < OPEN < OPEN? < SCAN < SCAN:MODE < SCAN:MODE? SCAN:PORT < SCAN:PORT?

number

channel_list

channel_list>

<card_number

channel_list

> MIN | MAX

card_number

mode

port

>,<

function

Abort a scan in progress Multiple scans per INIT command

Query number of scans Enables/Disables continuous scanning

Query c ontinuous scan state Starts a scanning cycle

Enables/Disables ECL Trigger bus line pulse Query ECL Trigger bus line state Enables/Disables "Trig Out" pulse Query port enable state Enables/Disables TTL Trigger bus line pulse Query TTL Trigger bus line state

Close channel(s) Query channel(s)

Set operating mode Query operating mode Open channel(s) Query channel(s) Define channels for scanning Set scan mode Query scan mode Select Analog Bus Query Analog Bus state

STATus :OPERation:CONDition?

:OPERation:ENABle < :OPERation:ENABle? :OPERation[:EVENt]? :PRESet

SYSTem :CDEScription? <

:CPON < :CTYPe? < :ERRor?

TRIGger [:IMMediate]

:SLOPe < :SLOPe? :SOURce BUS :SOURce ECLTrg :SOURce EXTernal :SOURce HOLD :SOURce IMMediate :SOURce TTLTrg :SOURce?

number

slope

number

> I ALL

number

Returns status of Condition register Enables events in t he Event register to be reported Returns which bits in the Event register are unmasked Returns which bits in the Event register are set Sets Enable register bits to 0

Returns description of module in switchbox Sets specified module in a switchbox to its power-on state Returns the module type Returns error number/message to error queue

Causes a trigger to occur Select negative polarity of the out put trigger Query polarity of the output trigger Triggersource is *TRG Triggersource is ECL Triggerbus line 0 or 1 Triggersource is "Trig In" port Hold off triggering Continuous (internal) triggering Triggersource is TTL Trigger bus line (0 - 7) Query current t rigger source

96 Relay Multipl exer Command Reference

Chapter 3

Input Characteristics

Appendix A

Relay Multiplexer Specifications

Maximum Voltage Terminal to Terminal:

220 Vdc; 250 Vac

Maximum Current per Channel (non-inductive):

1 Adc or ac

0.3 Adc or ac

Bias Current:

From HI or LO t o chassis, per group of 16 channels:

<0.5 nA/Volt(at 25

DC Performance Insulation Resistance (between any two points):

>5x10

Ω at 40°C, 95% RH

>5x10

Ω at 25°C, 40% RH

Maximum Thermal Offset per Channel:

µV (differential H-L)

AC Performance Minimum Bandwidth (-3dB, 50 W source/load):

2-Wire m ode (4x16): >10 MHz 1-Wire m ode (1x128): >3 MHz

Open Channel Capacitance

(channel to channel, channel to common): 2-Wire m ode (4x16): <30 pF 1-Wire m ode (1x128): <380 pF

rms

(Vmax<30Vdcor250V

rms

(Vmax<133Vdcor150V

rms

C, 25% RH)

rms

)

rms

)

Maximum Voltage Terminal to Chassis:

220 Vdc; 250 Vac

Maximum Power per Channel:

rms

40VA

Closed Channel Resistance:

<1.5

Ω initially

Ω at end of relay life

<3.5

Crosstalk Between Channels @10 kHz:

2-Wire mode (4x16): <-90 dB 1-Wire mode (1x128): <-60 dB

Closed Channel Capacitance (Hi-Lo, Lo-Chassis):

2-Wire mode (4x16): 650/700 pF

General Module Size / Device Type:

C-size VXIbus, Register based

Relay Life:

@ No Load: 5x10 @ Full (rated) Load: 10

Terminals:

Screw type, maximum wire size 16AWG

1 Relays are subject to normal wear-out based on the number of operations.

Operations

Power Requirements:

Voltage: +5 V Peak Module Current (A) 0. 10 0.13 Dynamic Module Current (A) 0.10 0.02

Watts/slot:

5.0

Cooling/slot:

0.08 mm H

Operating Temperature:0° -55°C Operating Humidity: 65% RH, 0° -40°C Net Weight (kg): 1.6

Appendix A

+24 V

0 @ 0.42 Liter/sec

Relay Multiplexer Specifications 97

Notes:

98 Relay Multiplexer Speci fica tions

Appendix A

About This Appendix

This appendix contains information fo r register-based programming of the E1460A Relay Multiplexer module, including:

• RegisterAddressing.................................99

• RegisterDescriptions...............................102

• ProgrammingExamples.............................107

Register Addressing

The E1460A Relay Multiplexer m odule is a register-based module that does notsupportthe VXIbus word serial protocol. When a SCPI comm and is sent tothe m ultiplexer,the E 1406A Command programs the multiplexer at the register level.

Appendix B

Module parses the command a nd

Register-based programming is a series of reads and writes directly to the multiplexer registers. This increas es throughput speed since it eliminates command parsing and allows the us e of an embedded controll er. Also, if slot 0, the resource man ager, and the computer (GPIB) interface are provided by other devices, a C-Size system can be down size d by removing the command module.

Register addresses for register-based devices are located in the upper 25% ofVXI A16 address space. Every VXI device (up to 256 devices) is allocated a 32 word ( 64-by te) block of addresses . With twelve registers, the E1460A multiplexer uses twelve of the 64 addresses allocated.

Figure B-1 s hows the register address location within A16 as it might be mapped by an embedded c ont roller. Figure B- 2 shows the location of A16 address space in the E1 406A com mand module.

The Base Address When you are reading or writing to a multiplexer register, a hexadecimal or

decimal register address is specified. This address consists of a base address plus a register offset. The base address used in register-based programming depends on whether the A16 address space is outside or inside t he co mmand module.

Appendix B

A16 Address Space

Outside the Command

Module

When the E1406A command module is not part of your VXIbus system (see Figure B-1), the multiplexer’s base address is computed as shown where "16" at the end of the address indicates a hexadecimal numb er.

FFFF

COOO

OOOO

A16

ADDRESS

SPACE

C00016 + (LADDR * 64)

or 49,152 + (LADDR * 64)

where C00016(49,152) is the starting location of the register addresses, LADDR is themultipl exe r’s logical add re ss, and 64 is the numb er of address logical address is 112 (70

). Ifthis address is not changed, the multiplexer

will have a base address of:

C000

+ ( 112 * 64)16= C 00016+1C0016= DC00

49,152 + (112 * 64) = 49,152 + 7168 = 56,320

FFFF

ADDRESS

SPACE

C000

(49,152)

OFFSET

A16 REGISTER MAP

16-BIT WORDS

Bank 9 Control Register Bank 7 Control Register Bank 6 Control Register Bank 5 Control Register Bank 4 Control Register Bank 3 Control Register Bank 2 Control Register Bank 1 Control Register Bank 0 Control Register

Status/Control Register

Device Type Register

ID Register

E1460A

Figure B-1. Registers Within A16 Address Space (Outside the Command Module)

100 Register-Based Programming

BaseAddress = COOO

+ ( Logical Address 64)

49,152 + (Logical Address 64)

Appendix B

Agilent E1460A User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

AGILENT TECHNOLOGIES WARRANTY STATEMENT

Safety Symbols

WARNINGS

DECLARATION OF CONFORMITY

Using This Chapter

Multiplexer Description

Control Relays In addition to the channel switching relays, the switch card contains seven

Configuring the Multiplexer

• Warnings and Cautions

Configuring Terminal Modules

Programming the Multiplexer

Initial Operation You can us e th e following example program to verify initial multiplexer

Using This Chapter

Multiplexer Commands/States

Switching Channels

Scanning Channels

Miscellaneous Multiplexer Functions

• Using the Scan Complete Bit

About This Chapter

Command Types

Linking Commands Linking IEEE 488.2 Common Commands with SCPI Com mands. Use a

SCPI Commands Reference

ABORt

ARM:COUNt

ARM:COUNt?

INITiate

INITiate:CONTinous

INITiate:CONTinuous?

INITiate[:IMMediate]

OUTPut

OUTPut:ECLTrgn[:STATe]

OUTPut:ECLTrgn[:STATe]?

OUTPut[:EXTernal][:STATe]

OUTPut[:EXTernal][:STATe]?

OUTPut:TTLTrgn[:STATe]

OUTPut:TTLTrgn[:STATe]?

[ROUTe:]

[ROUTe:]CLOSe

[ROUTe:]CLOSe?

[ROUTe:]FUNCtion

[ROUTe:]FUNCtion?

[ROUTe:]OPEN

[ROUTe:]OPEN?

[ROUTe:]SCAN

[ROUTe:]SCAN:MODE

[ROUTe:]SCAN:MODE?

[ROUTe:]SCAN:PORT

[ROUTe:]SCAN:PORT?

STATus

STATus:OPERation:CONDition?

STATus:OPERation:ENABle

STATus:OPERation:ENABle?

STATus:OPERation[:EVENt]?

STATus:PRESet

SYSTem

SYSTem:CDEScription?

SYSTem:CPON

SYSTem:CTYPe?

SYSTem:ERRor?

TRIGger

TRIGger[:IMMediate]

TRIGger:SLOPe

TRIGger:SLOPe?

TRIGger:SOURce

TRIGger:SOURce?

IEEE 488.2 Common Commands Reference

SCPI Commands Quick Reference

About This Appendix

Register Addressing

The Base Address When you are reading or writing to a multiplexer register, a hexadecimal or