IOTech Digital488 User Manual

Digital488/80A User's Manual

80-Bit IEEE 488 / Digital I/O Interface

the smart approach to instrumentation ™

IOtech, Inc.

25971 Cannon Road

Cleveland, OH 44146-1833

Phone: (440) 439-4091

Fax: (440) 439-4093 E-mail: Internet: www.iotech.com

Digital488/80A User's Manual

80-Bit IEEE 488 / Digital I/O Interface

p/n 196-0901 Rev 1.2

Released Per EO # 1941R5

sales@iotech.com

Warranty Information

Your IOtech warranty is as stated on the product warranty card. You may contact IOtech by phone, fax machine, or e-mail in regard to warranty-related issues. Phone: (440) 439-4091, fax: (440) 439-4093, e-mail: sales@iotech.com

Limitation of Liability

IOtech, Inc. cannot be held liable for any damages resulting from the use or misuse of this product.

All IOtech documentation, software, and hardware are copyright with all rights reserved. No part of this product may be copied, reproduced or transmitted by any mechanical, photographic, electronic, or other method without IOtech’s prior written consent. IOtech product names are trademarked; other product names, as applicable, are trademarks of their respective holders. All supplied IOtech software (including miscellaneous support files, drivers, and sample programs) may only be used on one installation. You may make archival backup copies.

CE Notice

Many IOtech products carry the CE marker indicating they comply with the safety and emissions standards of the European Community. As applicable, we ship these products with a Declaration of Conformity stating which specifications and operating conditions apply.

Warnings, Cautions, Notes, and Tips

Refer all service to qualified personnel. This caution symbol warns of possible personal injury or equipment damage under noted conditions. Follow all safety standards of professional practice and the recommendations in this manual. Using this equipment in ways other than described in this manual can present serious safety hazards or cause equipment damage.

This warning symbol is used in this manual or on the equipment to warn of possible injury or death from electrical shock under noted conditions.

This ESD caution symbol urges proper handling of equipment or components sensitive to damage from electrostatic discharge. Proper handling guidelines include the use of grounded anti-static mats and wrist straps, ESD-protective bags and cartons, and related procedures.

This symbol indicates the message is important, but is not of a Warning or Caution category. These notes can be of great benefit to the user, and should be read.

In this manual, the book symbol always precedes the words “Reference Note.” This type of note identifies the location of additional information that may prove helpful. References may be made to other chapters or other documentation.

Tips provide advice that may save time during a procedure, or help to clarify an issue. Tips may include additional reference.

Specifications and Calibration

Specifications are subject to change without notice. Significant changes will be addressed in an addendum or revision to the manual. As applicable, IOtech calibrates its hardware to published specifications. Periodic hardware calibration is not covered under the warranty and must be performed by qualified personnel as specified in this manual. Improper calibration procedures may void the warranty.

Quality Notice

IOtech has maintained ISO 9001 certification since 1996. Prior to shipment, we thoroughly test our products and review our documentation to assure the highest quality in all aspects. In a spirit of continuous improvement, IOtech welcomes your suggestions.

Introduction to this Manual

This manual covers the setup and operation of the Digital488/80A 80-bit IEEE 488 / Digital I/O interface system. This manual is organized as follows:

• Chapter 1 - Digital488/80A Overview gives an overview of the basic features of a Digital488/80A

system. Digital488/80A accessories and specifications are also provided.

• Chapter 2 - Digital488/80A Setup explains in detail the various hardware features of the

Digital488/80A unit.

• Chapter 3 - Digital488/80A Power & Assembly provides detailed instructions on line-voltage

selection and fuse replacement, rack-mount and bench-top installation, as well as power-up activation.

• Chapter 4 - Digital488/80A Operation explains the Digital488/80A internal operation. Descriptions

of the handshaking/control lines, as well as IEEE 488 bus support, are provided.

• Chapter 5 - IEEE 488 Background describes the history and the basic concepts of IEEE 488

operation, including the various IEEE 488 bus lines and bus commands.

• Chapter 6 - Digital488/80A Commands discusses the entire command set covering the

Digital488/80A unit. The command syntax, groups, and reference are provided. The description format of the individual commands includes the command type, syntax, description, and an example program excerpt.

• Chapter 7 - Troubleshooting provides a reference for possible solutions to technical problems. Before

calling for technical assistance, refer to this chapter.

• Appendix A provides the Digital488/80A HVCX1 Configuration Record for recording hardware and

software settings, and recording DB-50 connector wiring information.

• Appendix B provides background information concerning the IEEE 488 bus, the serial bus, and ASCII

controls.

• The Index provides a comprehensive alphabetical listing of the main terms and topics in this manual.

Also, the Abbreviations on the last pages of this manual, provides an overall list of abbreviations, including acronyms and ASCII control codes, as an additional reference for this manual and for other related literature.

CAUTION

Using this equipment in ways other than described in this manual can cause personal injury or equipment damage. Before setting up and using your equipment, you should read all documentation that covers your system. Pay special attention to cautions and warnings formatted like this one.

Digital488/80A User’s Manual i

1 - Digital488/80A Overview

Introduction…… 1

Addressing Modes…… 1 Digital I/O Lines…… 1 Handshaking/Control Lines…… 1 HVCX1 High Voltage/Current Interface

Option…… 2 Power-Up & Setup Configuration…… 2 Internal Buffer…… 2 Software Programmable Features…… 2

Accessories…… 2 Specifications…… 3

Digital I/O…… 3 IEEE 488…… 3 General…… 3 Data Transfer Speeds…… 4

2 - Digital488/80A Setup

The Package…… 5 Hardware Setup…… 6

Front & Rear Panel Layouts…… 6 Default DIP Switch Settings…… 7 IEEE 488 Bus Address Selection…… 7 Addressing Mode Selection…… 7

Dual Primary Addressing Mode…… 8 Secondary Addressing Mode…… 8

HVCX1 Option Setup…… 10

Determining Ports Setup…… 11 To Set Up Input Ports…… 12 To Set Up Handshaking Input Lines…… 13 To Set Up Output Ports…… 14 To Set Up Handshaking Output Lines…… 14 To Install the HVCX1 Option…… 16

Digital I/O Ports…… 17

Using the HVCX1 Option for High Voltage/Current

Options…… 18

3 - Digital488/80A Power & Assembly

Introduction…… 19

Internal Components…… 19 Factory Service…… 19

Power Line & Fuse Configuration…… 20

Line Voltage Selection…… 20

To Select the Line Voltage…… 21

Fuse Replacement…… 22

To Replace the Fuse…… 22

Rack-Mount & Bench-Top Assembly…… 23

Rack Mount…… 23 Bench Top…… 23

Power-Up & Programming Tests…… 24

Power-Up Activation…… 24 Programming Examples……25

KYBDCTRL.BAS Program…… 25 To Run the Keyboard Controller Program…… 25 Digital488/80A Command Responses…… 26

4 - Digital488/80A Operation

Introduction…… 29 Handshaking/Control Lines…… 29

Clear (Pin 41)…… 30 Data Strobe (Pin 42)…… 30 Trigger (Pin 43)…… 30 Inhibit (Pin 44)…… 31 Service (Pin 45)…… 31 External Data Ready (Pin 46)…… 31

IEEE 488 Bus Support…… 32

Bus Lines…… 32 Bus Commands…… 32 Bus Addresses…… 34 Bus Terminators…… 34

5 - IEEE 488 Background

History…… 35 General Bus Structure…… 35 Bus Lines & Bus Commands…… 36

Bus Management Lines…… 36 Handshake Lines…… 37 Data Transfer Lines…… 37 Bus Command Groups…… 38 More On Service Requests…… 39

6 - Digital488/80A Commands

Introduction…… 41 Command Syntax…… 42 Command Set & Support…… 43 Command Summary…… 44 Command Reference…… 46

A - Bit Set…… 47 B - Bit Clear…… 48 C - Configuration…… 49 D - Data Output…… 50 E? - Query Error Status…… 51 F - Data Format…… 53 G - Bus Input/Output…… 57 H - Handshake…… 58 I - Invert…… 59 K - End-Or-Identify…… 60 L - Buffer…… 61 M - Service Request Mask…… 62 O - Recall Configuration…… 63 P - Port Select…… 64 Q - Inhibit…… 65 R - Data Ready…… 66 S - Save Configuration…… 67 T - Test…… 68 U - User Status…… 69 V - View Configuration…… 72 V? - View Version…… 73 X - Execute…… 74 Y - Bus Terminator…… 75 ? - Query…… 76 Serial Poll Status Byte…… 77

ii Digital488/80A User’s Manual

7 - Troubleshooting

Radio Interference Problems…… 79 Electrostatic Discharge (ESD) Damage……

Other Issues…… 79

Power-Up Activation…… 79 Buffer Overrun…… 80 Query Error Status…… 80

A - Appendix A

Digital488/80A HVCX1 Configuration

Record…… 81

Hardware Setup…… 81 Software Setup…… 82 DB-50 Connector Wiring Reference…… 83

B - Appendix B

IEEE 488 Bus & Serial Bus Lines…… 81 IEEE 488 Bus Commands…… 86 ASCII Codes…… 87

ASCII Code Summary…… 87

Decimal Values 00 to 63 - ACG, UCG & LAG……

Decimal Values 64 to 127 - TAG & SCG…… 88

ASCII Code Details…… 89

Decimal Values 00 to 31 - ACG & UCG

Characteristics…… 89

Decimal Values 00 to 31 - ACG & UCG

Descriptions…… 90 Decimal Values 32 to 63 - LAG…… 91 Decimal Values 64 to 95 - TAG…… 92 Decimal Values 96 to 127 - SCG…… 93

Index…… 95 Abbreviations…… 98

Digital488/80A User’s Manual iii

 Notes

iv Digital488/80A User’s Manual

Digital488/80A Overview 1

Introduction…… 1

Addressing Modes…… 1 Digital I/O Lines…… 1 Handshaking/Control Lines…… 1 HVCX1 High Voltage/Current Interface Option…… 2 Power-Up & Setup Configuration…… 2 Internal Buffer…… 2 Software Programmable Features…… 2

Accessories…… 2 Specifications…… 3

Digital I/O…… 3 IEEE 488…… 3 General…… 3 Data Transfer Speeds…… 4

Introduction

The Digital488/80A is a digital input and output interface to the IEEE 488 bus that enables an IEEE 488 controller to program 80 bits of TTL level signals as either inputs or outputs. It includes six handshake/control lines for each 40-bit channel and two addressing modes. The unit is fully programmable, including the power-up configuration, which is stored in non-volatile RAM. The internal data buffer in the Digital488/80A can store up to 2,000 40-byte words. With the addition of the HVCX1 High Current/High Voltage Interface option, the I/O lines can be configured as high voltage inputs or as high current/high voltage outputs to allow interfacing with solenoids, switching relays and other high voltage/high current devices.

Addressing Modes

Two addressing modes are available in the Digital488/80A. Dual primary addressing permits two channels to reside at two consecutive primary IEEE 488 bus addresses. Secondary addressing allows two channels to reside at the same primary IEEE 488 bus address with two consecutive secondary addresses.

When addressed to Talk, the Digital488/80A outputs data from all forty bits of the selected channel or a selected eight bit port. When addressed to Listen, the unit accepts input data and programming information from the controller and outputs the data to the appropriate I/O port.

Digital I/O Lines

The Digital488/80A has 80 TTL level digital I/O lines that are divided into two 40-bit channels. Each channel is divided into five eight-bit ports. Six high level ASCII commands configure the ports to be all inputs, all outputs or combinations in between. Thus, a configuration can range from 80 input lines to 80 output lines or combinations in between in multiples of 8 bits.

Handshaking/Control Lines

Each 40-bit channel has six handshaking/control lines. The Clear (Pin 41) output line is pulsed whenever a Device Clear (

DCL) or Selected Device Clear (SDC) command is received from the IEEE 488 controller.

The Data Strobe (Pin 42) output is pulsed when the IEEE 488 controller presents new data on the I/O lines. The Trigger (Pin 43) output signal is pulsed when a Group Execute Trigger (

GET) command is received on

the bus. The Inhibit (Pin 44) output line is asserted while the IEEE 488 controller is reading data from input lines. The Service (Pin 45) line is an edge-triggered input that generates a Service Request on the bus. The External Data Ready (Pin 46) input line is used to latch digital input data on the I/O lines.

Digital488/80A User’s Manual Digital488/80A Overview 1

HVCX1 High Voltage/Current Interface Option

The HVCX1 option permits the I/O lines to be configured as high voltage (up to 50 V) inputs or as high voltage/high current outputs (up to 200 mA sink capability) to allow interfacing with solenoids, switching relays and other high voltage/high current devices using an external voltage source. It allows interfacing to non-TTL level devices by offering compatibility with 12, 24 and 48 volt logic. The individual 8-bit ports can be configured to control high current open collector drivers. Each high current driver has an internal fly-back diode for protection when switching inductive devices such as relays. When the HVCX1 option is used, the six handshake and control lines can also interface to 12, 24, or 48 volt logic.

Power-Up & Setup Configuration

The Digital488/80A allows up to 100 configurations for each channel to be created. The configurations are stored in non-volatile memory, which enables the input/output status and logic level of every I/O line to be defined when power is applied. The configurations can be called from a single pre-defined command from the IEEE 488 controller. This allows easy configuration of the device for a variety of applications.

Internal pull-up resistors ensure a logic "high" the instant power is applied. When using the HVCX1 option with high current driver outputs, the internal pull-up resistors ensure that the high current driver outputs are switched off the instant power is applied -- a requirement for process control applications.

Internal Buffer

A built-in data buffer in the Digital488/80A can store up to 8,000 bytes, which is large enough to capture two thousand patterns from one 40-bit I/O channel. When interfacing to slow devices, the data buffer relieves the controller of the need to constantly read data from the Digital488/80A.

Software Programmable Features

The software programmable features on the Digital488/80A include data formats, individual bit set and bit clear commands and terminators. The six available data formats are ASCII hexadecimal, ASCII character, ASCII binary, binary, high speed binary and ASCII decimal. The programmable terminators facilitate interfacing to various controllers. Using the User Status ( programmed status of the Digital488/80A at any time. With the Query ( Digital488/80A command, user-defined status command strings can be built to request the status information needed for a given application.

Accessories

Additional accessories that can be ordered for the Digital488/80A include:

• CA-1: Power cable

• CA-7-1: 1.5-foot IEEE 488 cable

• CA-7-3: 6-foot shielded IEEE 488 cable

• CA-7-4: 6-foot reverse entry IEEE 488 cable

• CA-88: 6-foot 50-pin D-shell ribbon cable

• CN-20: Right-angle IEEE 488 adapter, male and female

• CN-22: IEEE 488 multi-tap bus strip, four female connectors in parallel

• CN-23: IEEE 488 panel-mount feed-through connector, male and female

U) command, the controller can check the

?) option offered with each

2 Digital488/80A Overview 11-07-02 Digital488/80A User's Manual

Specifications

Digital I/O

Terminal Installation Category: Standard: Not Applicable. CE: Category 1. Digital I/O Capability: Dual Channels, each with five 8-bit ports, programmable as inputs or outputs.

Also included per channel are programmable handshake lines, data latching cap ability, a Service Request (SRQ) input and Clear and Trigger outputs.

Logic Levels: Outputs drive 2 TTL loads (3.2 mA). Optional 12, 24, 48 volt logic support available with

the HVCX1 High Voltage/Current Interface option.

High-Current Outputs: With the HVCX1 option, the outputs can be configured, in groups of eight, as

high current outputs. Each high-current output is capable of sinking up to 200 mA at 50 VDC maximum. Total current sinking capability is 8 A maximum.

Update Rate: In binary mode, the Digital488/80A can update one 40-bit I/O channel at over 2 Kbytes per

second.

I/O Port Connections: Two 50-pin male D-shell connectors. Mating solder tab connectors are supplied. Input Ranges, Nominal Logic Low/High Voltages (±10%), and Input Resistances (HVCX1 option

only):

0-5 Volt Range: 0.8 volts low / 2.4 volts high; 15 Kohms. 0-12 Volt Range: 1.9 volts low / 5.75 volts high; 35 Kohms. 0-24 Volt Range: 4.2 volts low / 11.5 volts high; 61 Kohms. 0-48 Volt Range: 8.4 volts low / 23 volts high; 135 Kohms.

Please read this manual carefully! If equipment is used in any manner not specified in this manual, the protection provided by the equipment may be impaired.

CAUTION

IEEE 488

General

The IEEE 488 terminal must only be used to control a non-isolated IEEE 488 system. The common mode voltage (cable shell to earth) must be zero.

Terminal Installation Category: Standard: Not Applicable. CE: Category 1. Implementation: SH1, AH1, T4, TE8, L4, LE4, SR1, RL0, PP0, DC1, DT1, C0, E1. Terminators: Ignored on input. Selectable CR, LF, LF-CR or CR-LF, with or without EOI. Programmable: IEEE Bus Terminators, EOI Control, SRQ Mask, Port Data, Active Levels, Handshake

Lines, Format, and Configuration.

Connector: Standard IEEE 488 connector with metric studs.

WARNING

Service: Fuse replacement and the changing of selected line voltage must be performed by qualified service personnel. Never open the case while it is connected to the AC line. Internal voltage potentials exist which could cause bodily injury or death.

CAUTION

Digital488/80A User’s Manual Digital488/80A Overview 3

Terminal Installation Category: Standard: Not Applicable. CE: Category 2 for Line Voltage Input

terminal. All other terminals are Category 1.

Dimensions: 425 mm wide x 45 mm high x 203 mm deep (16.75" x 1.75" x 8"). Weight: 2 kg. (4.5 lbs). Environment: Standard: Indoor use, 0° to 50°C; 0 to 95% RH (non-condensing).

CE: Indoor use at altitudes below 2000 meters, 0° to 40°C; 0 to 80% RH up to 31°C decreasing linearly 4% RH/°C to 40°C.

Controls: Power switch (external), line voltage selection switch (internal), and DIP switch (external) for

IEEE 488 addressing mode and IEEE 488 address.

Indicators: LED indicators for TALK, LISTEN, SRQ, ERROR, TEST and POWER. Power: Internally selectable 105-125 or 210-250 VAC; 50/60 Hz, 30 VA maximum. Fuse: 1/2A Slo Blo 3AG (for 105-125 V power line) or 1/4A Slo Blo 3AG (for 210-250 V power line).

CAUTION

Line Voltage: The protective conductor terminal on the AC line connector must be connected to an external protective earthing system. Failure to make such a connection will impair protection from shock.

CAUTION

Fuse Failure: Fuse failure indicates a possible problem within the device circuitry. If a fuse blows, contact a qualified service representative. Replacement fuses are to be installed by qualified service personnel with the unit disconnected from the power source and with all other terminals disconnected. If the line voltage selector is changed, then the fuse designated for that line voltage must be used.

Data Transfer Speeds

The Digital488/80A has been measured to perform at the approximate speeds listed below. The testing was done in such a way that the limiting factor was the Digital488/80A and not the IEEE 488 bus controller driving it. All explanations discuss only one channel although the specifications given are valid for either channel.

• Collection and Storage of Data: The Digital488/80A has an internal data buffer capable of storing

2000 readings of 40-bit data per channel. When operating in the buffered on an External Data Ready transition), a transition on the EDR input causes the Digital488/80A to collect the current value of all 40 bits and store the reading in the buffer. This collection and storage of 40 bits of data can occur at a maximum rate of once every 140 microseconds.

• Output of Data to Ports: When sending data to the outputs on a Digital488/80A channel, the fastest

format mode is high-speed binary mode: Format ( data are accepted from the bus and sent directly to the Digital488/80A outputs (all 40 bits). This constitutes one data transfer. The data transfer rate in this mode is approximately 1400 transfers per second.

• IEEE 488 Bus Communication: The fastest data transfer rate across the IEEE 488 bus to the

IEEE 488 controller is approximately 1 byte every 140 microseconds whether reading data from the internal data buffer, or accepting commands or data from the bus.

• Transistor-Transistor Logic (TTL) Levels: The data and handshake output lines drive two TTL loads.

In addition, Ports 1 and 2 on each channel can function as 5-volt CMOS-compatible outputs. All input lines are less than 1.5 TTL loads. Normal precautions should be taken to limit the input voltages to the range of -0.3 to +7.0 volts. All I/O lines are referenced to I/O Common (Ground; DB-50 Pin 50).

R2 mode (data are latched and

F) command F5. In this mode, 5 bytes of binary

4 Digital488/80A Overview 11-07-02 Digital488/80A User's Manual

Digital488/80A Setup 2

The Package…… 5 Hardware Setup…… 6

Front & Rear Panel Layouts…… 6 Default DIP Switch Settings…… 7 IEEE 488 Bus Address Selection…… 7 Addressing Mode Selection…… 7

Dual Primary Addressing Mode…… 8 Secondary Addressing Mode…… 8

HVCX1 Option Setup…… 10

Digital I/O Ports…… 17

Using the HVCX1 Option for High Voltage/Current Options…… 18

The Package

All Digital488/80A components are carefully inspected prior to shipment. When you receive your IEEE 488 / digital I/O interface, carefully unpack all items from the shipping carton and check for any damage which may have occurred during shipment. Promptly report the damage to the shipping agent and your sales representative. Retain all shipping materials in case you must return the unit to the factory.

Every Digital488/80A package includes the following items listed by part number:

• Digital488/80A: 80-Bit IEEE 488 / Digital I/O Interface

• 196-0901: Digital488/80A User’s Manual

• PR-2: Warranty Card

• 196-0800: Accessories Kit for Digital488/80A, which includes the following:

• CA-1: Power Cable

• HA-41-6: Rack Screws (4)

• FE-1: Rubber Feet (4)

• EN-6: Rack Ears (2)

• FU-1-.25: 1/4A Replacement Fuse

• FU-1-.5: 1/2A Replacement Fuse

• CN-18-50: Mating Connector for DB-50 (2)

In addition, if the High Voltage/Current Interface Option (HVCX1) is included, you will have the following items:

• 196-4050: PCB Sub-Assembly, which includes a HVCX1 High Voltage/Current Interface

• 196-0801: Accessories Kit, HVCX1 Option for Digital488/80A, which includes the following:

• RN-3-20K: 20 Kohms Resistor, 16-pin DIP Pack (12)

• RN-3-56K: 56 Kohms Resistor, 16-pin DIP Pack (12)

• RN-3-120K: 120 Kohms Resistor, 16-pin DIP Pack (12)

• RN-9-27K: 27 Kohms Pullup Resistor, 9-pin SIP Pack (10)

Digital488/80A User’s Manual 11-08-02 Digital488/80A Setup 5

Hardware Setup

Do not use the Digital488/80A unit outdoors! This unit is intended for indoor use only! Unexpected outdoor conditions could result in equipment failure, bodily injury or death!

Front & Rear Panel Layouts

Six LED indicators on the Digital488/80A front panel, display the unit status. The following list describes the functions of these indicators:

• TALK: ON when Digital488/80A is in the Talker state; OFF when in the Idle or Listener state.

• LISTEN: ON when Digital488/80A is in the Listener state; OFF when in the Idle or Talker state.

• SRQ: ON when Digital488/80A generated a service request; OFF when no SRQ is pending.

• ERROR: ON when an error has occurred; OFF when no error condition exists.

WARNING

• TEST: ON when used in conjunction with the Test (

T) command to verify that communication has

been established with the Digital488/80A.

• POWER: ON when power is being applied while the power switch is in the ON position; OFF when

power is not present.

6 Digital488/80A Setup Digital488/80A User's Manual

Default DIP Switch Settings

The Digital488/80A unit may be operated from either 110 VAC or 220 VAC. The operating voltage is set by an internal switch. The factory set operating voltage appears on the label placed over the power jack on the rear panel. To change the operating voltage, see section Line Voltage Selection in Chapter 3: Digital488/80A Power & Assembly.

The Digital488/80A unit has one 8-microswitch DIP switch (S1) accessible from the rear panel. This DIP switch determines the IEEE 488 bus address and its addressing mode. The switch is read only when the unit is powered on and should be set prior to applying power. The figure illustrates the factory default for the DIP microswitch settings: IEEE 488 bus address = 8, and Addressing Mode = Dual Primary. In the Dual Primary addressing mode, DIP microswitches 6 and 7 are ignored.

Note: DIP switch S1 is read only during power up. For this reason you must make any setting changes

prior to applying power to the unit.

To modify the default settings, disconnect the power cord from the AC line and change the microswitch settings using a small screwdriver. The enclosure does not need to be opened to change the DIP microswitch settings.

IEEE 488 Bus Address Selection

The IEEE 488 bus address is set by positioning the rear-panel DIP microswitches 1 through 5. The address can be set from 0 through 30 and is read only at power on. The address is selected by simple binary weighting with microswitch 1 being the Least Significant Bit (LSB; with a value of 1) and microswitch 5 the Most Significant Bit (MSB; with a value of 16). The factory default setting is address 8, as shown in the diagram.

Note: If address 31 is selected, it defaults to

address 30 because the IEEE 488 standard has reserved address 31.

Note: The Digital488/80A bus address must

agree with the IEEE 488 controller address.

Addressing Mode Selection

The Digital488/80A can be operated in one of two addressing modes: Dual Primary addressing mode or Secondary addressing mode, which are selected by the rear-panel DIP microswitch 8. The factory default setting for microswitch 8 is Dual Primary addressing mode, in the "up" position as shown in the diagram. A detailed description of the Dual Primary and Secondary addressing modes is provided in the following text.

Digital488/80A User’s Manual 11-08-02 Digital488/80A Setup 7

Dual Primary Addressing Mode

The Digital488/80A can be thought of as two identical IEEE 488-to-digital I/O interfaces. Each interface occupies one bus address and has one I/O channel. For this reason the Digital488/80A occupies two bus addresses in an IEEE 488 system.

The default addressing mode on the Digital488/80A is "Dual Primary,” in which two consecutive bus addresses are used. Dual Primary addressing offers ease of use at the expense of two bus address locations. This may not be practical for applications in which the bus address locations are required by other equipment. In these situations, “Secondary" addressing mode may be used. Secondary addressing uses a single bus address for multiple interfaces.

When Dual Primary addressing mode is selected with DIP microswitch 8 in the "up" position, then microswitch 1 (LSB of the address) is ignored. The Channel 0 interface resides at an even numbered bus address, while the Channel 1 interface resides at the next higher odd address. For example, if the address switches are set for IEEE 488 bus address 8, Channel 0’s interface resides at bus address 8 and Channel 1’s interface resides at bus address 9.

Note: Because the IEEE 488 standard has reserved address 31, if address 30 is selected when in Dual

Primary addressing mode, then the Digital488/80A defaults to address 28 for Channel 0, and to address 29 for Channel 1.

Secondary Addressing Mode

When Secondary addressing mode is selected with DIP microswitch 8 in the "down" position, then up to four Digital488/80A units can reside at the same primary bus addresses. The Secondary addresses at which Channel 0 and Channel 1 reside, are selected with microswitches 6 and 7, as indicated in the adjacent figure.

Note: When in the Secondary address mode, if

IEEE 488 primary address 31 is selected, the Digital488/80A unit will automatically default to primary address

30.

For example, if two Digital488/80A units are configured for primary address 08, with the first unit being configured for Secondary addresses 0 and 1, and the second unit configured for Secondary addresses 2 and 3, then the communication is as indicated by the following table.

Communication Example

To Communicate With: Use Primary Address: Use Secondary Address:

Unit 1 Channel 0 08 00

Channel 1 08 01

Unit 2 Channel 0 08 02

Channel 1 08 03

1 0

N/A

2 3

Addresses 0 and 1

N/A

2 3

Addresses 4 and 5

N/A

6 7 8

D/S

N/A

2 3

Addresses 2 and 3

N/A

2 3

Addresses 6 and 7

Secondary Address Settings

N/A

6 7 8

D/S

8 Digital488/80A Setup Digital488/80A User's Manual

The following figure compares the Dual Primary and the Secondary addressing modes.

Digital488/80A User’s Manual 11-08-02 Digital488/80A Setup 9

HVCX1 Option Setup

If you would like to experiment with the Digital488/80A unit and the example programs, do not install the HVCX1 option until after experimenting with the unit to avoid software/hardware configuration conflicts. If the HVCX1 option is already installed, replace it with the jumper board to run the example programs.

Never disassemble the Digital488/80A case while it is connected to the AC power line! Internal voltage potentials exist which could cause bodily injury or death!

The HVCX1 High Voltage/Current Interface option is a configurable daughter board that allows the Digital488/80A to be used with solenoids, switching relays and other high voltage / high current devices. When using the HVCX1 with an exte

rnal voltage source, the I/O lines may be configured as high voltage inputs (up to 50 V) or as high voltage / high current ou

tputs. The factory default is all 5 V I/O and handshaking f

or both channels with all ports

set as inputs. Inputs are configured on a port-by-port

basis (in groups of 8 bits). Inputs can be configured to be compatible with 5, 12, 24 and 48 volt logic. The interface voltage fo each port ma

y be set independently from

other ports.

CAUTION

WARNING

When the HVCX1 option is used, the data lines of both channels can be configured as high voltage / high current outputs. Outputs can support up to 50 VDC at 200 mA no

t to exceed 8 A total. When the outputs are configured as high voltage, using internal pull-up resistors (such as the 27K ohm SIP

), all 40 output lines on a channel have their pull-ups and integral flyback diodes pulled up to the flyback pin (Pin 48) on the DB-50 connector. When used in this mode, outputs are configured on a per-channel basis. T

his flyback pin should be connected to the positive supply lead of the power supply used with the external devices. The flyback diode suppl

ies protection against inductive

transients. Pin 48 sets the pull-up logic level for all output lines on a channel. Lines configured with the pull-up can

only be used as outputs. These outputs can sink up to 200 mA in the ON state and withstand voltages up to 50 VDC throu

gh the use of open collector drivers with integral flyback diodes for inductive load transient

suppression. For more information, see the "Specifications" section in Chapter 1: Digital488/80A Overview.

10 Digital488/80A Setup Digital488/80A User's Manual

Determining Ports Setup

Before configuring the HVCX1 option, determine which ports are going to be set up for inputs and which ports for outputs. Determine what voltages are desired for the inputs: 0-5 V, 0-12 V, 0-24 V or 0-48 V. The following chart shows which combinations of outputs and inputs are permitted (limitations set by the Configuration (

Configuration Command Port 5 Port 4 Port 3 Port 2 Port 1

C) software command).

C0 C1 C2 C3 C4 C5

Input Input Input Input Input Input Input Input Input Output Input Input Input Output Output Input Input Output Output Output Input Output Output Output Output

Output Output Output Output Output

Note: If no chips are installed in the input or output side of a port, the Digital488/80A lines are

pulled up and the user will receive "FF" from that port.

For convenience, you may want to program the Digital488/80A to power up with your configuration. Refer to the Configuration ( the Configuration (

C) command. To save the input/output status as the new setting for the power-up

default, it must be saved as part of the Recall Configuration ( configuration upon power on, the Save Configuration (

C) and Save Configuration (S) commands. Input or output status is set using

O) command. To set the unit to a particular

S) command must be used once all the desired

options have been selected.

Digital488/80A User’s Manual 11-08-02 Digital488/80A Setup 11

To Set Up Input Ports

Note: All of the components mentioned below are for the port section of the HVCX1 board

labelled INPUT.

1. Locate the two 5-port sections (one in the right half, one in the left half) of the HVCX1 board labelled INPUT.

2. Place the 2596 IC chip into the IC input socket of the port being configured. The notched end of the IC must be to the left (see above figure for the proper orientation).

3. Install the DIP (dual in-line) pack for the voltage desired. See the chart below for the DIP pack labeling. The notched end of the DIP pack must be to the left (see above figure for the proper orientation).

0-5 V 10 ohms 4116R-001-100 0-12 V 20K ohms 4116R-001-203 0-24 V 56K ohms 4116R-001-563 0-48 V 120K ohms 4116R-001-124

Inputs DIP Resistor Values Label of DIP Pack Supplied with HVCX1 Option

4. Verify that no components (the 2596 and SIP pack) are in the OUTPUT section of a port being configured as an input. Having components for the output and input installed in the same port will cause damage to the unit.

12 Digital488/80A Setup Digital488/80A User's Manual

To Set Up Handshaking Input Lines

Note: All of the components mentioned below are for the central section of the HVCX1 board

labelled EDR, SERVICE.

1. Locate the center of the HVCX1 board labelled CH0 EDR, SERVICE and CH1 EDR, SERVICE.

2. Install the DIP (dual in-line) pack for the input handshaking voltage desired. See the chart below for the DIP pack labeling. The notched end of the DIP pack must be to the left (see above figure for the proper orientation).

0-5 V 10 ohms 4116R-001-100 0-12 V 20K ohms 4116R-001-203 0-24 V 56K ohms 4116R-001-563 0-48 V 120K ohms 4116R-001-124

Inputs DIP Resistor Values Label of DIP Pack Supplied with HVCX1 Option

3. Verify that the appropriate DIP packs are installed in the CH0 EDR, SERVICE section fo r the Channel 0 settings, and in the CH1 EDR, SERVICE section for the Channel 1 settings.

Digital488/80A User’s Manual 11-08-02 Digital488/80A Setup 13

To Set Up Output Ports

Note: All of the components mentioned below are for the port section of the HVCX1 board

labelled OUTPUT.

1. Locate the two 5-port sections (one in the right end, one in the left end) of the HVCX1 board labelled OUTPUT.

2. Place the 2596 IC chip into the IC input socket of the port being configured. The notched end of the IC must be to the left (see above figure for the proper orientation).

3. When configuring the option for high voltage, install the 27K SIP (single in-line) pack pull-up resistor network (labeled 9X-1-273) in the SIP socket in the OUTPUT section. Make sure Pin 1 of the SIP pack, as denoted by the square dot, is toward the left (see above figure for the proper orientation). This pin must be connected to an external voltage supply in order to achieve the desired logic level.

4. Verify that no components (the 2596 and DIP pack) are in the INPUT section of a port being configured as an output. Having components for the output and input installed in the same port will cause damage to the unit.

To Set Up Handshaking Output Lines

With the HVCX1 option, the Digital488/80A handshaking outputs (Trigger, Inhibit, Strobe and Clear) can be set. The user-defined voltage is the voltage supplied through Pin 48 of the channel (voltage is the same as the data lines for ports configured as outputs). Handshaking output lines are changed as a group and cannot have their sense reconfigured; handshaking inputs are always inputs, and handshaking outputs are always outputs. There is one group of handshaking output lines per channel (i.e. CH0 has handshaking set and CH1 has handshaking set). Handshaking may be done at TTL levels even if digital I/O is set for a higher range.

14 Digital488/80A Setup Digital488/80A User's Manual

Note: All of the components mentioned below are for the upper-corner sections of the HVCX1

board labelled CONTROL.

1. Locate the upper corners of the HVCX1 board labelled CH1 CONTROL and CH0 CONTROL.

2. In these CH1 CONTROL and CH0 CONTROL sections, the handshaking outputs are set by jumpers JP1 and JP2, for either +5 VDC (TTL) or a user-defined voltage (see following figure for the proper jumper settings).

Digital488/80A User’s Manual 11-08-02 Digital488/80A Setup 15

To Install the HVCX1 Option

Note: If disassembly or disconnections are necessary, first turn off the power, next disconnect the AC

1. When the input and output port configurations on the HVCX1 option are complete, record the settings on the Digital488/80A HVCX1 Configuration Record supplied with your user's manual or provided in Appendix A of this manual.

2. Turn off the power. Next, disconnect the AC power line cord, and then all other test cables from the unit.

3. Place the unit on a flat surface. Remove the four screws on top of the case and remove the top cover.

4. Locate the two DIN-96 connectors on the HVCX1 board labelled J1 and J2, and the two DIN-96 connectors on the Digital488/80A main board labelled J4 and J1.

Note: If the HVCX1 option was not factory installed, the DIN-96 connectors have a jumper board

5. Hold the HVCX1 board upside down, with the label FRONT toward the front of the Digital488/80A and the label REAR toward the back of the Digital488/80A.

6. Line up the J1 DIN-96 on the HVCX1 board with the J4 DIN-96 on the Digital488/80A main board. Line up the J2 DIN-96 on the HVCX1 board with the J1 DIN-96 on the Digital488/80A main board.

When the HVCX1 option is used, the I/O lines are hardware configured as either inputs or outputs. The hardware and software configurations for the input and output ports must agree. The Digital488/80A unit is protected from configuration conflict, but the I/O lines will not respond properly.

power line, and then any other cables, prior to disassembly.

plugged into them. Remove the jumper board.

CAUTION

7. Press down the HVCX1 board gently but firmly to plug together the DIN-96 connectors. Be careful not to bend any DIN-96 connector pins.

8. Carefully reassemble the unit.

Note: For re-assembly, first reconnect the AC power line, and then any other cables, prior to reapplying

power to the entire system.

16 Digital488/80A Setup Digital488/80A User's Manual

Digital I/O Ports

CAUTION

The Digital488/80A has two DB-50 connectors -- Channel 0 and Channel 1 -- each of which provides 40 data lines programmable in groups of 8 bits as either input or output ports. The following figure illustrates one of the digital I/O DB-50 connectors as viewed from the rear panel of the Digital488/80A. Both Channel 0 and Channel 1 DB-50 connectors are identical.

DB-50 Con or nect

Pin Description Comment Pin Description Comment

1 Port 1 Bit 1 I/O, Port 1 LSB 26 Port 4 Bit 2 Input/Output 2 Port 1 Bit 2 Input/Output 27 Port 4 Bit 3 Input/Output 3 Port 1 Bit 3 Input/Output 28 Port 4 Bit 4 Input/Output 4 Port 1 Bit 4 Input/Output 29 Port 4 Bit 5 Input/Output 5 Port 1 Bit 5 Input/Output 30 Port 4 Bit 6 Input/Output 6 Port 1 Bit 6 Input/Output 31 Port 4 Bit 7 Input/Output 7 Port 1 Bit 7 Input/Output 32 Port 4 Bit 8 I/O, Port 4 MSB

8 Port 1 Bit 8 I/O, Port 1 MSB 33 Port 5 Bit 1 I/O, Port 5 LSB

9 Port 2 Bit 1 I/O, Port 2 LSB 34 Port 5 Bit 2 Input/Output 10 Port 2 Bit 2 Input/Output 35 Port 5 Bit 3 Input/Output 11 Port 2 Bit 3 Input/Output 36 Port 5 Bit 4 Input/Output 12 Port 2 Bit 4 Input/Output 37 Port 5 Bit 5 Input/Output 13 Port 2 Bit 5 Input/Output 38 Port 5 Bit 6 Input/Output 14 Port 2 Bit 6 Input/Output 39 Port 5 Bit 7 Input/Output 15 Port 2 Bit 7 Input/Output 40 Port 5 Bit 8 I/O, Port 5 MSB

16 Port 2 Bit 8 I/O, Port 2 MSB 41 Clear Output only 17 Port 3 Bit 1 I/O, Port 3 LSB 42 Data Strobe Output only

18 Port 3 Bit 2 Input/Output 43 Trigger Output only 19 Port 3 Bit 3 Input/Output 44 Inhibit Output only 20 Port 3 Bit 4 Input/Output 45 Service Input Input only 21 Port 3 Bit 5 Input/Output 46 External Data Ready Input only 22 Port 3 Bit 6 Input/Output 47 (Not Used) (Not Used) 23 Port 3 Bit 7 Input/Output 48 HVCX1 Flyback Flyback 24 Port 3 Bit 8 I/O, Port 3 MSB 49 +5 V 50 mA maximum load

25 Port 4 Bit 1 I/O, Port 4 LSB 50 I/O Common Ground

Digital488/80A User’s Manual 11-08-02 Digital488/80A Setup 17

Using the HVCX1 Option for High Voltage/Current Outputs

The HVCX1 option provides buffering for all the digital I/O lines on the Digital488/80A. This means that the HVCX1 option has 80 digital I/O lines that are divided into two 40-bit channels -- Channel 0 and Channel 1. Each channel is divided into five eight-bit ports. Six high-level ASCII commands configure the ports to be all inputs, all outputs or combinations in between. Thus, a configuration can range from 80 input lines to 80 output lines or combinations in between in multiples of 8 bits.

Once the Channel port(s) are configured for high level operation, they can be used to drive devices such as switching relays, solenoids and displays. For example, a typical application may require a lamp and a relay to be driven by the Digital488/80A. The relay is connected to data line 27 (Port 4) and the lamp is connected to data line 37 (Port 5). These two ports must be configured as high-level outputs. These devices would be connected as shown in the following figure.

Never connect external high-level devices to a Channel 0 port or to a Channel 1 port which has not first been configured for this purpose. Failure to do so may result in damage to the Digital488/80A.

CAUTION

Since a relay is used for this application, the flyback terminal is connected to the positive terminal of the external power supply. Note also that the Ground lead of the power supply should be connected to Pin 50 on the DB-50 connector. Remember that ports configured as high-level outputs can only be used as outputs.

18 Digital488/80A Setup Digital488/80A User's Manual

Digital488/80A Power & Assembly 3

Introduction…… 19

Internal Components…… 19 Factory Service…… 19

Power Line & Fuse Configuration…… 20

Line Voltage Selection…… 20

To Select the Line Voltage…… 21

Fuse Replacement…… 22

To Replace the Fuse…… 22

Rack-Mount & Bench-Top Assembly…… 23

Rack Mount…… 23 Bench Top…… 23

Power-Up & Programming Tests…… 24

Power-Up Activation…… 24 Programming Examples……25

KYBDCTRL.BAS Program…… 25 To Run the Keyboard Controller Program…… 25 Digital488/80A Command Responses…… 26

Introduction

Internal Components

The heart of the Digital488/80A is a 6809 microprocessor [U1] supported by 8K bytes of firmware EPROM [U2] and 32K bytes of battery-backed-up RAM [U3]. Interface to the IEEE 488 bus is accomplished by a 9914 interface chip [U13]. A 65B22 [U14] generates real-time interrupts for the firmware operating system and also drives the front panel LED indicators. The digital I/O ports are controlled through 6821 interface chips [U7, U8, U9, U10, U11, U16]. High-voltage, high-current output capability is provided on both channels if the HVCX1 option is used. Power is supplied by an on-board transformer and full-wave rectifier. Regulation to the required +5 volts is provided by an 78T05CT [U15].

The memory space allocation on the Digital488/80A is:

Factory Service

Chapter 7: Troubleshooting provides a troubleshooting reference for possible solutions to technical problems. Before calling for technical assistance, refer to this chapter.

However, if problems in using the Digital488/80A still persist, you should contact the factory. Many problems can be resolved by discussing the problems with the appropriate applications department. If the problem cannot be solved by this method, you will be instructed as to the proper return procedure.

Address Device Part Number Function

$0000-$7FFF U3 84256 32K x 8 RAM $8010-$8014 U7 68B21 Digital I/O $8020-$8024 U8 68B21 Digital I/O $8040-$8044 U9 68B21 Digital I/O $8080-$8084 U10 68B21 Digital I/O $8100-$8104 U11 68B21 Digital I/O $8200-$8204 U16 68B21 Digital I/O $8800-$8810 U14 65B22 Timer, Digital I/O $9000-$9907 U13 TMS9914A IEEE 488 Interface

$E000-$FFFF U2 2764 Programmed EPROM

Digital488/80A User’s Manual Digital488/80A Power & Assembly 19

Power Line & Fuse Configuration

The power configuration of the Digital488/80A unit consists of selecting the line voltage and replacing the fuses. Each Digital488/80A unit has a factory default to operate at 105-125 volts AC. However, each unit may be operated at either 105-125 or 210-250 VAC.

To change the operating voltage of the Digital488/80A unit, it is necessary to open the enclosure. However, before modifying the voltage, disconnect any input or output connections from the rear panel of the affected unit and then disconnect the power cord from the power line terminal.

Line voltage must be set for 105-125 or 210-250 VAC to match the power being supplied to the Digital488/80A unit. If the line voltage is changed text for the line

Line Voltage Selection

As already mentioned, the Digital488/80A may be operated with 105-125 or 210-250 VAC, 50-60 Hz power, as set by its internal line-voltage switch (labeled S4). Each unit is shipped from the factory with this operating voltage setting marked on its rear panel. If this is not the appropriate power setting to be supplied to the unit, then the line voltage and power fuse must be changed to avoid damage to the unit. The line-voltage selection procedure is outlined in the following steps.

WARNING

Do not use the Digital488/80A unit outdoors! The unit is intended for indoor use only! Outdoor conditions could result in equipment failure, bodily injury or death!

WARNING

Never disassemble the Digital488/80A case while it is connected to the AC power line! Internal voltage potentials exist which could cause bodily injury or death!

, the fuse must also be changed. Refer to the following

voltage switch and fuse locations.

CAUTION

Service: Fuse replacement and the changing of selected line voltage must be performed by qualified service personnel. Never open the Digital488/80A case while it is connecte or death!

d to the AC line. Contact with voltage potentials could cause bodily injury

20 Digital488/80A Power & Assembly Digital488/80A User's Manual

Note: If disassembly or disconnection is necessary, first turn off the power, next disconnect the AC

power line, and then any other cables, prior to disassembly.

To Select the Line Voltage

1. Turn off the power. Next, disconnect the AC power line cord, and then all other test cables from the

unit.

2. Place the unit on a flat surface. Remove the four screws on top of the case and remove the top cover.

3. Located next to the main power supply transformer is the line voltage selection switch (labeled S4).

Using a small screwdriver, insert the tip of the screwdriver into the slot of the switch and slide the switch to the left or right until it "clicks" into place with the desired line voltage selection visible.

CAUTION

It is possible to place the line voltage switch (S4

cause equipment damage or malfunction. Whe

V or 220 V selection. The switch will “click” into place when properly positioned.

voltage selection swi

tch (S4), make sure the switch is completely positioned to the 115

) in a partial position which could n changing the position of the line

4. Install a power line fuse appropriate for the line voltage. See section Fuse Replacement – Step 3,

following this section.

CAUTION

5. Make note of the new voltage setting for later reference.

6. Carefully reassemble the unit. Note: For re-assembly, first reconnect the AC power line, and then any other cables, prior to reapplying

power to the entire system.

Digital488/80A User’s Manual Digital488/80A Power & Assembly 21

Fuse Replacement

The Digital488/80A unit contains an internal AC line fuse. The fuse is located next to the internal linevoltage switch (S4). You may replace the fuse by using the procedures found in the following text.

Note: If disassembly or disconnection is necessary, first turn off the power, next disconnect the AC

To Replace the Fuse

1. Turn off the power. Next, disconnect the AC power line cord, and then all other cables from the unit.

2. Place the unit on a flat surface. Remove the four screws on top of the case and remove the top cover.

3. Located next to the line-voltage selection switch (labeled S4) is the power fuse. Gently pull upward

on the plastic fuse housing. The entire housing with the fuse inside should be removed.

4. Open the fuse housing by pushing up on the tab on the bottom of the housing. Remove the fuse, and

replace it with the proper type using the following list as a guide:

• For line voltage 105-125 V, use fuse type 1/2 A, Slo Blo, 3AG

• For line voltage 210-250 V, use fuse type 1/4 A, Slo Blo, 3AG

Service: Fuse replacement and the changing of selected line voltage must be performed by qualified service personnel. Never open the Digital488/80A case while it is connected to the AC line. Contact with voltage potentials could cause bodily injury or death!

power line, and then any other cables, prior to disassembly.

CAUTION

5. Close the housing. Insert the fuse into the fuse holder.

6. Make note of the new fuse rating for later reference. If you have also changed the operating line-

voltage selection, return to the previous section Line Voltage Selection – Step 5.

7. Carefully reassemble the unit.

Note: For re-assembly, first reconnect the AC power line, and then any other cables, prior to reapplying

power to the entire system.

CAUTION

22 Digital488/80A Power & Assembly Digital488/80A User's Manual

Rack-Mount & Bench-Top Assembly

The Digital488/80A includes accessories for rack-mount or bench-top assembly.

Rack Mount

If rack-mount assembly is required, remove the two plastic screws from the pre-drilled holes on each side of the unit. Since the unit can be mounted with the front or rear panel facing the front of the rack fixture, remove only those screws from the set of holes that will be toward the front of the rack. Attach the two rack ears using the enclosed screws.

Bench Top

If bench-top assembly is required, install the self-adhesive rubber feet on the bottom of the unit approximately one inch from each corner.

Digital488/80A User’s Manual Digital488/80A Power & Assembly 23

Power-Up & Programming Tests

Power-Up Activation

Condition

Normal (No Errors) ROM Error RAM Error NV-RAM Checksum Error No Power

With the power cord plugged in and connected to the Digital488/80A, turn on the unit by depressing the rear-panel power switch. All of the front-panel LED indicators should light up for approximately one second while the Digital488/80A performs an internal ROM and RAM self-check. At the end of this selfcheck all of the LED indicators should turn off except for POWER.

Otherwise, the Digital488/80A may be in an error condition according to the one of the four following LED patterns:

• If all of the LED indicators remain on: Then a ROM error has occurred.

• If the POWER LED indicator remains on while the rest of the LED indicators flash continuously:

Then a RAM error has occurred. Try cycling the power to the Digital488/80A to determine that the error is repeatable.

LED Patterns for Error Conditions

LED Indicators

TALK LISTEN SRQ ERROR TEST POWER

(Off) (Off) (Off) (Off) (Off) ON

ON ON ON ON ON ON

FLASHING FLASHING FLASHING FLASHING FLASHING ON

(Off) (Off) (Off) ON (Off) ON (Off) (Off) (Off) (Off) (Off) (Off)

CAUTION

• If the POWER and ERROR LED indicator remain on while the rest of the LED indicators are off:

Then a checksum error on Non-Volatile RAM occurred, and the saved configurations may be lost. The checksum error condition may be cleared by doing a save of a configuration using the Save Configuration (

S) command.

Note: The error condition cannot be cleared by using the Query Error Status (E?) command.

• If all of the LED indicators are off: Then there may not be any power being supplied to the

Digital488/80A. In this event, check to make sure that the AC power cable is securely connected at both ends. Otherwise, there may be a problem with the fuse. For more information, see section Power Line & Fuse Configuration earlier in this chapter.

For convenience, you may want to program the Digital488/80A to power up with your configuration. Refer to the Configuration ( the Configuration (

C) command. To save the input/output status as the new setting for the power-up

default, it must be saved as part of the Recall Configuration ( configuration upon power on, the Save Configuration (

C) and Save Configuration (S) commands. Input or output status is set using

O) command. To set the unit to a particular

S) command must be used once all the desired

options have been selected.

24 Digital488/80A Power & Assembly Digital488/80A User's Manual

+ 76 hidden pages

IOTech Digital488 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Introduction to this Manual

Table of Contents

Digital488/80A Overview 1

Introduction

Accessories

Specifications

Digital488/80A Setup 2

The Package

Hardware Setup

Digital488/80A Power & Assembly 3

Introduction

Power Line & Fuse Configuration

Rack-Mount & Bench-Top Assembly

Power-Up & Programming Tests