Tektronix Welding System VX4801 User Manual

User Manual

VX4801

Programmable Digital I/O Module

070-9153-03

This document applies for firmware version 1.00

and above.

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WARRANTY

Tektronix warrants that this product will be free from defects in materials and workmanship for a period of three

(3) years from the date of shipment. If any such product proves defective during this warranty period, Tektronix,

at its option, either will repair the defective product without charge for parts and labor, or will provide a

replacement in exchange for the defective product.

In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration

of the warranty period and make suitable arrangements for the performance of service. Customer shall be

responsible for packaging and shipping the defective product to the service center designated by Tektronix, with

shipping charges prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to a

location within the country in which the Tektronix service center is located. Customer shall be responsible for

paying all shipping charges, duties, taxes, and any other charges for products returned to any other locations.

This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate

maintenance and care. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage

resulting from attempts by personnel other than Tektronix representatives to install, repair or service the product;

b) to repair damage resulting from improper use or connection to incompatible equipment; or c) to service a

product that has been modified or integrated with other products when the effect of such modification or

integration increases the time or difficulty of servicing the product.

THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS PRODUCT IN LIEU OF

ANY OTHER WARRANTIES, EXPRESSED OR IMPLIED. TEKTRONIX AND ITS VENDORS

DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A

PARTICULAR PURPOSE. TEKTRONIX’ RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE

PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR

BREACH OF THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY

INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF

WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF

SUCH DAMAGES.

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EC Declaration of Conformity

Tektronix Holland N.V.

Marktweg 73A

8444 AB Heerenveen

The Netherlands

declare under sole responsibility that the

VX4801

meets the intent of Directive 89/336/EEC for Electromagnetic Compatibility.

Compliance was demonstrated to the following specifications as listed in the Official

Journal of the European Communities:

EN 55011

Class A Radiated and Conducted Emissions

EN 50081-1 Emissions:

EN 60555-2

AC Power Line Harmonic Emissions

EN 50082-1 Immunity:

IEC 801-2

IEC 801-3

IEC 801-4

IEC 801-5

Electrostatic Discharge Immunity

RF Electromagnetic Field Immunity

Electrical Fast Transient/Burst Immunity

Power Line Surge Immunity

To ensure compliance with EMC requirements this module must be installed in a

mainframe which has backplane shields installed which comply with Rule B.7.45 of

the VXIbus Specification. Only high quality shielded cables having a reliable,

continuous outer shield (braid & foil) which has low impedance connections to

shielded connector housings at both ends should be connected to this product.

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Table of Contents

Section 1

General Information and Specifications

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 - 1

Controls And Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 - 4

Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 - 4

Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 - 5

LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 - 6

BITE (BuiltĆIn Test Equipment) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 - 7

Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 - 9

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 - 10

Section 2

Preparation For Use

Installation Requirements And Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 - 1

Installation Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 - 2

Installation Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 - 4

Section 3

Operation

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 1

PowerĆup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 2

System Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 2

Module Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 2

Command Syntax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 2

Command Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 3

Command Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 5

SYSFAIL, Self Test, and Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 26

Section 4

Programming Examples

Definition of BASIC Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 1

Programming Example In BASIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 2

Appendices

Appendix A - VXIbus Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A - 1

Appendix B - Input/Output Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A - 7

Appendix C - VXI Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A - 9

Appendix D - User Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A - 17

Appendix E - Performance Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A - 19

VX4801

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General Safety Summary

Review the following safety precautions to avoid injury and prevent damage to

this product or any products connected to it.

Only qualified personnel should perform service procedures.

While using this product, you may need to access other parts of the system. Read

the General Safety Summary in other system manuals for warnings and cautions

related to operating the system.

Injury Precautions

Avoid Electric Overload

To avoid electric shock or fire hazard, do not apply a voltage to a terminal that is

outside the range specified for that terminal.

Do Not Operate Without

Covers

To avoid electric shock or fire hazard, do not operate this product with covers or

panels removed.

Use Proper Fuse

To avoid fire hazard, use only the fuse type and rating specified for this product.

To avoid electric shock, do not operate this product in wet or damp conditions.

Do Not Operate in

Wet/Damp Conditions

Do Not Operate in an

Explosive Atmosphere

To avoid injury or fire hazard, do not operate this product in an explosive

atmosphere.

Product Damage Precautions

Provide Proper Ventilation

To prevent product overheating, provide proper ventilation.

Do Not Operate With

Suspected Failures

If you suspect there is damage to this product, have it inspected by qualified

service personnel.

iii

VX4801 Programmable Digital I/O Module

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General Safety Summary

Safety Terms and Symbols

Terms in This Manual

These terms may appear in this manual:

WARNING. Warning statements identify conditions or practices that could result

in injury or loss of life.

CAUTION. Caution statements identify conditions or practices that could result in

damage to this product or other property.

Terms on the Product

These terms may appear on the product:

DANGER indicates an injury hazard immediately accessible as you read the

marking.

WARNING indicates an injury hazard not immediately accessible as you read the

marking.

CAUTION indicates a hazard to property including the product.

Symbols on the Product

The following symbols may appear on the product:

DANGER

High Voltage

Protective Ground

(Earth) Terminal

ATTENTION

Refer to Manual

Double

Insulated

Certifications and Compliances

Overvoltage Category

Overvoltage categories are defined as follows:

CAT III: Distribution level mains, fixed installation

CAT II: Local level mains, appliances, portable equipment

CAT I: Signal level, special equipment or parts of equipment, telecommunica-

tion, electronics

VX4801 Programmable Digital I/O Module

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min

typ

max

units

Output high voltage (V )

I = –20 mA

4.4

5.0

4.2

l = –6 mA

3.84

Output low voltage (V )

l = 20 mA

0.1

0.5

l = 24 mA

Output low current (l )

Input high voltage (V )

2.0

Input low voltage (V )

0.8

230

5.0

* Input current (l )

Tri-state leakage current (l )

0.5

* There are 22 kW pull-up resistors to + 5V on all I/O and handshake lines to account for floating inputs.

The inputs IC use 1.0 mA max, while the pull-down resistors require 5V / 22 kW = 227.6 mA.

–10 ° to +55 ° C., typical specs at 25° C. A minus sign indicates current flowing out of the card.

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070Ć9153ĆXX

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Appendix E: Performance Verification123

This procedure verifies the performance of the VX4801 Programmable Digital

I/O Module. The test sequences may be performed in your current VXIbus

system if it meets the requirements described in Table 2. Also, it is not necessary

to complete the entire procedure if you are only interested in a specific perfor-

mance area. Some tests depend on the proper operation of previously verified

functions so it is best to follow the order as presented.

The following skills are required to perform this procedure:

Thorough knowledge of test instrument operation and proper measurement

techniques

Knowledge of VXIbus system components and command language

programming

Ability and facility to construct interconnections and fixtures as needed to

perform the procedure

General Information and Conventions

Please familiarize yourself with the following conventions which apply

throughout this procedure:

Each test sequence begins with a table, similar to the one below, which

provides information and requirements specific to that section. The item

number appearing after each piece of equipment refers to an entry in Table 1

Required Test Equipment. Immediately following the table, you will be given

instructions for interconnecting the VX4801 under-test and for checking the

performance parameters. Results may then be recorded on a photocopy of the

Test Record on page A–23.

Equipment

Requirements

Digital Volt Meter (item 1)

Loop-Back Cable Assembly (item 3)

Prerequisites

All prerequisites listed on page A–20

This procedure assume that you will be using the National Instruments PC

GPIB controller and software (NI-488.2M) configured as described in

Table 3. In the test sequences, you will be instructed to issue Interface Bus

Interactive Control (ibic) commands to set up the VX4801 under-test and

other associated VXIbus test instruments. Please refer to the NI-488.2M

User Manual for additional information. If you are using a different

controller or software, simply substitute the equivalent commands.

A–19

VX4801 Programmable Digital I/O Module

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Appendix E: Performance Verification

NOTE. Commands to the VX4801 may be entered in upper or lower case.

However, to avoid confusion between the alphanumeric characters; e.g. one (1)

and L or zero( 0) and o, all commands are shown in the case which provides the

greatest distinction. Use special care when interpreting these characters.

Prerequisites

The verification sequences in this procedure are valid when the following

requirements are met:

The VX4801 module covers are in place and the module is installed in an

approved VXIbus mainframe as described in Section 2 of the Operating

Manual

The VX4801 has passed the power-on self test

The VX4801 is operating in an ambient environment as specified in

Section 1 of the Operating Manual for a warm–up period of at least 10

minutes

Equipment Required

This Procedure uses traceable signal sources and measurement instruments.

Table 1 lists the required equipment. You may use equipment other than the

recommended examples if it meets the minimum requirements.

Table 1: Required Test Equipment

Item Number and Description

Minimum Requirements

Example

Purpose

1. Digital Volt Meter (DVM)

5-1/2 digit, 100 VDC range, accuracy FLUKE 8842A

> 0.002 %.

Checking isolation impedance

2. Digital I/O Module

4 byte TTL/CMOS data I/O

Tektronix VX4801

Checking external functions

3. Loop-Back Cable Assembly

Male DB-50 Connector, two required

(Tektronix part number 131-1344-00)

Assemble as shown in

Figure 4

Checking TTL/CMOS Data

I/O, Tri-State, and Hand-

shake.

Male DB-25 Connectors, are required

(Tektronix part number 131-0570-00)

26 AWG ribbon wire

A–20

VX4801 Programmable Digital I/O Module

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Appendix E: Performance Verification

DB-25 Male

Byte 5 Tri-St

Byte 4 Tri–St

Byte 5 LSB

Byte 4 LSB

DB-50 Male

Byte 2

Byte 3

Byte 3 Tri-St

Byte 0 Tri-St

GND

Byte 3 LSB

Byte 2 MSB

Byte 0 LSB

Byte 1

DAK

DAV

GND

DRd

RFD

Allow approximately 6”

length of interconnect

wire between modules.

Byte 1 Tri-St

Byte 2 Tri-St

VX4801 Under-test

VX4801 Slave Module

Figure 4: Loop-Back Cable Assembly (View of Solder Side)

A–21

VX4801 Programmable Digital I/O Module

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Appendix E: Performance Verification

VX4801 Under-Test Configuration

In order to perform this procedure, the VX4801 under-test must be installed in an

approved VXIbus system. At a minimum, the system must contain the elements

listed in Table 2.

Table 2: Elements of a Minimum VX4801 Under-Test System

Item Number and Description Minimum Requirements

Example

Purpose

1. VXIbus Mainframe

Two available slot for VX4801

under-test and the VX4801 digital

signal source (Slave) in addition to

the Slot 0 controller

Tektronix VX1400A

Provides power, cooling, and

backplane for VXIbus modules

2. Slot 0 Controller

Resource Mgr., Slot 0 Functions,

IEEE 488 GPIB Interface

VX4521 Slot 0 Resource Mgr. Provides Slot 0 functions.,

Resource Mgr., and GPIB/

VXIbus interface

3. VXIbus System Controller VXIbus-Talker/Listener/Controller

IBM 486 PC with National

Provides VXIbus command

Instruments GPIB PC2A card and response interface

& NI-488.2M software, GPIB

cable (Tektronix P/N

012–0991-00)

4. VX4801 Under-Test

5. VX4801-Slave

Not applicable

VX4801

Verify its performance

Provides test signal I/O

4 byte TTL/CMOS I/O

Test System Configuration

Table 3 describes the VXIbus system configuration assumed in this procedure. If

your configuration is different, you do not need to change it, just note that you

will observe your device names and addresses in test sequences. (Note that no

secondary addressing is assumed.)

Table 3: Test System Configuration (Assumed)

GPIB Device

Name

VXIbus Logical GPIB Primary

Address

Device

VXI Slot

(PC card)

Slot 0

GPIB0

VX4521

VX4801

slave

VX4521

0D (hex)

VX4801 under-test

VX4801 slave

Slot 1

Slot 2

A–22

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Appendix E: Performance Verification

Test Record

Photocopy the Test Record, and use it to record the performance verification

results for your module.

Table 4: VX4801 Test Record

VX4801 Serial Number:

Date of Last Calibration:

Certificate Number:

Temperature and Relative Humidity:

Verification Performed by:

Date of Verification:

Table 5: VX4801 Performance Tests

VXIbus Interface Checks

Logical Address, IEEE Address, Slot No., MFG., Model, etc.

Table Command Response

1st. Response

2nd Response

3rd Response

Passed

Failed

Preliminary Tests

Self Test

Interrupt SRQ

TTL/CMOS I/O Data Bytes

Tri-State Control Signals

Internal

External

Handshake Control Signals

Transmit

Receive

A–23

VX4801 Programmable Digital I/O Module

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Appendix E: Performance Verification

Self Test

The VX4801 includes a built-in self test function (BITE) which is automatically

executed each time the power is turned on and when the Internal Self Test (S)

command is issued. BITE uses internal routines and circuitry to confirm basic

I/O functionality. No external test equipment is required.

During self test, all outputs are set to a high impedance (tri-state) mode and then

internal loop-back circuitry and test patterns are used to verify all I/O channels.

In addition to BITE, front panel indicator lights display the current status of

power, the assertion of SYSFAIL*, backplane cycles, data handshake signals,

and individual I/O data bits for each byte. The Query command may also be used

at any time during operation to determine the current state of the module.

Following the VXIbus system startup sequence, the green PWR light on the

VX4801 front panel indicates that the self test has passed and that the +5 V

power supply is operational. If the +5 V power supply fails, or its fuse opens, the

PWR light will be off, the FAILED light will be on, and SYSFAIL* will be

asserted indicating a module failure.

NOTE. If you experience an error indication from the Slot 0 Resource Manager,

the VX4801-under-test, or other VXIbus module, investigate and correct the

problem before proceeding. Common items to check are logical address conflicts

(primary and secondary; see Table 3), breaks in the VXIbus daisy chain signals,

improper seating of a module, loose GPIB cable, improperly set Slot 0 single-

step switch, or loose or blown fuses.

Performance Verification Tests

The order of execution of this procedure has been chosen to minimize system

setup and functional dependency. Because some tests rely on the success of their

predecessors, it is recommended that you perform all sequences in order.

VXIbus Interface

This sequence verifies that the VX4801 configures correctly and communicates

properly with your GPIB system controller.

Equipment

Requirements

No additional test equipment is required for this sequence.

All prerequisites listed on page A–20

Prerequisites

A–24

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Appendix E: Performance Verification

NOTE. If you are using National Instruments NI-488.2 software you may wish to

select the buffer 1 mode to allow more comfortable viewing of the ASCII

response. Just type buffer 1.

1. To verify the system configuration, send the TABLE command to the Slot 0

Resource Manager and confirm the responses shown in Table 6. Your

configuration may not be identical, but the responses should be similar.

Table 6: VXIbus System Configuration

Command to Type

ibic

Response to Verify

ibfind VX4521

ibwrt "table"

ibrd 200

LA 0, IEEE 13, Slot 0, MFG FFDh, MODEL VX4521,

PASS, , RM. .

LA 1, IEEE 01, Slot 1, MFG FFDh, MODEL VX4801,

PASS TRIGGER;LOCK;READ STB, MESG, 0, V1.3,

NORMAL

LA 2, IEEE 02, Slot 2, MFG FFDh, MODEL VX4801,

PASS TRIGGER;LOCK;READ STB, MESG, 0, V1.3,

NORMAL

2. Verify the VX4801 VXIbus interrupt capability with the following steps:

NOTE. Make sure your Slot 0 controller and the VX4801 under-test are set to the

same interrupt level (see User Manual for location of interrupt setting). Also, if

you are using National Instruments NI-488.2 software, make sure Auto Serial

Polling is disabled to prevent the SRQ from being reset prior to a visual check.

a. Enable the generation of VXI Request True interrupt and force a VXIbus

interrupt with an error condition with the following commands:

ibfind VX4801

ibwrt "xae"

(Enable VXI Request True interrupt)

ibwrt "vxi"

(Observe: VX4801 ERR light is on)

A–25

VX4801 Programmable Digital I/O Module

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Appendix E: Performance Verification

ibrd 0

(Observe: VX4521 Slot 0 indicates S in 2nd digit)

NOTE. The zero length read serves to un-address the Slot 0 controller which

allows it to detect the VXIbus interrupt and assert the SRQ.

b. Check that the FAILED light on the VX4801-device-under-test is on and

that the VX4521 displays an S in the second digit of the front panel

indicating an SRQ pending.

c. With the following commands, perform a serial poll with the VX4801

and verify a response of 40 hexadecimal which indicates that it was the

interrupting device. Also, verify that the VX4521 Slot 0 controller SRQ

is no longer asserted. Finally, perform a second serial poll and observe a

response of 0, indicating no interrupt pending:

ibrsp

(Observe: VX4521 no longer displays S)

ibrsp

(Observe: VX4801 response = 0; interrupt cleared)

d. Perform a Status Query (ASCII) and verify that the ERR light is off, and

then read the error message:

ibwrt "qa"

(Observe: VX4801 ERR light is off)

ibrd 100

(Observe: SYNTAX ERROR.. )

TTL/CMOS I/O

This test sequence verifies that each eight bit port (6) of the VX4801 can provide

both active high and low TTL/CMOS inputs and outputs.

Equipment

Loop-back assembly (item 3)

Requirements

Prerequisites

All prerequisites listed on page A–20

1. Attach the loop-back assembly as shown in Figure 4, which connects the odd

bytes to the even bytes respectively (0 to 1, 2 to 3, 4 to 5).

A–26

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Appendix E: Performance Verification

2. Perform a self test and query for any error codes (in ASCII format) with the

VX4801 device-under-test and the Slave VX4801:

ibfind Slave

ibwrt "s;qa"

ibrd 100

(Observe: NO ERRORS)

set VX4801

ibwrt "s;qa"

ibrd 100

(Observe: NO ERRORS)

NOTE. If at any time in this procedure you do not observe the result expected,

check the front panel error light and/or perform an error Status Query (ibwrt

“qa”<cr> ibrd 100<cr>). No additional commands will be accepted until an

error condition is cleared.

3. Verify the odd byte data inputs and the even byte data outputs with the

following steps:

a. Reset the VX4801 to its power-up state and then set its mode for the odd

bytes (1, 3, 5) to be active low inputs, for the even bytes (0, 2, 4) to be

active high outputs loaded with a Load Output value of 55, and set the

tri-state function to be inactive (* => all bytes, i => inactive):

set VX4801

ibwrt "r;m135iL024oh;L024d55;t*i"

b. Perform an input of all bytes and verify a response of 55AA55AA55AA:

ibwrt "i*"

ibrd 100

(Observe: 55AA55AA55AA)

c. Repeat the previous test with the logic sense reversed; i.e. odd bytes (1,

3, 5) set to active high and the even bytes set to active low. Verify the

complementary response:

ibwrt "m135ih024oL"

ibwrt "i*"

ibrd 100

(Observe: AA55AA55AA55)

A–27

VX4801 Programmable Digital I/O Module

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Appendix E: Performance Verification

4. To verify the even byte data inputs and the odd byte data outputs, reset the

VX4801 to its power-up state and then set its mode for the even bytes (0, 2,

4) to be active low inputs, for the odd bytes (1, 3, 5) to be active high

outputs loaded with a Load Output value of 55, and set the tri-state function

to be inactive. Perform an input of all bytes and verify an AA55AA55AA55

response and then reverse the logic sense of the even and odd bytes and

verify the complementary response of 55AA55AA55:

ibwrt "r;m024iL135oh;L135d55;t*i"

ibwrt "i*"

ibrd 100

(Observe: AA55AA55AA55)

ibwrt "m024ih135oL"

ibwrt "i*"

ibrd 100

(Observe: 55AA55AA55AA)

Tri-State Function

This test sequence verifies that the internal tri-state commands and the external

tri-state signals are functioning properly for each I/O byte.

NOTE. Each I/O signal has an internal 22 kW pull-up to +5 V which will appear

as a high logic level when the in tri-state mode.

Equipment

Loop-back assembly (item 3)

Requirements

Prerequisites

All prerequisites listed on page A–20

1. Install the loop-back assembly on the VX4801 under-test and the slave

VX4801 as shown in Figure 4.

2. Verify the internal tri-state command with the following steps:

a. Reset the VX4801 to its power-on default state (all bytes initially

tri-stated). Then set its mode for the odd bytes to be active high inputs

and for even bytes to be active high outputs with a Load Output value of

00. Finally, leave the even (output) bytes tri-stated, but set the odd

(input) byte tri-states to be inactivate. Perform an input of all bytes and

verify that the even bytes are in tri-state mode and not driving the odd

byte inputs (odd inputs not pulled low):

set VX4801

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Appendix E: Performance Verification

ibwrt "r;m135ih024oh;L024d00;t135i"

ibwrt "i*"

ibrd 100

(Observe: response of 00FF00FF00FF)

b. Repeat the above test, this time with the even bytes set as inputs and the

odd bytes set as tri-stated outputs. Perform an input of all bytes and

verify that the even bytes are in tri-state mode and not driving the even

byte inputs (even inputs not pulled low):

ibwrt "r;m024ih135oh;L135d00;t024i"

ibwrt "i*"

ibrd 100

(Observe: response of FF00FF00FF00)

3. Verify the external tri-state signals with the following steps:

a. Set up the Slave VX4801 to disable the external tri-state signals (ETS0 -

ETS5) to the VX4801 device-under-test:

set slave

ibwrt "r;m0oh;L0dFF;t0i"

b. Set up the VX4801-device-under-test for odd bytes to be inputs, for even

bytes to be outputs with a Load Output value of 00, and for internal

tri-state to be inactive for all bytes. Read all bytes and verify the 00

output value on all bytes (internal tri-state inactive):

set VX4801

ibwrt "r;m135ih024oh;L024d00;t*i"

ibwrt "i*"

ibrd 100

(Observe: response of 000000000000)

c. Set the Slave to assert the external tri-state signals to the even bytes of

the VX4801 and verify a response of 00FF00FF00FF:

set slave

ibwrt "L0daa"

ibwrt "i*"

set VX4801

A–29

VX4801 Programmable Digital I/O Module

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Appendix E: Performance Verification

ibwrt "i*"

ibrd 100

(Observe: response of 00FF00FF00FF)

d. Set the Slave to un-assert external tri-state signals. Then set the VX4801

for the odd bytes to be inputs, for the even bytes to be outputs with a

Load Output value of 00, and for internal tri-state to be inactive for all

bytes. Read all bytes and verify the 00 output value on all bytes (internal

tri-state inactive):

set slave

ibwrt "L0dFF"

ibwrt "i*"

set VX4801

ibwrt "r;m024ih135oh;L135d00;t*i"

ibwrt "i*"

ibrd 100

(Observe: response of 000000000000)

e. Set the Slave to assert the external tri-state signals to the odd bytes of the

VX4801 and verify a response of FF00FF00FF00:

set slave

ibwrt "L0d55"

ibwrt "i*"

set VX4801

ibwrt "i*"

ibrd 100

(Observe: response of FF00FF00FF00)

A–30

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Appendix E: Performance Verification

Check Handshake

This test sequence verifies that data can be transferred to and from the VX4801

using the four handshake signal lines Data Ready (DRD), Data Acknowledge

(DAK), Ready for Data (RFD), and Data Available (DAV).

NOTE. Typing errors will result in a VX4801 error condition which must be

cleared before subsequent commands will be recognized. If at any time you

suspect that an error condition exists, send an error query and read the result

before continuing with the test sequence (ibwrt “qa” <cr>, ibrd 100 <cr>).

Equipment

Loop-back assembly (item 3)

Requirements

Prerequisites

All prerequisites listed on page A–20

1. Connect the loop-back assembly as shown in figure 4.

2. Using the following steps, verify a data byte transfer 55 hexadecimal from

the VX4801 (byte 5) to the Slave (byte 3) using the Ready for Data (RFD)

from the Slave and the Data Valid (DAV) from the VX4801:

a. Set the VX4801 for a positive edge handshake, to update the output data

on receipt of a Ready For Data (RFD) strobe, to update the input data on

receipt of a Data Ready (DRD) strobe, and for byte 5 to be an active high

output, initialized with a Load Output data value of 55 hexadecimal and

with its tri-state inactive:

set VX4801

ibwrt "r;p*+;urd;m5oh;L5d55;t5i"

b. Set the Slave mode for byte 2 to be an active high output (for assertion

of RFD), for bytes 1 and 3 to be active high inputs (byte 1 to detect DAV

and byte 3 to input data), and for all tri-states to be inactive:

set Slave

ibwrt "r;m2oh13ih;t*i"

c. Set the Slave to input byte 1 (with all bits masked except bit 1) and

byte 3 and verify that DAV is un-asserted (i.e. byte 1, bit 0 = 0) and

consequently, that there is no data (byte 3 = 00):

ibwrt "i1&01/3"

ibrd 100"

(Observe: 0000 and VX4801 DAV light off)

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Appendix E: Performance Verification

d. Set the Slave to initialize byte 2 with an Output Data value of 01 (asserts

RFD to the VX4801) and verify that the VX4801 correspondingly

asserts DAV:

ibwrt "L2d01"

(Observe: VX4801 DAV light on)

e. Set the Slave to input bytes 1 and 3 and verify receipt of DAV (byte 1

bit 1 = 1) and data (byte 3 = 55):

ibwrt "i1&01/3"

ibrd 100

(Observe: 0155 return value)

3. Using the following steps, verify a data byte transfer (AA hex) from the

Slave (byte 5) to the VX4801 (byte 3) using the Data Ready (DRD) and Data

Acknowledge (DAK) handshake lines:

a. Set the Slave mode for byte 2 and 3 to be active high outputs, with

byte 3 initialized to a Load Output data value of AA, and set all tri-states

to be inactive:

ibwrt "r;m23oh;L3dAA;t*i"

b. Set the VX4801 for a positive edge handshake, to update the output date

on receipt of a DRD strobe, to update the input data on receipt of a DRD

strobe, and for byte 5 to be an active high input with its tri-state inactive

(note that after the data is strobed in with DRD from the slave, the

VX4801 will in turn generate the DAK, but only after the controller has

read the data byte):

set VX4801

ibwrt "r;p*+;urd;m5ih;t5i"

c. Send a byte 5 input command to the VX4801, and verify that a response

of N, indicating that the module is waiting for a DRD strobe:

ibwrt "i5"

ibrd 100

(Observe N; waiting for DRD strobe)

d. Set the Slave to send a DRD strobe (byte 2, bit 2) and then verify that

the VX4801 DAK light is off:

set Slave

ibwrt "L2d02"

(Send DRD to VX4801; observe DAK light off)

A–32

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Appendix E: Performance Verification

e. Send a byte 5 input command to the VX4801 and verify that the DAK

light is on. Then read the data, observe a response of AA, perform a

second read and observe that the VX4801 is again waiting for a DRD

strobe:

set VX4801

(Observe VX4801 DAK light off)

ibwrt "i5"

(Observe DAK light on)

ibrd 100

(Observe AA response)

ibwrt "i5"

ibrd 100

(Observe N response, indicating waiting for DRD)

This completes the VX4801 verification procedure.

A–33

VX4801 Programmable Digital I/O Module

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