Tektronix 5802 Instruction Manual

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Model 5802

IEEE-488 Interface

Instruction Manual

Contains Operating and Servicing Information

WARRANTY

Keithley Instruments, Inc. warrants this product to be free from defects in material and workmanship for a period of 1 year from date of shipment.

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

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

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

LIMITATION OF WARRANTY

This warranty does not apply to defects resulting from product modification without Keithley’s express written consent, or misuse of any product or part. This warranty also does not apply to fuses, software, non-rechargeable batteries, damage from battery leakage, or problems arising from normal wear or failure to follow instructions.

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

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

Model 5802 IEEE-488 Interface

Instruction Manual

0 1985, Keithley Instruments, Inc.

Test Instrumentation Group

Cleveland, Ohio, U.S.A.

July 1987, Second Printing

Document Number: 5802-901-01 Rev. 6

Safety Precautions

The following safety precautions should be observed before using this product and any associated instrumentation. Although sane instruments and accessories would normally be used with non-hazardous voltages, there are situations where hazardous conditions may be present.

This product is intended for use by qualified personnel who recognize shock hazards and are familiar with the safety pre-

cautions required to avoid possible injury. Read the operating

information carefully before using the product.

Exercise extreme caution when a shock hazard is present. Lethal voltage may be present on cable connector jacks or test fixtures. The American National Standards Institute (ANSI) states that a shock hazard exists when voltage levels greater than 3OV RMS, 42.4V peak, or 60VDC are present. A good safety practice is to expect that hazardous voltage is present in any unknown circuit before measuring.

Before operating an instrument, make sure the line cord is connected to a properly grounded power receptacle. Inspect the connecting cables, test leads, and jumpers for possible wear, cracks, or breaks beforr each use.

For maximum safety, do not touch the product, test cables, or any other instruments while power is applied to the circuit under test. ALWAYS remove power from the entire test system and discharge any capacitors before: connecting or disconnecting cables or jumpers, installing or removing switching cards, or making internal changes, such as installing or removing jumpers.

Do not touch any object that could provide a current path to the common side of the circuit under test or power line

(earth) ground. Always make measurements with dry bands

while standing on a dry, insulated surface capable of with-

standing the voltage being measured.

Do not exceed the maximum signal levels of the instruments and accessories, as defined in the specifications and operating information, and as shown on the instrument or test fixture rear panel, or switching card.

Do not connect switching cards directly to unlimited power circuits. They are intended to be used with impedance limited sources. NEVER connect switching cards directly to AC main. When connecting sources to switching cards, install protective devices to limit fault current and voltage to the card.

When fuses are used in a product, replace with same type and rating for continued protection against fire hazard.

Chassis connections must only be used as shield connections for measuring circuits, NOT as safety earth ground connections.

If you are using a test fixture, keep the lid closed while power is applied to the device under test. Safe operation requires the use of a lid interlock.

If a @screw is present on the test fixture, connect it to safety earth ground using #18 AWG or larger wire.

The $ symbol on an instrument or accessory indicates that 1OOOV or more may be present on the terminals. Refer to the product manual for detailed operating information.

Instrumentation and accessories should not be connected to humans.

Maintenance should be performed by qualified service personnel. Before performing any maintenance, disconnect the line cord and all test cables.

SPECIFICATIONS/5802

ANALOG OUTPUT LEVEL: 1” = 10,cal CO”“tS 0” Xl gain.

1” = 100 Counts on Xl00 gain,

Maximurn output voltage = *‘iv.

ACC”RACY: *(0.25% 0, displayed reading +*r”“)~ In x100. 2mV

output = 0.2 displayed aunts.

:EEE-488 BUS IMPLEMENTATION

RESPONSE TIME: FdlOWS d,splay cnnversion rate,

OUTPUT RESISTANCE: 1OOOn~ ISOLATION: ANALOC; OUTPUT LO is connected to ,EEE COM-

MON. Maximum cwnmo” mode voltage from IEEE COMMON to

earth ground is 3W rms al dc. 50 or 6011~~

.l”l.T,LINE COMMANDS: DCL. SK, GET. GTL. UNT. UNL.

WE. 3’“. LLO,

lN,L,NE COMMANDS: IFC, EN, EOI, SRQ, ATN,

NTERFACE FUNCTIONS: SHl. AH,. T5, TEO. L4. LEO, SRI. RLO.

PPO. DC,, DT,, CU. El.

‘ROCRAMMABLE PARAMETERS: Range. DRY CIRCUIT

TEST,Operate, RELative. POLARITY, DRIVE. TRlCger. Calibra-

tian. EOI, SRQ. Status. Data Format. Terminatar~

,E”,CE-DEPENDENT COMMANDS:

RANGE:

;: R-3 20 n 114 200 n R5 2k n Rb 2Ok n R7 200k n

RELATIVE:

ZO = REL ofi Z, = REL on

OPERATE:

0” = STBY (Standby1 0, = OPR (Operatv)

POLARITY:

PO = FOL + Pi = I’OL -

DRIVE:

DO = DRIVE (puked) D, = DRIVE

DRY ClRCUIT TEST:

CO = NON DRY CIRCUIT TEST C, = DRY CIRCUIT TEST

D,G,TAL CALIBRATION:

v * n.nn,,,,~ * nn = enter calibratiun value.

STORE:

LO = Store calibration constants.

NON

DRY CIRCUIT

TEST

A”to

2”“rnII

2 R

(dc)

DRY CIRCUIT

TEST

Auto

2OOmll

2 0 20 0 20 0 20 n 20 0 20 0

TRIGGER:

TO = Continuous on Talk T, = One-shot on Talk T2 = Continuous ~1” GET T3 = O”e~shr,t <>n GET T4 = Cantinuous on X TZ = One-shut on X

EXECUTE:

X = Exerute drviwdcprndent cwnmands

EO,:

KO = EOI Enabled K1 = EO, “isabied

STATUS WORD:

ti” = Ourput status word,

DATA FORMAT:

GO = Readings and status word with preiix C, = Readings and status word withut pretix

SRQ:

MO = Clear SRQ Data Mask MI = Reading Overthn% MS i Reading D”“r M9 = Reading Done or Reading Ovcrfh

Ml6 = BUS)

M,, = Busy ,,T Reading Overflw M24 = Busy or Reading Dane M25 = Busy. Reading hne i)r Reading Overflw M32 = Clear SRQ Ermr Mask M33 = IDDCO M34 = IDDC M3S = ,DDC or IDDCO M36 = Not in Remote ,437 = Not in Remok or ,DDCCl

M3X = Not in Rem<>tr or ,D,,C

M39 = Not in Remote. lDDC or (“DC0

TERMINATOR:

Y(ASC,I) = ASCII Character

Y(LF) = CR LF Y(CR) = LF CR Y(DEL, = None

T,ME FROM TRlGGER TO FlRST BYTE OUT: 350”~s 10 500ms.

ADDRESS MODES: Taik Only. Addressable

DATA FORMAT AND STATUS BYTE OUTPUT

DATA FORMAT: STATUS BY-I-E OUTPUT:

TERMINATOR I

EXPONENT

PREF’X -FL u-l

N + DP + I.23456 E + 2 ,cR)(LF,

(pulsed)

D = DRIVE S=STANDBY J L N = NORMAL O=OVERFLOW D=DRY

Z = RELATIVE CIRCUIT TEST

DRY CIRCUIT TEST: N = NON DRY

POLARITY: + = POL +

- =POL -

id4

CIRCUIT TEST

580 D P C 0 R Z K T Md Me H Y

RELATIVE

TRIGGER

SRQ ON DATA

SRQ ON ERROR

LINE FREQUENCY A

TERMINATOR

PREFIX DRIVE POLARITY

DRY CIRCUIT TEST OPERATE RANGE

EOI

TABLE OF

SECTION l-GENERAL INFORMATION

CONTENTS

1.1

1.2

1.3

1.4

1.5

1.6 USING THE INSTRUCTION MANUAL

1.7

1.8 UNPACKING AND INSPECTION..

INTRODUCTION INTERFACE FEATURES WARRANlY INFORMATION MANUAL ADDENDA SAFETY SYMBOLS AND TERMS

SPECIFICATIONS

......

SECTION 2-AN OVERVIEW OF THE IEEE-488 BUS

2.1 INTRODUCTION

2.2

2.3 IEEE-488 BUS LINES

2.3.1 BusManagement Lines

2.3.2 Handshake Lines

2.3.3 Data Lines

2.4 BUS COMMANDS

2.4.1

2.4.2

2.4.3 Addressed Commands

2.4.4 Unaddressed Commands

2.4.5 Device-Dependent Commands

2.5

2.6 COMMAND SEQUENCES

2.6.1 Addressed Command Sequence

2.6.2

2.6.3 Device-Dependent Command Sequence ......................................................

BUS DESCRIPTION

UniIine Commands Universal Commands

COMMAND CODES

Universal Command Sequence

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

......

..,...

1-l 1-l 1-l 1-l 1-l 1-l l-2

l-2

2.1 2-l 2-2 2-2 2-2 2-3

2.3 2-4 2-4

2-5 2-5 2-5

2.5 2-7

2-8 2-8

SECTION 3-SYSTEM CONFIGURATION

3.1 INTRODUCTION

3.2 HARDWARE CONSIDERATIONS .............................................................

3.2.1 Typical Systems

3.2.2 Bus Connections

3.2.3 Primary Address Selection..

3.3

3.3.1 Controller Interface Routines

3.3.2 HP-85BASIC Statements

3.3.3 InterfaceFunction Codes ....................................................................

3.3.4 Interface Commands

SOFTWARE CONSIDERATIONS .............................................................

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

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

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

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

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

3-l 3-l 3-l 3-2

3-4 3-5

3-5 3-5

3-6 3-7

SECTION 4-OPERATION

4.1

4.2

4.2.1

4.2.2

4.2.3 i.2.4

4.2.5

4.2.6

4.2.7

4.3

4.3.1

4.3.2

4.3.3

4.3.4

4.3.5

4.3.6

4.3.7

4.3.8

4.3.9

4.3.10

4.3.11

4.3.12

4.3.13

4.3.14

4.3.15

4.4

INTRODUCTION ..............

GENERAL BUS COMMANDS

REN (Remote Enable). ........

IFC (Interface Clear) ..........

GTL (Go To Local) ...........

LLO (Local Lockout). .........

DCL (Device Clear). ..........

SDC (Selective De&ce Clear) Serial Polling (SPE, SPD)

DEVICE-DEPENDENT COMMAND PROGRAMMING..

Execute(X) ..........................

Range (R) ...........................

Operate/Standby (0) .................

Dry Circuit Test (C) ..................

Relative (2). .........................

Digital Calibration (V) and Storage (L)

Polarity (P) ..........................

Drive (D) ............................

Triggering (T) ............................

EOI (K) .................................

SRQ Mode (M) and Status Byte Format ....

Status Word (U) or Alternate Output ......

Prefix(G)

Programmable Terminator (Y) .............................................................. 4-14

Data Format .............................................................................. 4.14

TALK ONLY OPERATION ..................................................................

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

.......

......

..........

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

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

......

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

4-b

4-6 4-6 4-6 4-7 4-7 4-8 4-8 4-8 4-8

4-9 4-13 4-13

4.15

SECTION 5-ANALOG OUTPUT

5.1

5.2

5.3

5.4

INTRODUCTION ............................................................................

USING THE ANALOG OUTPUT .............................................................

OUTI’UTRESISTANCE ......................................................................

Xl00 RESOLUTION AND ACCURACY

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

SECTION 8-PRINCIPLES OF OPERATION

6.1

6.2

6.2.1

6.2.2 Digital Circuitry..

6.2.3

INTRODUCTION ............................................................................

CIRCUIT DESCRIPTION .....................................................................

Power Supply .............................................................................

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

Analog Output .............................................................................

SECTION 7-MAINTENANCE

7.1

7.2

7.3

7.3.1

7.3.2

7.3.3

7.3.4 Calibration. ................................................................................

7.4 SPECIAL HANDLING OF STATIC-SENSITIVE DEVICES

7.5 TROUBLESHOOTING

INTRODUCTION ............................................................................

INSTALLATION .............................................................................

CALIBRATION ..............................................................................

Warm Up .................................................................................

Recommended Calibration Equipment ........................................................

Environmental Conditions ..................................................................

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

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

5-l

5-3

b-1

6-l

6-2

7-l

7-3

SECTION 8--REPLACEABLE PARTS

8.1

8.2

8.3

8.4

8.5

INTRODUCTION ............................................................................

REPLACEABLE PARTS. ORDERING INFORMATION FACTORY SERVICE SCHEMATIC DIAGRAMS AND COMPONENT LOCATION DRAWINGS

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

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

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

8-l 8-l 8-1 8-l

........................ 8-1

iii

LIST OF TABLES

SECTION 2-AN OVERVIEW OF THE IEEE-488 BUS

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

IEEE-488 Bus Command Summary .,,,...,,.._...,,,.,..,,,._..................,,............. 2-4

Hexadecimal and Decimal Command Codes.. 2-7 Typical Addressed Command Sequence.. 2-8 Typical Device-Dependent Command Sequence 2-8

SECTION 3-SYSTEM CONFIGURATION

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

IEEE-488 Contact Designations Primary Address Switch Positions HP-85 IEEE-488 BASIC Statement Interface Function Codes IEEE-488 Command Groups

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

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

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

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

SECTION 4-OPERATION

4-l 4-2 4-3 4-4 4-5 4-6

GeneralBus Commands Default Values (Status Upon Power Up or After SDC or DCL). Device-Dependent Command Summary RangeCommands SRQMask Commands Status Byte and Mask Interpretation

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

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

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

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

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

SECTION t&ANALOG OUTPUT

5-l AnalogOutputParameters....................................................................

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

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

3-3 3-4

3-6 3-7 3-7

4-l 4-4

4-5 4-6 4-9

4-10

5-3

SECTION 7--MAINTENANCE

7-1 Static SensitiveDevices.......................................................................

7-2 Model5802InterfaceChecks..................................................................

SECTION 8-REPLACEABLE PARTS

8-l

Model5802Parts List _...._.........................._.,.,.___.,...._.._.__._................ 8-2

7-3 7-4

LIST OF ILLUSTRATIONS

SECTION 2-AN OVERVIEW OF THE IEEE-488 BUS

2-l 2-2 2-3

IEEE-488 Bus Configuration ...... .. ......................... ..................... 2-l

Handshake Sequence

Command Codes ............ _......

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

SECTION 3-SYSTEM CONFIGURATION

3-l SystemTypes 3-2 IEEE-488 Connector 3-3 IEEE-488 Connections 3-4 3-5 3-6 3-7

Contact Assignments Rear Panel of Model 580 Showing IEEE-488 Connections and Switches Typical IEEE-488 Bus Drive (one of 16). Primary Address Switch (Address 25 Shown)

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

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

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

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

SECTION 4-OPERATION

4-l Status Byte Format 4-2 4-3

General Format for UO Command Data Format

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

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

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

SECTION 5-ANALOG OUTPUT

5-l 5-2 5-3

Analog Output Connections

Xl Analog Output ........................................................................... 5-2

XlOOAnalog Output .._ ...................................................................... 5-3

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

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

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

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

2-3 2-6

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

4-10 4-11 4-14

5-l

SECTION 6-PRINCIPLES OF OPERATION

6-l 6-2 6-3

Simplified Block Diagram.. ................................................................... 6-l

Memory Map

Xland Xl00 Gains ........................................................................... 6-3

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

SECTION 7-MAINTENANCE

7-l

Model 5802 Installation

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

SECTION 8-REPLACEABLE PARTS

8-l

8-2

Model 5802 Interface, Component Location Drawing, Dwg. No. 5802-100 Model 5802 Interface, Schematic Diagram, Dwg. No. 5802-106

6-2

7-2

......................... 8-4

................................... 8-5

SECTION 1

GENERAL INFORMATION

1.1 INTRODUCTION

The Model 5802 is an IEEE-488 interface for the Model 580 Micro-ohmmeter. This interface, which includes analog output, adds extra versatility to the Model 580 by allowing the transmission of data and commands over the IEEE-488 bus. The interface provides all the necessary logic to interface the Model 580 to the bus using standard IEEE-488-1978 protocol.

1.2 INTERFACE FEATURES

Important IEEE-488 interface features:

l With the Model 5802 installed, the Model 580 is able to

communicate with other insrmmentation using the same IEEE-488s1!778 standards.

l A standard IEEE-488 connector that provides easy con-

nection to the IEEE-488 bus.

l An easily-changeable primary address. Although the

Model 580 is shipped from the factory with a primary address of 25, the customer can change it by using the five rear panel address switches.

l All Model 580 operation is supported by IEEE-488 pro-

gramming. In addition, numerous other IEEE-488 commands add operating features not available from the front pSW1.

1.4 MANUAL ADDENDA

Information concerning improvements or changes to the instrument which occur after the printing of this manual may be found on an addendum included with this manual. Review these changes before programming the Instrument.

1.5 SAFETY SYMBOLS AND TERMS

The following safety symbols and terms are used in this manual and may be found on the instrument.

The A symbol on the instrument indicates that the user should refer to the operating instructions.

Information associated with the WARNING heading explains dangers that could result in personal injury or death.

Information following the CAUTION heading explains hazards that could damage the instrument.

1.6 USING THE INSTRUCTION MANUAL

1.3 WARRANTY INFORMATION

Warranty information may be found on the inside front cover of this manual. Should it become necessary to exercise the warranty, contact your Keithley representative or the factory to determine the proper course of action. Keithley Instruments, Inc. maintains service facilities in the United States, the United Kingdom and throughout Europe. Addresses for these facilities may be found inside the front cover of this manual. Information concerning the application, operation or service of your instrument may be directed to the applications engineer at any of these locations.

This manual contains all the information you need to con- nect the Model 5802 to the IEEE-488 bus and program the instrument from a separate bus controller.

The manual is divided into the following sections:

1. Section 2 contains a general description of the IEEE-488 bus and its commands.

2. Section 3 contains information necessary to connect the instrument to the bus and set the primary address.

3. Section 4 contains the bulk of the programming information. General bus commands as well as commands unique to the Model 5802 are covered in detail.

1-l

4. Section 5 explains the analog output feature of the Model 5802.

5. Section 6 contains Principles of Operation.

6. Section 7 contains maintenance information such as installation and troubleshooting.

7. Section 8 contains replaceable parts information and applicable schematics and component layouts.

and electrically before shipment. When the Model 5802 arrives, carefully unpack all items and check for any obvious signs of damage.

Report any damage to the shipping agent immediately. Retain and use the original packing material in case reshipment is necessary. The following items are shipped with every Model 5802 order:

1.7 SPECIFICATIONS

A complete list of IEEE-488 specifications can be found preceding this section.

1.8 UNPACKING AND INSPECTION

The Model 5802 was carefully inspected both mechanically

Model 5802 IEEE-488 Interface Hardware necessary for installation

Model 5802 Instruction Manual

Additional accessories as ordered

If you need another manual, order the manual package

(Keithley Part No. 5802-901-01). This package includes an

instruction manual and any pertinent addenda.

l-2

2.1 INTRODUCTION

SECTION 2

AN OVERVIEW OF THE IEEE-488 BUS

The IEEE-488 bus is an instrumentation data bus adopted by the IEEE (Institute of Elechical and Eleckonic Engineers) in 1975 and given the IEEE-488 designation. The most recent revision of bus standards was made in 1978; hence the complete description for current bus standards is the IEEE-488-1978 designation.

The information presented here is not an elaborate description of a complicated set of standards. Rather, this section briefly describes general bus structure including a bus command outline. Complete IEEE-488 bus information is available from the IEEE and other sources.

2.2 BUS DESCRIPTION

The IEEE-488 bus is a parallel data transfer medium that optimizes data transfer without using an excessive number of bus lines. The bus has only eight data lines, used for data and certain commands. In addition, the IEEE-488 bus employs eight signal lines, including five bus management lines and three handshake lines. Since the bus is of pamlIe design, all devices connected to the bus have the same in-

formation available simultaneously. Each device processes

information received from the bus depending on its

capabilities.

TO OTHER DEVlCES

/ * \

DATA BYTE

TRANSFER

CONTROL

INTERFACE

HANDSHAKE

A typical bus configuration for controlled operation is

shown in Figure 2-l. A typical system has one controller and one or more instruments that receive commands and

which usually yield data.

BUS

MANAGEMENT

Figure 2-1. IEEE-488 Bus Configuration

2-1

AN OVERVIEW OF THE IEEE-488 BUS

Three categories described device operation: controller, talker, and listener. The controller regulates other devices on the bus, the talker sends data, and the listener receives data. A particular device may be a talker only or both a talker and a listener. A system can have only one controller (although control may be passed on to an appropriate device through a special command). Several talkers and listeners may be present depending on the bus’s capabilities.

The bus is limited to 15 devices including the controller. The maximum cable length is 20m.

Several devices may listen simultaneously, but only one device at a time may be a talker. Otherwise, communication would be garbled.

Before a device can be a talker or a listener, it must be appropriately addressed. Devices are selected according to their primary address; the addressed device is sent a talk or listen command derived from its primary address. Each device on the bus has a unique address so that each may be addressed individually.

ATN (Attention)-The ATN line is an important management line. ATN line status indicates if controller information on the data bus is to be considered data (set high false) or a multiline command (set low).

IFC (Interface Clear)-The IFC line, set true (low), sends the bus to a known state by sending the IFC command.

REN (Remote Enable)-The REN line, set low, sets up in- struments on the bus for remote operation.

EOI (End or Identify)-The EOI line, set low, sends the command to terminate a multi-byte transfer sequence.

SRQ (Service Request)-The SRQ line is set low by a device when it requires service from the controller.

2.3.2 Handshake Lines

The bus uses three handshake lines that operate in an interlocked sequence. This method ensures reliable data transfer regardless of the transfer rate. Generally, the slowest active device on the bus determines the data transfer rate.

Once a device is addressed to talk or listen, appropriate bus transactions take place. For example, if an instrument is addressed to talk, it sends its data to the bus one byte at a time. The listening device reads this information, and the appropriate software is then used to channel the information to the desired location.

2.3 IEEE-488 BUS LINES

Three types of signal lines are found on the IEEE-488 bus lines: data lines, which handle bus information, and handshake and bus management lines, which ensure proper data transfer and bus operation. Each of these bus lines is “active low” so that approximately zero (0) volts is a logic one (1). The following paragraphs describe the purpose of these lines, which are illustrated in Figure 2-l.

2.3.1 Bus Management Lines

The bus management group includes five signal lines that ensure orderly data transfer. These lines send the uniline commands described in paragraph 2.4.1.

Of the three bus handshake lines, the data source controls one and the accepting device controls the other two. The handshake lines are:

DAV (Data Valid)-The source controls the state of the DAV line.

NRFD (Not Ready For Data)-The acceptor controls the state of the NRFD line.

NDAC (Not Data Accepted)--The acceptor controls the state of the NDAC line.

Figure 2-2 illustrates the complete handshake sequence for one data byte. Once data is on the bus, the source confirms that NRFD is high, indicating that all devices on the bus are ready for data. Simultaneously, NDAC is low from the previous byte transfer. If these conditions are not met, the source must wait until the NRFD and NDAC lines have the correct status. If the source is a controller, NRFD and NDAC must remain stable for at least 1OOnsec after ATN is low. Some controllers have time-out routines to display error messages if the handshake sequence stops for any reason to reduce the possibility of bus hang-up.

2-2

DATA

DAV

SOURCE

AN OVERVIEW OF THE IEEE-488 BUS

DAV line high, indicating bus data is invalid, and the NDAC line returns to its low state. Finally, each of the devices releases the NRFD line at its own rate until it goes high when the slowest device is ready. The bus is then set

to repeat the sequence with the next data byte.

MRFD

NOAC

VALlD

I I I I I I I I

DAiA

TRANSFER

BE61N

1 I

OAt A

TRANBFER

END

ACCEPTOR

Figure 2-2. Handshake Sequence

Once the NRFD and NDAC lines are properly set, the source sets the DAV line low (data on the bus is now valid). The NRFD line then goes low, and the NDAC line goes high after all devices on the bus have accepted the data. Each device releases the NDAC line at its own rate. The NDAC line will not go high until the slowest device has accepted the data byte.

After the NDAC line goes high, the source then sets the

2.3.3 DBtB Lines

The IEEE-488 bus uses eight data lines that allow data to be transmitted and received in a bit-parallel, byte-serial manner. The eight lines are labeled DIOl through DI08, are bidirectional and, as with the remaining bus signal lines, low is true.

2.4 BUS COMMANDS

This section briefly describes the purpose of the bus commands that control communication between various instruments on the bus. The commands can be divided into

three categories.

Uniline Commands-Sent by setting the associated bus line low.

Multiline Commands-General bus commands which are sent over the data lines with the ATN line low.

Device-dependent Commands-Special commands that

depend on device configuration; sent over the data lines

with ATN high.

2-3

AN OVERVIEW OF THE IEEE-488 BUS

Table 2-1. IEEE-488 Bus Command Summary

-I-

Command Type

Uniline

Command

REN (Remote Enable)

EOI (End Or Identify) IFC (Interface Clear) ATN (Attention) SRQ (Service Request)

Multiline

Universal

DCL (Device Clear) WE (Serial Poll Enable) SI’D (Serial Poll Disable)

Addressed

SDC (Selective Device Clear) GTL (Go To Local) GET (Group Execute Trigger)

Unaddressed

UNL (Unlisten)

UNT (Untalk)

Device-dependent**

*X = Don’t Care

*‘See paragraph 4.3 for complete description.

State of

ATN Line*

X X

Low

Low Low Low Low Low Low Low Low

High

Comme”ts

Set up for remote operation. Sent by setting EOI’low Clear interface. Defines data bus contents. Controlled by external device.

Returns to default conditions. Enables serial polling. Disables serial polling. Returns unit to default conditions. Returns to local control,

Triggers device for reading.

Removes all listeners from bus. Removes all talkers from bus.

Commands for control of the

instrument.

-1

2.4.1 Uniline Commands

Uniline commands are sent by setting the associated bus line low. The ATN, IFC and REN commands are asserted only by the system controller. The SRQ command is sent by either the controller or an external device depending on the direction of data transfer. The following is a brief description of each command.

ATN (Attention)-Controller sets ATN when transmitting addresses or multiline commands. Device-dependent commands are sent with the ATN line high (false).

IFC (Interface Clear)-Clears the bus and sets devices to

a known state. Although device configurations differ, the

IFC command usually places instruments in the talk and

listen idle states.

REN (Remote Enable)-Sets instrument up for remote operation. The REN command should be sent before attempting to program the instruments over the bus.

EOI (End or Identify)-Positively identifies the last byte in a multi-byte transfer sequence, and allows variable length data words to be easily transmitted.

SRQ (Service Request)-Asserted by an external device when it requires service from the controller. A serial polling sequence, as described in Section 4, must be used in case of multiple devices to determine which device has requested service.

2.4.2 Universal Commands

Universal commands are multiline commands that require no addressing. All inshumentation equipped to implement the command will do so simultaneously when the command is transmitted over the bus. The universal commands, like all multiline commands, are sent over the data line with ATN low.

LLO (Local Lockout)-The LLO command is used to lock out front panel controls on devices so equipped.

DCL (Device Clear)-After DCL is sent, instrumentation equipped to implement the commands will revert to a known state. Usually, instruments return to their powerup conditions.

2-4

AN OVERVIEW OF THE IEEE-488 BUS

Sl’E (Serial Poll Enable)--The SPE command is the first step in the serial polling sequence. The serial polling sequence is used to determine which instrument has requested ser-

vice with the SRQ command.

SPD (Serial Poll Disable)-The SPD command is sent by the controller to remove all instrumentation from the serial

.poll mode.

2.4.3 Addressed Commands

Addressed commands are multiline commands that must be preceded by a listen command before the instrument will respond. The listen command is derived from the device’s primary address. Only the addressed device will respond to the following commands:

SDC (Selective Device Clear)-The SDC command is essentially identical to the DCL command except that only the addressed device responds. The addressed instrument usually returns to its default conditions when SDC is sent.

GTL (Go To Local)-The GTL command removes instruments from the remote operation mode. Also, front panel operation will usually be restored if LLO was already sent.

GET (Group Execute Trigger)-The GET command is used to trigger devices to perform a device-dependent action. Although GET is considered an addressed command, many devices respond to GET without being addressed.

2.4.4 Unaddressed Commands

The controller uses two unaddressed commands to

simultaneously remove all talkers and listeners from the bus. ATN is low when these multiline commands are asserted.

UNL (Unlisten)-All listeners are immediately removed from the bus when the UNL command is placed on the bus.

UNT (Untalk)-The controller sends the UNT command to clear the bus of all talkers.

2.4.5 Device-Dependent Commands

The instrument determines device-dependent command definition. Generally, these commands are sent as ASCII characters that tell the device to perform a specific func-

tion. For example, Zl places the instrument in the relative mode. For complete information on using these commands with the Model 5802, refer to Section 4. The IEEE-488 bus treats device-dependent commands as data with the ATN line high (false) when the commands are transmitted.

2.5 COMMAND CODES

Each multiline command has a unique code that is

transmitted over the bus as 7 bit ASCII data. This section

briefly explains the code groups which are summarized

in Figure 2-3. Every command is sent with ATN true.

2-5

AN OVERVIEW OF THE IEEE-466 BUS

2-6

Figure 2-3. Command Codes

AN OVERVIEW OF THE IEEE-466 BUS

Addressed Command Group (ACG)-Address commands

are listed in column O(8) in Figure 2-3. Column O(A) lists

the corresponding ASCII codes.

Universal Command Group (UCG)-Columns l(A) and l(B) list universal commands and the corresponding ASCII

codes.

Listen Address Group (LAG)-Columns 2(A) and 3(A) list the ASCII codes corresponding to the primaly addresses listed in columns 2(B) and 3(B). For example, if the primary address is set to l2, the LAG byte will correspond to an ASCII(,) command.

Talk Address Group (TAG)--TAG primary address values and the corresponding ASCII characters are listed in columns 4(A) through 5(B).

The preceding address groups are combined to form the Primary Command Group (KG). The bus also has another group of commands, the Secondary Command Group (SCG). These are listed in Figure 2-3 for reference only; the Model 5802 does not respond to these commands, although other devices may have secondary addressing capability.

NOTE

Commands are normally transmitted with the 7 bit code listed in Figure 2-3. The condition of D7 (D108) is usually unimportant, as shown by the

“Don’t Care” indication in the table. Some devices, however, may require that D7 assume a specific logic state before it recognizes commands.

Table 2-2. Hexadecimal and Decimal Command

Codes

Command Hex Value’

GTL

01 SDC 04 GET

08 DCL 14

WE 18 SPD 19 LAG 20-3F TAG 40-5F

UNL 3F UNT 5F

Decimal Value

32-63 64-95

8 20 24 25

63 95

*Values shown with D7 = 0

2.6 COMMAND SEQUENCES

The proper command sequence must be sent by the controller before an instrument will respond as intended. The universal commands such as LLO and DCL require only that ATN be set low before the command is sent. Other commands require that the device be addressed to listen first. This section briefly describes the bus sequence for several types of commands.

2.6.1 Addressed Command Sequence

Hexadecimal and decimal values for each of the commands or command groups are listed in Table 2-2. Each value in

the table assumes that D7 is set to 0.

Before a device will respond to one of these commands, it must receive a LAG command derived from its primary address. Table 2-3 shows a typical sequence for the SDC command. The LAG command assumes that the instrument is set at a primary address of 25 (11001).

2-7

AN OVERVIEW OF THE IEEE-488 BUS

Table 2-3. Typical Addressed Command Sequence

Data Bus

Step Command ATN State

UNL Set low

LAG* stays low

2 3 4

*Assumes primary address = 25

Note that an UNL command is transmitted before the

LAG, SDC sequence. This removes all other listeners from

the bus first so that only the addressed device responds.

SDC Stays low

Returns hiah

ASCII Hex Decimal

? 3F 9 39

EOT04

63 57

2.6.2 Universal Command Sequence

The universal commands are sent by setting ATN true and then placing the command byte on the bus. For example, the following gives the DCL command:

2.6.3 Device-Dependent Command Sequence

Device-dependent commands are transmitted with ATN false. However, the device must be addressed to listen first before the command is transmitted. Table 2-4 shows the

sequence for the following command:

z 1 ::.::

This command, which sets the Model 58015802 to the relative mode, is described in detail in Section 4.3.5.

Table 2-4. Typical Device-Dependent Command

Sequence

Data Bus

Step Command ATN State

UNL Set low

LAG* stays low

2 3 4 5

Data Set high Data Stays high Data Stays high

ASCII Hex Decimal

? 3F 9 39

z 5A

1 31

X 58

63 57 90

Note that both ATN and DCL are on the bus simultaneously. Also, addressing is not necessary.

*Assumes primary address = 25.

2-8

SECTION 3

SYSTEM CONFIGURATION

3.1 INTRODUCTION 3.2.1 Typical Systems

This section deals with important hardware and software The IEEE-488 bus is a parallel interface system. When more

aspects of IEEE-488 bus operation. devices are added, more cables are used to make the

desired connections. This flexible arrangement can accommodate simple to extremely complex systems.

3.2 HARDWARE CONSIDERATIONS

Before the Model 5802 can be used with the IEEE-488 bus,

the device must be connected to the bus with a suitable

connector. Also, the primary address must be selected, as

described in this section. And of course, the Model 5802 IEEE-488 interface must be installed in the Model 580. Refer to Section 7 for installation instructions.

tlOOEL 980

(A,) SIMPLE SYSTEM

Figure 3-l shows two typical system configurations. Figure bows two typical system configurations. Figure 3-1(A) shows the simplest possible controlled system. The YS the simplest possible controlled system. The controller sends commands to the instrument, which sends commands to the instrument, which sends data back to the controller. back to the controller.

CONTROLLER

CONTRoLLER

INSTRWENT

(El ADDITIONAL INSTRUHENTATlON

tlODEL 880

Figure 3-l. System Types

INSTRUMENT

3-1

SYSTEM CONFIGURATION

The system becomes more complex in Figure 3-1(B), where additional instrumentation is added. Depending on programming, all data may be routed through the controller, or transmitted directly from one instrument to another. For very complex applications, a much larger computer may be used. Tape drives or disks can then be used to store data.

INSTRUMENT

INSTRUMENT INSTRUMENT

3.2.2 Bus Connections

The Model 5802 is connected to the bus through an IEEE-488 connector, which is shown in Figure 3-2. This

connector can be stacked to allow a number of parallel con-

nections to one instrument.

CONTROLLER

Figure 3-3. IEEE-488 Connections

NOTE

The IEEE-488 bus is limited to a maximum of 15

devices. includine the controller. Also, the maximum cable length is 20 meters. F&&to observe these limits will probably result in erratic operation.

Custom cables may be constructed using the information in Table 3-l and Figure 3-4. Table 3-l lists the contact assignments for the various bus lines, while Figure 3-4 shows the contact designations. Contacts 18 through 24 are return lines for the indicated signal lines. The cable shield is connected to contact 12. Each ground line is connected to digital common in the Model 5802, but contact 12 within the instrument is left unconnected to avoid ground loops. Refer to Figure 3-5 to locate the connector on the rear panel of the Model 580.

Figure 3-2. IEEE-488 Connector

NOTE

To avoid possible mechanical damage, it is recommended that not more than three connectors be stacked on any one instrument. Otherwise the resulting strain may cause internal damage.

A typical connecting scheme for the bus is shown in Figure 3-3. Each cable normally has the standard IEEE-488 connector on each end. The Keithley Model 7008-6 cable, which is six feet long, is ideal for this purpose. Once the connections are made, the screws should be securely

tightened.

3-2

CONTACT 12

(

CONTACT I

(

----- -----

---_----_ _

7 2

CONTiCT 24

Figure 3-4. Contact Assignments

CONiACT 13

SYSTEM CONFIGURATION

Figure 3-5. Rear Panel of Model 580 Showing IEEE-488 Connections and Switches

Table 3-l. IEEE-488 Contact Designations

Contact IEEE-488

Number Desgination

DIOl D102 D103 D104

EOI (24)

7 8

9 10 11

l3 14 15 16 17 18 19

20 21

23 24

DAV

NRFD

NDAC

IFC

SRQ

ATN

SHIELD

D105 D106

D107 DI08

REN (24)’

Gnd, (6) Gnd, (7) Gnd, (8) Gnd, (9)*

Gnd, (IO)*

Gnd, (11)”

Gnd. LOGIC

Type

Data Data Data Data

Management

Handshake Handshake

Handshake Management Management Management

Ground

Data Data Data Data

Management

Ground Ground Ground Ground Ground Ground Ground

WARNING

The voltage between IEEE-488 common and

chassis ground must not exceed 30V or damage

to the instrument may occur.

A typical signal line bus driver is shown in Figure 3-6. With the configuration shown, the driver has bidirectional capability. When the I/O control line is high, the line is configured as an output line. When the control line is low, the driver is set up for input operation. Note that not all signal lines have bidirectional capability. Some lines, such as ATN, will always be configured as an output line in the controller and as an input line for all other devices on the bus.

*Numbers in parenthesis refer to signal ground retur:

of reference contact number. EOI and REN signal lines return on contact 24.

Figure 3-6. Typical IEEE-488 Bus Drive (one of 16)

”

3-3

SYSTEM CONFIGURATION

3.2.3 Primary Address Selection

The Model 5802 must receive a listen command before it will respond to addressed commands. Similarly, the in-

strument must receive a talk command before it will transmit its data string, status word or status byte. These listen and talk commands are derived from the instrw

ment’s primary address. The Model 5802 is shipped from the factory with a primary address of 25 (11001). The primary address may be reset to any value between 0 and 30 as long as address conflicts with other bus instruments are avoided. This may be done by placing the primary address switches, which are shown in Figure 3-7, in the desired position. Note that the primary address of the instrument must agree with the address specified in the controller’s programming language.

ANALOG OUTPUT

GAIN

TALK ONLY (TO) 1

..-

LSG MB

mwdi

I 2 3 4 5 6 7 0

XI.

ADDRESSABLE -

Figure 3-7. Primary Address Switch (Address 25

Shown)

NOTE

The primary address switch positions are read only upon power up. If the address is changed, the Model 580 must be turned off and then powered up again before the new address can be

used.

Table 3-2. Primary Address Switch Positions

Primary

Address

0 0

2 0 3 4 0

5 0 6 0

7 8 9

11 12 13 0 14 15 0 16 1 17 1 18 1 19 1

20 1 21 1 22 23 1 24 25 1 26 27 28 29 30

MSB

0 0 0 0 0 0

1 1

1 1 1

LSB

0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1

0 0 0 0 1 1 1

1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1

P-

0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1

1 0 0

0 1 0 1

1 0 1 0 1 0 1 0

1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0

Figure 3-7 shows the correct positions for the Model 5802 factory set value of 25 (11001). If a different address is required, the primary address may be changed as outlined in Table 3-2.

3-4

SYSTEM CONFIGURATION

NOTE

If other instrumentation is also connected to the

bus, be sure that each device has a different

primary address. If this precaution is not observed, erratic bus operation will result.

The primary address switches are binary weighted; Al is

the least significant bit, A5 is the most significant bit. For example, the binary value for the factory set primary address of 25 is 11001. Use the tip of a pencil to operate the switches.

NOTE Instruments should not be operated with a primary address of 31 (11111) even though it is possible to set the Model 5802 address to those positions. This address is reserved for the UNT and UNL commands; erratic operation may result if primary address 31 is used.

3.3 SOFTWARE CONSIDERATIONS

The necessary handler routines to operate the IEEE-488 bus are described in this section.

3.3.1 Controller Interface Routines

Before a controller can be used with the IEEE-468 interface, make certain that appropriate handler software is present within the controller. The HP-85 interface card for the HP-85 computer, for example, must be used with an additional 110 ROM, which contains the necessary handler

software.

Other small computers used as controllers have limited IEEE-488 command capability. The PETKBM computers are incapable of sending multiline commands from BASIC, although these commands can be sent through machine language routines. Other small computers’ capabilities depend on the particular interface being used. Often, little software “tricks” are required to achieve desired results.

Make sure the proper software is being used with the interface. Often, the user may suspect that hardware is causing a problem when it is actually the software causing the problem.

3.3.2 HP-85 BASIC Statements

Many of the programming instructions covered in Section 4 use examples written in Hewlett Packard Model 85 BASIC. The HP-85 was chosen for these examples because

it has a large number of BASIC statements that control IEEE-488 operation. This selection covers those HP-85

BASIC statements essential to Model 58015802 operation.

A list of HP-85 BASIC statements is shown in Table 3-3. All statements have a one or three digit argument that must be specified. The first digit is the HP-85 interface select code which is set to 7 at the factory. The last two digits of those statements that require a three digit argument specify primary address. Generally, only those commands that require an address to be sent over the bus require that the primary address be specified in the BASIC statement.

3-5

SYSTEM CONFlGURATlON

Table 3-3. HP-85 IEEE-488 BASIC Statement

statement

ABORT10 7 CLEAR 7 Send DCL. CLEAR 725 Send SDC to device 25. ENTER 725;A$

LOCAL 725

OUTPUT 725;A5 Device 25 addressed to listen.

REMOTE 7 Set REN true. REMOTE 725 RESET 7 SPOLL(725) Address device 25 to talk.

TRIGGER 7 TRIGGER 725 Address device 25 to listen.

Those statements in the table with three digit arguments assume that the primary address of the device is set at 25.

Other primary addresses require that the last two digits be set to the corresponding value. For example, to send a GTL command to device 25, the following BASIC statement would be used.

Action

Send IFC.

Device 25 addressed to talk. Data placed in A!$. Send GTL to device 25.

Transmit A$.

Send REN true. Address device 25 to listen Send IFC, cancel REN.

Conduct serial poll. Send GET

Send GET.

BUS Command Sequence

IFC ATN-DCL ATN*UNL;MTA;LAG;SDC ATN*UNL;MLA;TAG;ATN;data

ATN*UNL;MTA;LAG;GTL ATN*MTA;UNL;LAG;ATN;data

REN REN;ATNsL;MTA;LAG 1FC;REN;REN ATN*UNL;MLA;TAG;SPE;ATN; status byte;ATN*SPD;UNT ATN*GET ATN*UNL;MTA;LAG;GET

dresses sent by the HP-85 to facilitate bus operation in cer-

tain circumstances.

NOTE

The HP-85 address is set to 21 at the factory. Since each device on the bus must have a unique

primary address, do not set the Model 5802 to the

controller’s address.

Some of the statements in the table have two forms; the exact configuration used depends on the desired command. For example, CLEAR 7 will cause a DCL to be sent to all devices on the bus, while CLEAR 725 causes an SDC to be transmitted to device 25.

The third column of Table 3-3 lists command sequence mnemonics. While most of these are covered elsewhere, a couple of points should be noted. The ATN line is set low by the controller if the data bus contains a multiline command. This is indicated in the table by ANDing the ATN mnemonic with the first command on the bus. For example, ATN GET means that ATN and GET are sent simultaneously. Two commands not previously covered are

MTA (My Talk Address) and MLA (My Listen Address). These are ordinary PCG (Primary Command Group) ad-

3-6

3.3.3 Interface Function Codes

The interface function codes are part of the IEEE-488-1978

standards. These codes define an instrument’s ability to support various functions and should not be confused with programming commands found elsewhere in this manual.

Table 3-4. lists the codes for the Model 5802. These codes are also listed for convenience on the rear panel of the instrument immediately above the IEEE-488 connector. The numeric value following each one or two letter code defines Model 5802 capabilities as follows:

SYSTEM CONFIGURATION

Table 3-4. Interface Function Codes

Code

SHl AH1 l-5

SRl RLO IT0 DC1 lm co El TEO LEO

SH (Source Handshake Function)-The ability of the Model 5802 to initiate message/data transfer on the data bus is provided by SH function.

AH (Acceptor Handshake Function)-Guaranteed proper reception of message data on the data bus is provided by the AH function.

T (Talker Function)-The ability of the Model 5802 to send device-dependent data over the bus (to other devices) is provided by the T function. Model 5802 talker capability exists after the instrument has been addressed to talk.

L (Listener Function)-The ability of the Model 5802 to receive device-dependent data over the bus (from other devices) is provided by the L function. Listener function capability of the Model 5802 exists only after the instrument has been addressed to listen.

SR (Service Request Function)-The ability of the Model 5802 to request service from the controller is provided by the SR function.

RL (Remote Local Function)-The ability of the Model 5802 to be placed in the remote or local modes is provided by the RL function.

PP (Parallel Poll Function)-The Model 5802 does not have

parallel polling capabilities.

DC (Device Clear Function)-The ability of the Model 5802

to be cleared (initialized) is provided by the DC function.

Interface Function

Source Handshake Capability Acceptor Handshake Capability

Talker (Basic Talker, Serial Poll, Talk Only

Mode, Unaddressed To Talk On LAG) Listener (Basic Listener, Unaddressed To Listen On TAG) Service Request Capability No Capability No Parallel Poll Capability Device Clear Capability Device Trigger Capability No Controller Capability Open Collector Bus Driver No Extended Talker Capability No Extended Listener Capability

DT (Device Trigger Function)-The ability for the Model 5802 to have its basic operation started is provided by the DT function.

C (Controller Fun&m-The Model 5802 does not have controller capabilities.

TE (Extended Talker Capability)-The Model 5802 does not have extended talker capability.

LE (Extended Listener Capability)-The Model 5802 does

not have extended listener capability.

3.3.4 Interface Commands

Interface commands controlling Model 58015802 operation are listed in Table 3-5. Not included in the table are devicedependent commands, which are covered in detail in Section 4.

Table 3-5. IEEE-488 Command Groups

HANDSHAKE COMMAND GROUP

DAC=DATA ACCEFTED RFD=READY FOR DATA DAV= DATA VALID

UNIVERSAL COMMAND GROUP

ATN=ATTENTION DCL=DEVICE CLEAR IFC=INTERFACE CLEAR LLO=LOCAL LOCKOUT REN=REMOTE ENABLE SPD=SERIAL POLL DISABLE SI’E=SERIAL POLL ENABLE

ADDRESS COMMAND GROUP

LISTEN: LAG=LISTEN ADDRESS GROUP

MLA=MY LISTEN ADDRESS UNL=UNLISTEN

TALK: TAG=TALK ADDRESS GROUP

MTA=MY TALK ADDRESS UNT=UNTALK OTA=OTHER TALK ADDRESS

ADDRESSED COMMAND GROUP

ACG=ADDRESSED COMMAND GROUP GET=GROUl’ EXECUTE TRIGGER GTL=GO TO LOCAL SDC=SELECTIVE DEVICE CLEAR

STATUS COMMAND GROUP

RQS=REQUEST SERVICE SRQ=SERIAL POLL REQUEST

STB=STATUS BYTE

EOI=END

3-713-0

SECT

ON 4

OPER

4.1 INTRODUCTION

The Model 5802 is an IEEE-488 interface for the Model 580

Micro-ohmmeter. Since all IEEE-488 operation is done through commands given over the bus, IEEE-488 operation precludes the use of operating controls in the usual sense. Instead, all operating functions are controlled by programming.

This section describes important programming functions in detail Included are: general bus commands, devicedependent commands, status word and status byte, and other important information. The information presented in this manual assumes that the operator is familiar with all normal aspects of Model 580 operation. For information on front panel operation, refer to the Model 580 Operator’s Manual.

NOTE

mming examples in this section assume that

rrogra the Model 5802 primary address is set to 25. Those

examples with &dressed commands will not function unless the primary address of the instrument is set to that value. Refer to Section 3 for information on setting the primary address.

4.2 GENERAL BUS COMMANDS

General bus commands are those commands which have the same general meaning regardless of instrument configuration. These commands are grouped into two categories:

lTlON

General bus commands are summarized in Table 4-1, which also lists the HP-85 BASIC statement that sends each command. Each addressed command statement assumes a primary address of 25 (11001).

Table 4-1. General Bus Commands

L-

*GET may be sent with or without addressing

4.2.1 REN (Remote Enable)

The remote enable command is sent to the Model 5802 by the controller to set the instrument up for remote operation. Generally, this should be done before attempting to

program the instrument over the bus. The Model 58015802 indicates that it is in the remote mode by turning on the front panel RMT annunciator.

To place the Model 58015802 in the remote mode, the con-

troller must perform the following steps:

Addressed Commands-These commands require that the primary address of the instrument agrees with the primary address in the controller’s language.

Unaddressed Commands-No primary address is required for these commands. All devices equipped to implement these commands will do so simultaneously when the command is sent.

1. Set the REN line true.

2. Address the Model 58015802 to listen

4-1

OPERATION

NOTE

Setting the REN true without addressing will not cause the REMOTE indicator to turn on: however. once the REN is true, the REMOTE indicator turns on the next time an addressed command is re-

ceived.

P&ramming Example-This sequence is automatically sent by the HP-85 when the following is typed into the

keyboard.

After the END LINE key is pressed, the Model 580 REMOTE annunciator (RMT) should hnn on. If not, check to see that the instrument is set for the proper primary address. Also check to see that all the bus connections are tight.

4.2.2 IFC (Interface Clear)

The IFC command is sent by the controller to set the Model 58015802 to the talk and listen idle states.

1. Set ATN true.

2. Address the Model 580/5802 to listen.

3. Place the GTL command on the bus.

Programming Example-If the instrument is not in the remote mode, enter the following statements into the HP-85 computer:

Check to see that the RMT annunciator is on. The GTL command sequence is automatically sent by the HP-85 with the following statement:

Note that the remote (RMT) annunciator on the front panel turns off.

NOTE

Setting the REN line false with the LOCAL 7 statement will also take the instrument out of the remote mode

To send the IFC command, the controller need only set the IFC line true.

Programming Example-Before demonstrating the IFC command, turn on the front panel remote @MT) annunciator by entering the following statement into the HP-85 computer:

The front panel remote (RMT) annunciator should now be on. The IFC command can now be sent by typing in

the following statement:

After the END LINE key is pressed, the Model 58015802 is in the talk idle state. Note that the remote mode is not cancelled.

4.2.3 GTL (Go To Local)

4.2.4 LLO (Local Lockout)

The LLO command may be used to “lock out” front panel button control on the Model 580. Note that all devices on the bus equipped to respond to a LLO command will do so simultaneously. When the Model 58015802 receives a LLO command, the instrument will no longer respond to front panel buttons, but can still be controlled over the bus by the controller.

Programming Example-To put the instrument into local lockout, enter the following statement into the HP-85

controller:

Note that the RMT and LLO annunciators come on

To get out of local lockout and remote, type:

The GTL command is used to take the instrument out of the remote mode. To send the GTL command, the controller must perform the following sequence:

4-2

Both annunciators turn off

OPERATION

To stay in local lockout but get out of remote (go to

LOCAL), type:

Note that the RMT annunciator turns off, but LLO stays

on.

4.2.5 DCL (Device Clear)

The DCL command may be used to clear the Model 580, setting it to a known state. Note that all devices on the bus equipped to respond to a DCL will do so simultaneouslv. When the Model 58015802 receives a DCL command, it will return to the default conditions listed in Table 4-2.

To send a DCL command, the controller must perform the following steps:

1. Set ATN true.

2. Place the DCL command on the bus.

Programming Example-Using the front panel controls, select POLARITY and the 2012 range. Type in the following statement into the HP-85 computer:

Programming Example-Using front panel controls select DC drive. Enter the following statements into the HP-85 computer:

Note that the instrument did not respond to the SDC because the command was sent with a primary address of five. Now enter the following statement into the HP-85:

This time, the instrument returns to the default conditions listed in Table 4-2 (pulsed drive).

4.2.7 Serial Polling (SPE, SPD)

The serial polling sequence is used to obtain the Model 58015802 status byte. Usually, the serial polling sequence is used to determine which of several devices has requested service over the SRQ line. However, the serial polling sequence may be used at any time to obtain the status byte from the Model 58015802. For more information on status byte format, refer to Paragraph 4.3.11.

The serial polling sequence is conducted as follows:

When the END LINE key is pressed after the CLEAR 7 statement, the instrument returns to the default conditions listed in Table 4-2 (the POLARITY will return to its positive power up condition).

4.2.6 SDC (Selective Device Clear)

The SDC command performs the same function as the DCL command except that only the addressed device responds. This command is useful for clearing only a selected instrument instead of all instruments at once. The Model 580 returns to the default conditions listed in Table 4-2 when responding to a DCL command.

To transmit the SDC command, the controller must perform the following steps:

1. Set ATN true.

2. Address the Model 5802 to listen.

3. Place the SDC command on the bus.

The controller sets the ATN line true.

The SPE (Serial Poll Enable) command is placed on the bus by the controller.

The Model 58015802 is addressed to talk.

The controller sets ATN false.

The instrument then places its status byte on the bus

to be read by the controller.

The controkr sets the ATN line true and places the SPD

(Serial Poll Disable) on the bus to end the serial polling sequence.

Steps 3 through 5 may be repeated for other instruments on the bus by using the correct talk address for each instrument. ATN must be true when the talk address is transmitted and false when the status byte is read.

Programming Example-The HP-85 SPOLL statement automatically performs the serial polling sequence. Tu demonstrate serial polling, momentarily power down the instrument and power it up again. Enter the follo\~ing statement into the HP-85 computer:

4-3

OPERATION

When the END LINE key is pressed after the S=SPOLL statement, the computer performs the serial polling sequence. When the END LINE key is pressed after the DISP S statement, the status byte value (0) is displayed on the CRT. The status byte has a value of 0 with this example because no bits in the byte are set. Paragraph 4.3.11 covers the status byte format in detail.

Table 4-2. Default Values (Status Upon Power Up

or After SDC or DCL)

Mode

Range

Operate

Dry Circuit Test

Relative Calibration Polarity Drive

Trigger

EOI

SRQ

Alternate Output Prefix

Terminator

Value status

PO Positive

MO No SRQ

GO Send Prefix

Y(CR)(LF) Carriage Return, Line

Reflects front panel selection

Reflects front panel

selection Reflects front panel selection Off Off

Pulsed current Continuous on TALK EOI is transmitted on the last byte out

Standard output

Feed

1. Ignore the entire command string.

2. Set appropriate error bits in the status byte.

3. Generate an SRQ if programmed to do so.

These programming aspects are covered in paragraph

4.3.11. HP-85 examples are included throughout this section to clarify programming.

NOTE

Before starting a programming example, it is recommended that the instrument be set to its default values by sending a DCL over the bus. See paragraph 4.2.5 for information on using the SDC command.

If the HP-65 should become “hung up” at any point (due

to inadvertent command errors, etc.), operation may be

restored by holding down the SHIFT key and then pressing RESET on the keyboard.

In order to send a device-dependent command, the controller must perform the following sequence:

1. Set ATN true.

2. Set the REN line true.

3. Address the Model 58015802 to listen.

4. Set ATN false.

5. Send the command string over the bus one byte at a

time.

4.3 DEVICE-DEPENDENT COMMAND

IEEE-488 device-dependent commands are sent to the Model 58015802 to control its various operating modes. Each command is made up of an ASCII alpha character followed by one or more numbers designating specific parameters. For example, REL is programmed by sending an ASCII “Z” followed by a zero or one for turning it off or on. The IEEE-488 bus treats device-dependent commands as data in that ATN is high when the commands are transmitted.

A number of commands may be grouped together in one string. A command string is terminated by an ASCII “X”

which tells the instrument to execute the command string.

If an illegal command or command parameter is present within a command string the instrument will:

Programming Example-Device-dependent commands are sent by the HP-85 using the following statement:

A$ in this case contains the ASCII characters that form the command string.

NOTE

REN must be true when attempting to program the Model 580. If REN is false, the RMT annunciator will be off.

Commands that affect the Model 580 are listed in Table 4-3. All the commands listed in Table 4-3 are covered in detail in the following paragraphs.

NOTE

The programming examples that follow assume that the Model 58015802 primary address is at its factory setting of 25 (11001).

4-4

Table 4-3. Device-Dependent Command Summary

OPERATION

Store Calibration Constants Polarity

Jn,

EOI

SRQ

Command

RO Rl R2

iTi R6 R7

Cl zo

tn.nnnnE+nn

Ix PO

Dl To

Tl T2

M”“”

Bits:

MSB 7

6 5 4 3 2

LSB 0’

UO GO

Y(ASCII)

Y(DEL)

hcription

mplement all DDCs when an X is received. hn Dry Circuit Test

iuto !OOm

!OO

20 k

!OO k standby

3perate \Jon Dry Circuit Test

3ry Circuit Test XEL off

?.EL on Enter calibration. Calibration point equal to the input

:esistance. Store calibration constants and exit calibration.

P01+

PolPulsed Drive

DC Drive Continuous on Talk

One-shot on Talk Continuous on GET One-shot on GET Continuous on “X” One-shot on “X”

EOI is transmitted on the last byte out. EOI is not transmitted.

nnn = 0 to 255 base 10

N/A = Bit ignored

Data

N/A

SRQ

NORMAL=0 BUSY READING DONE

N/A N/A READING OVERFLOW

Output the status word on the next reading.

Send prefix. Do not send prefix.

ASCII character (CWLF)

(WKW No terminator

Dry Circuit Test Auto 200m

2 20 20 20 20

ElTlJr

N/A

SRQ

ERROR=1 N/A

N/A NOT IN REMOTE

IDDC IDDCO

, I

4-5

OPERATION

4.3.1 Execute (X)

The execute command is implemented by sending an ASCII “X” over the bus. Its purpose is to tell the Model 580/5802 to execute the other device-dependent commands. Generally, the “X” character is the last byte in the command string. Also, “X” triggers the instrument in T4 and T5.

NOTE

Command strings sent without an “X” character will not be executed at that time. They will be stored in the command buffer. The next time an “X” character is received. the stored commands are executed assuming all commands in the previous string were valid.

Programming Example-From the front panel, make polarity positive. Then, enter the following example into the HP-85 computer:

K:EFlOTE 71’5

c,,JTP,JT 7)5,; i i plji:! 1

Table 4-4. Range Commands

Range

Command

Rl R2

R3 R4 R5 R6 R7

Ron Dry Circuit Test

Descrip

200m

200

20 k

200 k 20

Autc

tio

”

Dry Circuit Test

Auto

200m

20 20 20 20

4.3.3 Operate/Standby (0)

With the use of the 0 command, the Model 580 can be

put in either operate (ready to take readings) or standby

by the controlier.

00 = Standby

01 = operate

Polarity is now negative, which indicates that the instrument received the command.

Upon power up, or after a DCL or SDC command, the status of the 0 command reflects the front panel button

selection.

4.3.2 Range (R)

Ranges are programmable over the bus. The range com- mands can be found in Table 4-4. Upon power up, or after receiving a DCL or SDC, the range of the Model 580 corresponds to the range pushbutton selected.

Programming Example-Cycle power on the Model 580

and manually select the 2Q range. Enter the following statements into the HP-85:

Programming Example-Model 580 is put into standby with the following HP-85 statement sequence:

F:EPll:lTE 725

,z 11-1 TF’,JT 725,; i i ,:,l;~:;! ?

The instrument is now in standby.

4.3.4 Dry Circuit Test (C)

,I il., TP,-,T 725; 6 6 F:~:z:> ?

The status of the Dry Circuit Test function of the Model

580 on power up refl&s the front panel button selection. When the END LINE is pressed the second time, the in- If Dry Circuit Test is chosen with a range higher than 200, strument switches to the R3 ranee (20R). “En” will atwear on the instrument disulav. and the ohms

and DRY &RCUIT TEST annunciators &I flash,

4-6

OPERATION

CO = Non Dry Circuit Test Cl = Dry Circuit Test

Programming Example-Model 580 is put into Dry Cir-

cuit Test with the following HP-85 statement sequence:

The instrument is now ready to take dry circuit test

measurements; the DRY CIRCUIT TEST annunciator appears on the Model 580 display.

4.3.5 Relative (2)

REL serves as a means for a baseline suppression. When the correct REL command is sent over the bus, the instrument will enter REL, as shown by the REL annunciator. All readings displayed or sent over the bus while REL is enabled are the differences between the stored baseline

and the actual resistance level. For example, if a 1OOmQ

baseline is stored, 1OOmQ will be subtracted from all subsequent readings as long as REL is enabled. The value of the stored baseline can be as little as a few micro-ohms or as large as the selected range will permit. REL is controlled by sending one of the following commands over the bus.

4.3.6 Digital Calibration (V) and Storage (L)

Calibration over the IEEE-488 bus can only be accomp-

lished with the calibration switch in the ENABLED posi-

tion. Refer to the Model 580 Service Manual for complete information.

Through the use of the V command, the Model 580 enters calibration and the calibration value is transmitted to the instrument. The calibration command is in the form:

V+n.nnnnE+nn

where: +n.nnnn represents the mantissa (4% digits)

E+nn represents the exponent

Through the use of the LO command the calibration values

entered are stored in NVRAM, then the Model 580 is returned to normal operation.

NOTES:

1. Only as many significant digits as necessary need to be entered. For example, for calibration of the 203 range with a 19.0000 input value, the following command would be used:

ZO = REL Disabled Zl = REL Enabled

Upon power-up, or after DCL or SDC, ZO is selected.

Programming Example-With the front panel REL button,

disable REL and enter the following statements into the HP-85 keyboard:

After the END LINE key is pressed the second time, the REL annunciator will turn on.

NOTE

See the Model 580 Instruction Manual for detailed information on the use of REL.

2. The correct calibration value must be connected to the instrument before the V command is sent.

Programming Example-

CAUTION

If the calibration switch is in the ENABLED posi-

tion (refer to the maintenance section of the

Model 580 Service Manual), DO NOT PERFORM THESE STEPS UNLESS A CHANGE IN CALI-

BRATION IS DESIRED. Unless proper calibration parameters have been previously programmed, inadvertently using this command

seriously affects instrument accuracy.

Using front panel controls, place the instrument in the 2P range. Connect a precise 1.9Q calibration resistor to the Model 580 test leads and enter the foliow,ing statements into the HP-85 computer:

4-7

OPERATION

When the END LINE key is pressed after the Vl.9X statement, the instrument calibrates itself in accordance with the applied signal.

When the END LINE key is pressed after the LOX statement, permanent storage takes place.

4.3.7 Polarity (P)

The Model 580 provides a selectable positive or negative

SOURCE current. The red SOURCE terminal is positive for PO and negative for l’l.

PO=Positive

l’l=Negative

Upon power up, or after a DCL or SDC command, the

PO (positive) is enabled.

After END LINE is pressed the second time, the instru-

ment will be placed in DC ( -=).

4.3.9 Triggering (T)

Triggering provides a stimulus to begin a reading conver-

sion within the instrument. Triggering may be done in two ways: in continuous, a single trigger command is used to start a continuous series of readings; in one-shot, a

separate trigger stimulus is required to start each conver-

sion. The Model 580 has six trigger commands as follows:

To Continuous On Talk Tl One-Shot On Talk T2 Continuous On GET T3 One-Shot On GET T4 Continuous On X

T5 One-Shot On X

Upon power-up or after a DCL or SDC command, To is

enabled. In ‘ItI and Tl, triggering is done by addressing

the Model 580 to talk. In TZ and T3, a GET command provides the trigger stimulus. In T4 and T5, the execute (X) character triggers the instrument.

Programming Example-Enter the following commands into the HP-85 follows:

The SOURCE current is now negative.

4.3.8 Drive (D)

The DRIVE feature of the Model 580 allows the user to

measure an unknown with a DC or pulsed source.

DO = Pulsed drive

Dl = DC drive

Upon power up, or after the instrument receives a DCL or SDC command, the DO or pulsed source is enabled.

Programming Example-DRIVE can be entered or changed with the following HP-85 statement sequence:

FEp,l:lTE -‘?y

,L,,jTP,JT 725,; i i 1,ii.g ?

I..

Programming Example--Place the instrument in one-shot talk with the following HP-85 statement sequence:

After the END LINE key is pressed the second time, the instrument will be in one-shot on talk. The instrument is

waiting for a trigger.

Trigger the instrument with a talk command by entering

the following statement into the HP-85

After pressing END LINE one reading will be processed.

To continue taking readings, one talk command must be

sent for each conversion.

4.3.10 EOI (K)

The EOI line on the bus is usually set low by a device during the last byte of its data transfer sequence. The Last byte

4-8

OPERATION

is properly identified, which allows variable length data words to be transmitted. The Model 580 normally sends EOI during the last byte of its data string or status word. The EOI response of the instrument may be sent with one of the following commands:

KO = Send EOI during last byte. Kl = Send no EOI.

KO is assumed at power up,

Programming Example-Model 580 EOI response is sup

pressed with the following HP-85 statement sequence:

Note that the HP85 does not normally rely on EOI to mark the last byte of data transfer. Some controllers, however, may require that EOI be present at the end of the transmitted string.

4.3.11 SRQ (M) and Status Byte Format

The SRQ command code controls the number of conditions within the Model 580 which cause the instrument to request service from the controller with the SRQ com-

mand. Once the SRQ is generated, the Model 580 status byte can be checked to determine if it was the Model 580 that requested service. Other bits in the status cycle could

also be set depending on certain data or error conditions.

The Model 580 can be programmed to generate an SRQ

under one or more of the following conditions:

1. If a reading has been completed.

2. If an overflow condition occurs.

3. If a busy condition occurs.

4. If an Illegal Device-Dependent Command Option

(IDDCO) is received.

5. If an Illegal Device-Dependent Command (IDDC) is

received.

6. If the instrument is not in remote when a command is

received.

Upon power up or after a DCL or SDC command, SRQ

is disabled.

SRQ Mask-In order to facilitate SRQ programming, the Model 580 uses an internal mask to generate an SRQ. When a uarticular mask bit is set, the Model 580 sends

an SRQ Ghen those conditions occur. Bits within the mask can be controlled by sending the ASCII letter “M” followed by a decimal number to set the appropriate bits. Table 4-5 lists the commands to set the various mask bits, while

Figure 4-l shows the general mask format.

Table 4-5. SRQ Mask Commands

Command Status Bits Enabled Conditions to Generate SRQ

MO - Clear SRQ Data Mask Ml Readine Oveflow MB ii Reading Done M9 83, 80 Ml6 84

Ml7 84, BO M24 84, 83 M25 84, 83, 80 M32 85 M33 85, BO

iti: 85, 85, 81 Bl, BO M36 85, B2 M37

B5, 82, BO

M38 85, B2, 81

M39 85, B2, Bl, 80

Reading Done or Reading Overflow Busy Busy or Reading Overflow Busv or Reading Done Busv. Rq sadine Done or Reading Overflow Cle& SRQ EGor Mask IDDCO IDDC IDDC or IDDCO Not in Remote Not in Remote or IDDCO Not in Remote or IDDC Not in Remote, IDDC or IDDCO

”

4-9

Programming Example-Cycle power on the Model 580

and program it for SRQ on IDDCO and output the status word.

PROGRAM COMMENTS

Table 4-6. Status Byte and Mask Interpretation

Bit 5 = 0 Bit 5 = 1

Bit (Data Conditions) (Error Conditions)

0 (LSB)

1 2 3 Reading done

4 5 Data

6 7

Busy

SRQ SRQ

N/A

ErPX

NJA

the computer. Display on CRT.

After entering the program, press the HP-85 RUN key. The UO status word wiIl then be displayed. The Me bytes (refer to Figure 4-2) contain “01” indicating that the Model 580

is prwrammed to SRO on an IDDCO.

. ”

Status Byte Format-The status byte contains information

relating to data and error conditions within the instrument. When a particular bit is set, certain conditions are present. Table 4-6 lists the meanings of the various bits and Figure 4-l shows the general format of the status byte, which is obtained by using the SPE, SPD polling sequence described in

paragraph 4.2.6.

o- ’

DATA BUSY DONE OVERFLOW

MSB 87 86 ES 84 93 B2 Bl

I- I- NOT

SRD ERROR

If the status byte is read when no SRQ was generated by

the Model 580 (bit 6 is clear). the current status of the in-

strument will be read. For example, if a reading was done, bit 3 would be set.

When an SRQ is generated by the Model 580, bit 6 of the status byte will be set. If an SRQ was caused by an error condition, bit 5 will also be set along with one of the error conditions (BO, Bl or 82). Only the-error that caused the initial SRQ will be defined by the status byte.

DATA CONDITIONS E-0

READING

BO LSB

IDDC IDDCO

REETE

ERROR CONDITIONS 85-l

4-10

Figure 4-1. Status Byte Format

O=STANDBY I=OPERATE

DRY CIRCUIT TEST

O=NON DRY CIRCUIT TEST

I= DRY ClRCVlT TEST

O=POSITI”E l=NEGATI”E

OPERATION

RANGE

n- nl,Tn

I- LVY,,II, 2= 2n 3=

4= 200 5= 2 k” 6= 20 IdI 7= 20Dk”

R R

RELATIVE- 1 1 1 1 I O=REL OFF I=REL ON

EOI

O=EOI ENABLED 1=EDI DISA6LE I = 5a-k

TRIGGER-

O=CONTINUOUS ON TALK l=ONE-SHOT ON TALK 2=CONTINUOUS ON GET S=ONE-SHOT ON GET 4=CONTINUOUS ON “X” 6=ONE-SHOT ON “X”

SRO DATA MASK m O,=READING OVERFLOW 08=READING DONE OS=READING DONE OR READING OVERFLOW

16=BUSY

17=B”SY OR READING OVERFLOW 24=WSY OR READING DONE 26=B”SY. READING DONE OR READING OVERFLOW

'II I

-SRQ ERROR MASK

TERMINATOR ASCII CHARACTER

iCRllLFl iLFllCR1

ND TERMINATOR

0=60Hz

Ol=IDDCO

02=IDDC Ol=lnn,-Cl OR ,,,,JC

-_ .II-” O4=NOT IN 06=NOT IN 06=NOT IN REMOTE OR IDDC 07=NOT IN REMOTE, IDDCO OR IDDC

REMOTE REMOTE OR IODCO

Figure 4-2. General Format for UO Command

4-H

OPERATION

If the SRQ was caused by a data condition, bit 5 will be clear and the appropriate data condition bits (BO, B3 and B4) will be set. If a busy condition caused the SRQ then only the busy bit will be set.

After an SRQ, the status byte will remain unchanged until it is read. The various bits in the status byte are described below:

Reading Overflow-Set when an overrange input is applied to the instrument.

Reading Done-Set when the instrument has completed the present conversion.

Busy-The instrument is still executing a prior command and is not ready to accept a new command.

IDDCO-An illegal command option such as R9 has been received from the controller. This bit is cleared when the status byte is read.

IDDC-An illegal command, such as Nl, has been received from the controller. The IDDC bit is cleared on a reading of the status byte.

Not in Remote-The Model 580 is in local when a DDC is received.

PROGRAM COMMENTS

Set up for remote operation. Program for SRQ on IDDCO. Attempt to program illegal command option. Perform serial poll.

Loop eight times

NOTE

To align the display properly, type in the program exactly as shown. In line 100 the space between

the first quotation marks and the fist pointer is four spaces. Then to the next pointer is two spaces, and 14 spaces to the last pointer in the line. In line 110 the space between the first quotation marks and SRQ is two spaces. Then to ERROR allow two spaces and then 10 spaces to IDDCO.

NOTES:

1. Once the Model 580 has generated an SRQ, its status byte must be read to clear the SRQ line. Otherwise the instrument continuously asserts SRQ.

2. The Model 580 may be programmed to generate an SRQ for more than one condition simultaneously.

Programming Example-Enter the following program into the HP-85 computer.

To run the program press the HP-85 RUN key. The computer conducts a serial poll and displays the status bits in order on the CRT. The SRQ (B6), error (B5) and IDDCO (Bl) are set because line 30 of the program attempted to program the instrument with an illegal command option

(R9).

After the program has been entered, press the HP-85 RUN key. Note the CRT, it will be as follows:

412

OPERATION

B7 B6 85 B4 B3 B2 Bl BO

0 1100010

w.6 ZRROR

Bit 6 (86) is set, meaning a SRQ condition exists. Bit 5 (85)

is also set, meaning there is an error condition. Bit 1 is set, meaning an Illegal Device-Dependent Command Option (IDDCO) condition exists.

IDDCO

4.3.12 Status Word (U) or Alternate Output

The status word commands allow access to information concerning present operating modes of the instrument. When the status word command is given, the Model 580 transmits status information instead of its normal data string the next time it is addressed to talk. The Model 580 status word command is:

UO = Send instrument status on operating modes.

Figure 4-2 shows the general format for the UO command. The letters in the UO format correspond to other device-

dependent commands.

PROGRAM

After entering the program, press the HP-85 RUN key. The UO status word is then displayed on the CRT. Refer to

Figure 4-l.

COMMENTS

Set up instrument for

remote operation.

Send UO status

command.

Enter status word into computer.

4.3.13 Prefix (G)

With the use of the G command, the prefi for the status

word or data string can be either transmitted or deleted.

The commands are as follows:

GO = Include prefix Gl = Suppress prefix

NOTES:

1. Status word information is returned only once each time the command is sent.

2.The returned terminator character (Y) is derived by ANDing the 00001111 and ORing the result with

00110000. For example, the last byte in the normal (CR

LF) terminator sequence is an LF or ASCII 10 (oooO1010). ANDing with 00001111 yields 00111010 which is printed out as an ASCII colon (:).

3. The status word should not be confused with the status byte. The status word contains a number of bytes pertaining to the various operating modes of the instrument. The status byte is a single byte that is read with the SPE, SPD command sequence and contains information on SRQ status and error and data conditions.

4. The returned SRQ mode (M) value is determined by adding up the value of the bit positions in the status byte that could cause an SRQ according to the previous programmed value of the SRQ mode. Refer to paragraph

4.3.11 for complete information on the SRQ mask and status byte.

5. Line frequency (H) is 0 for 60Hz and 1 for 50Hz.

Programming Example-Enter the following program in-

to the HP-85. Be sure to include line numbers.

Upon power up or after a DCL or SDC command, the GO

mode is enabled.

Programming Example-Program the Model 580 to out-

put a data string without the prefix.

PROGRAM COMMENTS

163 F:EP,BTE 7’25

.:Ei ~IlJTPlJT 725; c 6 ,;li.::’ 3 Suppress p*&. 30 EHTER 7.25,; HS

40 IlI:;p I?($

50 E,.,I,

To run the program, press the HP-85 RUN key. The data string appears on the CRT without the prefix (N+NP). Refer to Figure 4-3, which shows the data string format with the prefix.

Set up for remote

operation.

Enter command into the computer. Display data string on CRT.

413

Programming Example-The terminator can be eliminated by sending an ASCII DEL with the following HP-85

statements:

N=NORMAL

O=OVERFLOW Z=ZERO

EXPONENT

P=P”LSED

D=DRY CIRCUIT TEST

Figure 4-3. Data Format

4.3.14 Programmable Terminator (Y)

The Model 580 uses special terminator characters to mark the end of its data string or status word. To allow a wide variety of controllers to be used, the terminator can be changed by sending the appropriate command over the bus. The default value is the commonly used carriage return, line feed (CR LF) sequence. The terminator sequence assumes this default value upon power up or after the instrument receives a DCL or SDC.

The terminator may be programmed by sending the ASCII character Y followed by the desired terminator character. Any ASCII character except the following may be used:

When the END LINE key is pressed the second time, the terminator is suppressed; no terminator is sent by the instrument when data is requested. The absence of the normal terminator may be verified by entering the following statement into the HP-85 computer:

At this point the HP-85 ceases to operate because it is waiting for the standard CR LF terminator sequence to terminate the ENTER statement. The computer may be reset by holding down the SHIFT key and pressing the RESET key on the keyboard. To return the instrument to the normal terminal sequence, enter the following statement into the HP-85 computer:

4.3.15 Data Format

Model 580 data is transmitted over the IEEE-488 bus as a string of ASCII characters with the format shown in Figure

4-3.

1. Any capital letter.

2. Any number.

3. Blank

4. + - i ore

Special command characters will program the instrument for special terminator sequence as follows:

1. Y(LF) = CR LF (Two terminators)

2. Y(CR) = LF CR (Two terminators)

3. Y(DEL) = No terminator

NOTE

Most controllers use the CR or LF character to terminate their input sequence. Using a nonstandard terminator may cause the controller to hang up unless special programming is used.

4-14

The first four characters indicate the function status of the Model 580. The first character shows if the unit is in standby (S), normal (N), overflow (0) or zero (2); the second

character indicates positive polarity (+) or negative polarity

(-); the third character indicates if the unit is in Dry Circuit Test (D) or in non-Dry Circuit Test (N); and the fourth

character indicates pulsed drive (I’) or DC drive (D).

The mantissa of the reading is made up of eight characters,

including sign and decimal point, while the exponent requires three characters. To obtain the data string from the

instrument, the controller must perform the following sequence:

1. Set the ATN true (low).

2. Address the instrument to talk.

3. Set ATN false (high).

4. Input the data string one byte at a time.

OPERATION

NOTE The data string can be transmitted without the prefix 580.

programming Example-Cycle power on the Model 580 (turn it off, then on) and program it to output a data string.

PROGRAM

18 REllOTE 725

50 ENTER 725; A$ Enter data string into controller.

30 1,1:jp (48

40 EM

To run the program press the HP-85 RUN key.

COMMENTS

Set up for remote operation.

Display data string on CRT.

4.4 TALK ONLY OPERATION

The talk only feature of the Model 58015802 may be used to send data to a listen only device such as printer. When the Model 580 is in talk only, it ignores commands given over the IEEE-488 bus. Talk only is enabled by placing the TWADDRESSABLE switch of the primary address switch in the ‘I0 position (refer to Figure 3-7) and cycling power to the instrument. The talk rate is typically three readings per second, depending on the function. However, a different talk rate can be selected using an external trigger source by performing the following procedure:

1. Enable the listen only capability of the receiving device (such as a printer).

2. Connect the Model 580/5802 to the listen only device with an appropriate IEEE-488 cable.

3. Place the LSB (least significant bit) switch on the Model 5802 at 0 to send a prefix with the reading, or at 1 to send data only (suppress the prefix).

4. Power up Model 580 (again, default reading rate is three readings per second).

5. Press SHIFT, then SINGLE to put the instrument in oneshot. Now, every time SINGLE is pressed or an external trigger is received, a reading will be taken (up to the maximum reading rate of that function).

When the Model 580 is used in talk only, it may be interfaced with one or more listeners. Each of these devices and associated cables should conform to IEEE-488-1978

standards.

The Model 580 transmits its normal data string in bit

parallel byte serial fashion over the bus as requested by the listeners. The data format used is the same one used

for addressable operation and is described in detail in

paragraph 4.325. If the address switches are set to an odd number the prefii is sent with the reading. An even address number sends only the data.

4-15/4-16

5.1 INTRODUCTION

SECTION 5

ANALOG OUTPUT

The analog output is an important feature of the Model 5802 IEEE-488 Interface. It is useful for monitoring the input signal with an exkrnal device such as a chart recorder. The analog signal is reconstructed from digital data (supplied by the internal microprocessor) by a 13 bit D/A converter. Because of this condition the analog output accurately reflects the display until an overflow condition is reached. The analog output is optically isolated from the Model 580 to avoid potential ground loop pmblems. There are two levels of gain for the analog output, the Xl gain and the Xl00 gain. Refer to paragraph 5.4.

On the Xl gain, 1V at the analog output corresponds to 10,000 counts on the Model 580 display. On the Xl00 gain, 1V at the analog output corresponds to 100 counts on the Model 580 display.

The accuracy of the analog output is *0.25% of displayed reading +2mV, where 2mV in Xl00 = 0.2 displayed counts. Update of analog output is coincident with update of the

display.

5.2 USING THE ANALOG OUTPUT

The analog output is useful for monitoring the input signal with an external device such as a chart recorder. Using the analog output connected to chart recorder produces a hardcopy of the input signal over a period of time.

r I

I? lo

mmu?

REAR PANEL

Figure 5-1. Analog Output Connections

CAUTION

The potential between the analog output LO ter-

minal and earth ground must not exceed 30V RMS at DC, 50 or 60Hz peak. Make sure the ex-

ternal device does not exceed this voltage on

its common or ground connections. Failure to

observe this precaution may damage the Model

58015802. IEEE-488 common is connected to analog output common.

WARNING The potential between the SOURCE LO of the Model 580 and the analog output LO of the Model 5802 must not exceed 30V RMS et DC, 50 or 60Hz. Failure to observe this precaution may result in a dangerous potential being present on the analog output terminals and the IEEE-488 connector. This situation could result in personal injury or death.

1. Connect the measuring device to the two analog output terminals on the rear panel as shown in Figure 5-l.

5-l

ANALOG OUTPUT

2. Select the desired gain. The gain switch is located on the rear panel. A logic one (up position) is the Xl00 gain.

A logic zero (down position) is the Xl gain.

Xl gain--Set switch to logic 0. Xl00 gain-Set switch to logic 1

In the Xl position, the most significant k2000 counts of the displayed reading can be covered. The span on this range (Xl) is t2V in 1mV steps. In the Xl00 position, the least significant 400 counts of the displayed reading can be covered. The span on this range is t4V in 1mV steps.

3. If necessary, the analog output may be zeroed with the

REL function. To do so, press the REL button on the front panel. All subsequent readings are referenced to the previously displayed value. Refer to the Model 580 Operator’s Manual for complete details concerning the REL function.

The Model 580 displays an “OL” message when the

capability of a specific range is exceeded. When this message is displayed and the Xl gain is selected, the analog output value is +2V if the polarity of the displayed value is positive and -2V if the display value is negative. The analog output value is +4V respectively if the Xl00 gain is selected.

An analog output range overflow can occur when the Model 580 analog range switch is in the Xl position. An example of the analog output voltage under these conditions is shown in Figure 5-2. The conditions shown are for the Model 580 in the 2COmR range, but the output reacts similarly on the other resistance ranges if the proper scaling is applied. For each tenfold increase in range, the scale of the horizontal axis must also be multiplied by a factor of ten.

The horizontal axis of Figure 5-2 has a range of -199.99mR

to +199.99mR.

The analog output follows the display value linearly until

the input resistance reaches 19999 counts (either positive or negative). The analog output then outputs the range overflow voltage of +2V depending on the polarity of the display value.

A summary of analog output information is shown in Table 5-l. Each range of input values corresponds to the increment necessary to cause the analog output to go through its entire 0 to i2V range.

5-2

---2”

‘-OL’ DISPLAYED

Figure 5-2. Xl Analog Output

-3v t

ANkOS

OUTPUT

ANALOG OUTPUT

Table 5-1. Analog Output Parameters

Range

Input for 1.99v Analog Output

Input for 4.oov Analog Output

2OOmR

2 0

20 0

200 0

2 kR

20 kn

200 kR

199mR

1.99n

19.9R 19961

1.99kR

19.9kQ 199kR

Xl00

4.00mn

40.0mQ 400mR

4.00R 4o.ofl

4000

4.OOkR

5.3 OUTPUT RESISTANCE

The output resistance of the analog output is lkSL This

is true for all ranges regardless of the gain status. Thus, loading problems caused by external devices are minimized. In order to keep loading errors below l%, the in-

put resistance of any device connected to the analog out-

put should be greater than 100kO.

5.4 Xl00 RESOLUTION AND ACCURACY

In Xl00 the analog output increases the resolution of the Model 580 beyond the 4% digits of the display. This provides an output step size of 2mV per each 0.2 counts of the displayed reading. For example, on the 200mR range, a 2mV step in the analog output voltage corresponds to a 2~12 change in applied resistance to the Model 580. The extra resolution allows for a more continuous output.

ANALOG

OUTPUT

Figure 5-3. Xl00 Analog Output

5-315-4

SECTION 6

PRINCIPLES OF OPERATION

6.1 INTRODUCTION

This section contains a circuit description of the Model 5802 interface. The IEEE-488 interface option enables the Model 580 to be incorporated into a measurement system that utilizes programmed control through the IEEE-488 bus.

6.2 CIRCUIT DESCRIPTION

The entire IEEE-488 interface circuitry is located on a single board. The schematic number for the Model 5802 is 5802-106. Figure 6-l shows a simplified block diagram of the interface. The following descriptions cover the power supply, digital circuitry and analog output circuitry.

ODEL

980

OPT0 PROCESSOR GUS

ISOLATION CONTROLLER

UlO7 Ulli! Ul15

Ull3

6.2.1 Power Supply

The positive supply (V+) provides power to the +5V regulator VR104, LJ109 and U110. The supply voltage to

U109, UllO and VR104 must be a minimum of +7.OV for V+ and -6.2V for V- to allow ample supply head room in order for the outputs to swing to their specified voltages. The negative supply V- is generated using Cll2, CR102, CR103 and Cl08 configured as a voltage inverter. During the positive going cycle of the line, CR102 is forward biased allowing Cl12 to charge to the peak voltage of the AC IN. CR103 is reversed biased. On the negative going line cycle CR102 is reversed biased and CR103 is forward biased allowing the charge on Cl12 to be transferred onto C108. Thus Cl08 is charged to -VP (negative peak voltage).

DATA BUS

TRANSCEIVER

Ull4

ANALOG OUTPUT

UIOI AND U109

Figure 6-1. Simplified Block Diagram

ii-l

PRINCIPLES OF OPERATION

6.2.2 Digital Circuitry

The digital circuitry consists of the microprocessor (UlOZ), EPROM (U104), decoder (Ulll), IEEE-488 controller (Ull2) and bus transceivers (U114 and Ull5). Reset for the interface is accomplished by the internal reset feature of the microprocessor (U102) and its Ii0 line (PBl). Upon power up the microprocessor executes an internal reset routine. This cycle lasts 1920 clock cycles (one cycle = 8OOkHz = 125~sec). After configuring itself, the processor sets PBl low then high. This resets the IEEE-468 controller (Ull2). Figure 6-2 shows the memory map for the interface,

SIFFF

SlFF6 SIFF5’

Slwo SCFFF

INTERRUPT

VECTOR JAM

READ ONLY

MEnORY

NOT USED

NOTE

The primary address is updated only upon power “P.

The address switch is read through Port A (PA2-PA6) of u102.

6.2.3 Analog Output

The analog output of the Model 5802 is derived from the displayed reading of the Model 580. This reading is sent over the opto interface to the Model 5802. The digital reading is then transformed to an analog output by a l3 bit DAC (digital-to-analog converter) on the Model 5802.

The DAC is composed of a 12 bit serial input monolithic

CMOS multiplying DAC and a *4V polarity switchable

reference. The output of the DAC is given by:

12 bit word

v.., =--VW

4096

m6oo SO?FF

:i?iz

so080 IcmF

mooo

IEEE-M

BUS

NOT USED

I/O PORTS

TIMER Uloz

RMl

Figure 6-2. Memory Map

The interface is capable of performing all IEEE-488 talker/listener protocols. The bidirectional data lines DO through D7 permit the transfer of data between the microprocessor and the bus. The transceivers are used to drive the output and also buffer the data.

The primary address switches (SWlOl) select the primary address and permit 31 primary talker/listener address pairs. To address the Model 580, the controller must lend the primary address of the Model 580. The factory set address is 25 (11001). The microprocessor reads the primary address from SWIOl and then knows which talker/listener address to assign the IEEE-466 controller and thus the Model 580.

Data is sent to the serial input DAC over three control lines (Data, Clock and Strobe). The DATA is clocked into the DAC on the rising edge of the clock. Once all 12 bits have been sent, pulling the strobe line low forces the output of the 12 bit DAC to a level corresponding to the new DAC input. The polarity of the 4V reference is controlled by the processor through UlOl, QlOl and 4102. For a positive reference voltage, the sign bit is low, allowing +5V to be switched to the gate of QlOl grounding the anode of VRlOl. For a negative reference, the sign bit is high, gate voltage to Q102 is high and the cathode of VRlOl is pulled to the ground. U109 acts as a X3.2 buffer to boost the reference voltage from 21.25V to +-4V.

The analog output allows selectable gains, Xl or X100. In Xl, the most significant rt2000 counts of the display are used for determining the output. In X100, the least significant i400 counts of the display (and an internal digit) are used for determining the output. See Figure 6-3. The extra resolution allows a continuous analog output.

6-2

PRINCIPLES OF OPERATION

Opto-isolators U109 and Ulll electricaJIy isolate the Model 580 from the Model 5802 interface. This isolation allows the Model 580 to maintain its 30V common mode floating specification. The specification is maintained even if the interface is referenced to the IEEE-488 controller ground.

Xl x100

Figure 6-3. Xl and Xl00 Gains

‘,-he ou~p”’ ,.L .I... T,nc- ..-I :-A I--I __^- -

+1.999v ir

condition results in an output of i1.999V in Xl and

i3.999V in Xl00 respectively.

“L “1 L11C LItxL “‘llle5 “elwecll --I.777v all”

I Xl and -3.999 and +3.999 in X100. An overload

1 nnm, --_I

6-316-4

SECTION 7

MAINTENANCE

7.1 INTRODUCTION

This section contains information necessary to maintain the Model 5802 IEEE-488 Interface. Installation procedures, troubleshooting information and instructions concerning care in handling static sensitive devices are included.

WARNING All service informarion is intended for qualified electronic maintenance personnel only.

7.2 INSTALLATION

The Model 5802 is field installable. To install the interface into the Model 580 use the following procedure and refer

to Figure 7-1.

WARNING To prevent shock hazard, turn off the Model 680, remove all test leads from the instrument and

unplug the line cord.

1. Remove and retain the top cover. The top cover is secured by four screws that are accessible from the bottom of the instrument.

2. Install the rear standoff (STZl-1) by positioning it over the hole on PC board as shown in Figure 7-1, and pressing firmly until it snaps securely into the board.

3. Position the interface board loosely on the rear standoff.

WARNING

If the interface is removed, use the original top cover supplied with the Model 560 (if available). If the modified top cover is used, cover the

holes normally occupied by the IEEE-466 con-

nector and switch. Failure to cover these holes could result in a shock hazard that could cause severe injury or death.

At this point, it is necessary to recalibrate the Model 580 to maintain rated accuracy specifications. If the instrument is not recalibrated at this time, add +O.Ol% to the Model 580 accuracy specifications (these can be found on the first page of the Model 580 Operator’s and Service Manual). Refer to the Model 580 Service Manual for calibration procedures if the 58015802 is to be recalibrated.

7.3 5602 CALIBRATION

Calibration of the Model 5802 should be performed every X2 months. If any of the calibration procedures in this section cannot be performed properly, refer to the troubleshooting information in this section. If the problem persists, contact your Keithley representative or the factory for further information.

7.3.1 Warm Up

The Model 580, with the Model 5802 installed, requires

one hour for warm up to achieve rated specifications. The top cover must be installed.

WARNING

Do not push down on the white I tor (JIOOE). The male connector pins will pass through 51006 and may cause personal Injury.

4. Guide the terminals of I’IOOB into JlUOS and firmly push down on that end of the board to mate the connectors.

5. Push down on the other side of the interface board until it snaps onto the rear standoff. Make sure the board is seated properly on the front standoffs.

6. Install the modified top cover.

7.3.2 Recommended Calibration Equipment

Calibration of the Model 5802 may be done with the equipment listed below. Alternate equipment may be used but the specifications must be at least as accurate as the specifications that follow:

4% digit DMM --with *(0.03% + 1 count) accuracy on ZV range with greater than lOM61 input resistance (Keithley Model 175)

Resistance Calibrator: Fluke Model 5450A

MAINTENANCE

TOP COVER

( NOT SHOWN )

1753-304

HEAT SINK

HS-28

CONNECTOR

CS-332-7

IEEE CONNECTOR CS-377

CONNECTOR HARDWARE CS-378

TO/ADDRESS SWITCHES

W-449-7

ANALOG OUTPUT JACKS

( 2 REOUIRED)

29316

7-2

Figure 7-1. Model 5802 installation

7.3.3 Environmental Conditions

Calibration should take place in laboratory conditions having an ambient temperature of 23OC f3’C and a relative humidity of less than 70%. If the instrument has been subjected to temperatures outside of this range or to higher humidity allow at least one additional hour for the instrw ment to stabilize before beginning calibration procedure.

7.3.4 Calibration

Perform the following steps to calibrate the Model 5802.

1. Devices should be handled and transported in protective containers, antistatic tubes or conductive foam.

2. Use a properly grounded work bench and a grounding wrist strap.

3. Handle the devices only by the body. Do not touch the

pins.

4. The PC boards must be grounded to the bench while

inserting devices.

5. Use antistatic solder suckers.

6. Use grounded tip soldering.

7. After devices are soldered or inserted into sockets, they

are protected and normal handling may resume.

1. Turn on the instrument and allow one hour for warm UP.

2. Select the 2kO range. Set the Model 5802 for the Xl gain.

3. Apply 1.9kQ to the Model 580 input.

4. Measure the analog output voltage with the 4% digit DMM.

5. Adjust Rll2 until the analog output reads 1.9000 *0.0004v.

6. Model 5802 calibration is now complete.

7.4 SPECIAL HANDLING OF STATIC

SENSITIVE DEVICES

MOS and CMOS devices are designed to function at very high impedance levels. Normal static charge can destroy these devices. Table 7-l lists all the static sensitive devices for the Model 5802. Steps 1 through 7 provide instruction on how to avoid damaging these devices.

Table 7-1. Static Senstive Devices

7.5 TROUBLESHOOTING

The troubleshooting information in this section is intended for use by qualified personnel who have a basic understanding of the analog and digital circuitry used in an IEEE-488 interface. Instructions have been written to assist in isolating the defective circuit. Isolating the defective component has been left to the technician. Refer to Table 7-2 for IEEE-488 interface board checks.

NOTE

For instruments that are still under warranty (less

than 12 months since date of shipment), if performance falls outside specification at any point, contact your Keithley representative or the factory

before attempting troubleshooting or repair.

Circuit Designation

UlOl u102 u103 u104

U105, U106

U108

Ulll

Keithley Part No.

IC-283 LSI-60 IC-341 5802-800 IC-106 IC-419 IC-338

7-3

Table 7-2. Model 5802 Interface Checks

NOTE

All voltages are referenced to ANALOG OUTPUT common except steps 1 and 2 which are referenced to instrument digital common.

Step Item/Component

1 JlOOS Pin 1 referenced to +5v *lO%

Pin 2

2 U106 Pins 2, 4, 6 and 10 OV to 5V data pulses. 3 vR104oLrr +5v *lO% 4 VRlO4 IN 5 CR103 Anode 6 SlOl (l-7)

7 U102 Pin 4 8 U102 Pin 6

9 U102 Pin 2 +5v Level IRQ Line 10 Ull2 Pin 19 11 Program the Model 580 into

the Remote Mode (primary

address 25) 12 U114 Pins 19 and 2 I3 U114 Pins 18 and 3

14 U114 Pins 4 and 17 Handshaking sequence, refer to paragraph NRFD Line

15 U114 Pins 16 and 5

16 U114 Pins 15 and 6

17 U114 Pins 14 and 7

18 U114 Pins I3 and 8

19 U114 Pins l2 and 9

20 U105 Pins 4, 6, 10, I.2 and 15 OV to 5V data pulses.

21 UXl2 Pin 34 c5V pulses Strobe Line (analog out) 22 U102 Pin 33 +5v Pulses Data Line (analog out)

23 U102 Pin 36 +5V Pulses Clock Line (analog out) 24 U102 Pin 35 +5V pulsed low during power up. RESET Line 25 U109 Pin 6 *4v *0.002%

26 U109 Pin 3 k1.25V *2.5% -1.25V for positive

Required Condition

+8.5V +lO%

-8.5V *lO%

In the “1” position the switch is pulled up to Primary Address

c5v *lO% W to +5V pulses at =800kHz rate. DS (data strobe) OV to +5V pulses at I 800kHz rate. AS (address strobe)

+5v Level

ov to +0.5v REN Line (low true)

+5V +lO%, pulsed low when an IFC IFC Line command is sent.

2.3.2.

Handshaking sequence, refer to paragraph NDAC Line

2.3.2. Handshaking sequence, refer to paragraph DAV Line

2.3.2.

+5V *lo%, pulsed low at the end of multi-byte transfer sequence in the KO mode. OV to +.5V when processing multiline ATN Line commands. OV to +0.5V when SRQ condition exists. Refer to SRQ Line paragraph 4.3.8.

RMll~kS

+5V Instrument Digital

SUPPIY

+5V IEEE Digital Supply +v

-V

RESET Line

EOI

-4V for positive display; +4V for negative displa)

display; t1.25V for negative display

7-4

SECTION 8

REPLACEABLE PARTS

8.1 INTRODUCTION

This section contains replacement parts information, component location drawings and schematic diagrams for the Model 5802.

8.2 REPLACEABLE PARTS

Parts are listed alphanumerically in order of the schematic designation. Table 8-l contains parts list information for the Model 5802.

8.3 ORDERING INFORMATION

To place and order, or to obtain information concerning replacement parts, contact your Keithley representative or the factory. See the inside front cover for addresses. When ordering include the following information:

1. Instrument Model Number

2. Instrument Serial Number

3. Part Description

4. Circuit Description (if applicable)

5. Keithley Part Number

If an additional instruction manual is required, order the manual package (Keithley part number 5802-901-00). The manual package includes an instruction manual and all pertinent addenda.

8.4 FACTORY SERVICE

If the instrument is to be returned to the factory for service, carefully pack the unit and include the following:

1. Complete the service form which follows this section and return it with the instrument.

2. Advise as to the warranty status of the instrument (see inside front cover for warranty information).

3. Write the following on the shipping label: A’l%NTION

REPAIR DEPARTMENT

8.5 SCHEMATIC DIAGRAMS AND

COMPONENT LOCATION DRAWINGS

The component location drawing of the Model 5802 is shown in Figure 8-1. The schematic diagram of the Model 5802 is shown in Figure 8-2.

8-I

REPLACEABLEPARTS

Table 0-I. Model 5802 Parts List

Circuit Desig. Description

Cl01 Cl02 Cl03 Cl04 Cl05 Capacitor, O.lfi, 5OV, Ceramic CM6 Cl07 Cl08 Cl09 Cl10 Cl11 cm Cll3 Cl14

CR101 Bridge Rectifier, Silicon CR102 Rectifier CR103 Rectifier

J1014 JlLw8 JlOl2 JlOl3 Jack

Capacitor, 4.7hF, 25V, Aluminum Electrolytic Capacitor, 22pF, lOOV, Ceramic Disc Capacitor, 22pF, KU&‘, Ceramic Disc Capacitor, O&F, 5OV, Ceramic

Capacitor, lOOpF, XXIV, Ceramic Diic Capacitor, IoOpF, lOOV, Ceramic Disc Capacitor, 250aF, 25V, Aluminum Electrolytic Capacitor, O.l@, 5OV, Ceramic Film Capacitor, O.l& 5OV, Ceramic Capacitor, 22O$F, 16V, Aluminum Electrolytic

Capacitor, 250/1F, 25V, Aluminum Elecbolytic

Capacitor, l$, 5OV, Metalized Polyester

Capacitor, O.l& 5OV, Ceramic

IEEE-488 Connector 7-Pi Molex Connector Jack

Schematic Keithley

Location Part No.

84 c-314-4.7 83 c-22-22p 83 c-22-22p

C-365-.1

E c5 H3 C-237-.1 D5

E A2 c-350-1 A3 C-365-.1

c5 RF-52

c5 RF-38

c5 RF38

c5 CS-332-7

C-365-.1 c-22-lOOp c-22~loop C-314250

C-365-.1 c-351-2200 c-314250

cs-377

29316 29316

KlOl Relay

QlOl

4102

RlOl RlO2 R103 R104 R105

R106 RX?7 R108 R109 RllO Rlll RX? Rll3 R114 Thick Film Resistor Network

SlOl

UlOl Triple 2-Channel Analog Multiplexer, CD4053BC ulO2 CMOS 8 Bit Microprocessor, 146805E2 u103 u104*

u105 Hex Inverter, 4049

Transistor, N-Channel Enhancement MOSFET Transistor, N-Channel Enhancement MOSFET

Resistor, lOMO, 5%, %W, Composition Resistor, Mkll, 5%, ‘/rW, Composition Resistor, 3O.lkQ, l%, */,W, Metal Film Resistor, 19.6kQ, 156, ‘IsW, Metal Film Resistor, 29&R, O.l%, ‘/.W, Fixed Resistor, lOkR, 1%. ‘/.W, Metal Film Resistor, lOOkQ, 596, VrW, Composition

Resistor, 3300, 5%, %W, Composition Resistor, lOk0, 5%, VrW, Composition Resistor, lOOkn, 5%, ‘/rW, Composition Resistor, 33OQ 5%, ‘/rW, Composition Potentiometer, 5k Resistor, lk0, lo%, YzW, Composition

Bank of 7 Dip Switches (Primary Address)

Triple 3-Input NAND Gate, MM74HClO

4kx8ROM

E4 RL83

85 1972-600 A5 1972-600

c3 R-76-1OM D5 R-76-1Ok 85 R-88-3O.lk 84 R-88-19.6k A4 R-T76-29.4k A4 D5 R-76-1OOk D6 R-76-330

Es R-76-1Ok E5 R-76-1OLlk E5 R-76-330 A4 RF-89-5k

A2 R-l-lk

Bl TF-99

82 SW-449-7

E D2 IC-341

R-X’%lOk

IC-283 LSI-60

5802-800-‘” IC-106

*Order current software level (i.e., 5802-MUO-Al)

8-2

Table 8-l. Model 5802 Parts List (Cont.)

REPLACEABLE PARTS

Circuit Desig. Description

U106 Hex Inverter, 4049 u107

U108 u109 UllO Ulll UllZ Ull3 u114 Ull5 GPIB Transceiver, 75160

VRlOl VR102 Diode, Zener, 5.1V VRlO3 Diode, Zener, 5.1V VR104 +5V Regulator, LM340A

YIOl Crystal, 4.0MHz

Opt0 Coupler, TILll7 Serial Input lZ-Bit DAC, 7543KN Op Amp, 308A Op Amp, 308A Octal D Latch, 74HC373 GPIB Adapter, 9914 Opt0 Coupler, TILll7 GLIB Transceiver, 75161

Diode, Band Gap Reference, 1.25V

Schematic Keithley

Location Part No.

E5 K-106

IC-362 z B4

E3 IC-338

G2 IC-298

E DZ-59 D5

IC-419

IC-203 K-203

LSI-49 IC-362 IC-299

DZ-65 DZ-59

IC-93

CR-10

8-3

REPLACEABLE PARTS

8-4

Figure 8-l. Model 5802 Interface, Component Location Drawing, Dwg. No. 5802-100

REPLACEABLE PARTS

Figure 8-2. Model 5802 Interface, Schematic Diagram Drawing No. 5802-106

E-5/8-6

Service Form

Model No.

Serial No.

Date

Name and Telephone No. Company

List all control settings, describe problem and check boxes that apply to problem.

Cl Intermittent 0 IEEE failure

0 Front panel operational

Display or output (check one) 0 Drifts

0 Unstable 0 Overload

0 Calibration only 0 Data required

(attach any additional sheets as necessary)

Show a block diagram of your measurement system including all instruments connected (whether power is turned cm or not). Also, describe signal source.

0 Analog output follows display

0 Obvious problem on power-up 0 All ranges or functions are bad

0 Unable to zero 0 Will not read applied input

0 Certificate of calibration required

0 Particular range or function bad; specify

0 Batteries and fuses are OK 0 Checked all cables

Where is the measurement being performed? (factory, controlled laboratory, out-of-doors, etc.)

What power line voltage is used?

Relative humidity?

Any additional information. (If special modifications have been made by the u8er, please describe.)

Other7

Ambient temperature?

“F

Index

Addenda; l-1 Address Commands; 2-5, 2-7 Analog Output; Set 5, 6-2

Bus Commands; 2-3, 2-4, 2-5, 41,

4-2, 4-3 Bus Connections; 3-2 Bus Description; 2-l Bus Lines; 2-2, 2-3 Bus Management Lines; 2-2

Calibration;

Environment; 7-3

Equipment; 7-l

Warm Up; 7-l Circuit Description; 6-l Command Codes; 2-5

Commands;

Addressed; 2-5

Device-dependent; 2-5

Unaddressed; 2-5

Uniline; 2-4

Universal; 2-4

Command Sequence; 2-8 Component Location Drawing; 8-l Connector, IEEE; 3-2 Contact Assignments; 3-2

Data Format; 4-14 Data Lines; 2-3 Device Clear (DCL); 4-3 Device-dependent Command

Programming; 4-4 to 4-14

Device-dependent Sequence; 2-5,

2-8

Digital Calibration (V), Stol’age (L);

Digital Circuitry; 6-2 Drive (D); 4-8 Dry Circuit Test (C); 4-6

EOI (K); 48 Execute (X); 4-6

Factory Service; 8-l Format;

Data; 4-14 Status Byte; 4-10 UO Command; 4-11

Go To Local (GTL); 4-2

Handshake Sequence; 2-3 Hardware Considerations; 3-1, 3-2,

3-4

m-85; 3-5

IEEE Bus Lines; 2-2 Installation; 7-1 Interface;

Commands; 3-7 Function Codes; 3-6 Routines; 3-5

Interface Clear (IFC); 4-7

Local Lockout (LLO); 4-2

Memory Map; 6-2

Operate/Standby (0); 4-6 Ordering Information; 8-l

Polarity (P); 4-8 Power Supply; 6-l Prefix (G); 4-13 Primary Address; 3-4

Programmable Terminator (Y); 4-14

Range (R); 4-6 Rear Panel; 3-3 Relative (Z); 4-7

Remote Enable (REN); 4-l

Replaceable Parts; 8-l

Safety Symbols and Terms; 1-l Schematic Diagrams; 8-l Selective Device Clear (SDC); 4-3 Serial Polling (SPE, SPD); 4-3 Software Considerations; 3-5, 3-6,

3-7

Specifications; l-2

SRQ Mode (M); 4-9 Status Byte Format; 4-9 Static-Sensitive Devices; 7-3 Status Word (U); 4-13

Talk Only Operation; 4-15 Triggering (T); 4-8

Unaddressed; 2-5 Uniline; 2-4 Universal; 2-4, 2-8

Warranty; l-1

Xl Analog Output; 5-2, 6-3 X100 Analog Output; 5-3, 6-3

I-1

Tektronix 5802 Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual