National Instruments GPIB-232CT-A Getting Started

GPIB

Getting Started with
Your GPIB-232CT-A and
the NI-488.2™ Software
for MacOS

GPIB-232CT-A for MacOS

December 1999 Edition

Part Number 320900C-01

Worldwide Technical Support and Product Information

www.ni.com

National Instruments Corporate Headquarters

11500 North Mopac Expressway Austin, Texas 78759-3504 USA Tel: [phone]

Worldwide Offices

Australia 03 9879 5166, Austria 0662 45 79 90 0, Belgium 02 757 00 20, Brazil 011 284 5011,
Canada (Calgary) 403 274 9391, Canada (Ontario) 905 785 0085, Canada (Québec) 514 694 8521,
China 0755 3904939, Denmark 45 76 26 00, Finland 09 725 725 11, France 01 48 14 24 24,
Germany 089 741 31 30, Greece 30 1 42 96 427, Hong Kong 2645 3186, India 91805275406,
Israel 03 6120092, Italy 02 413091, Japan 03 5472 2970, Korea 02 596 7456, Mexico (D.F.) 5 280 7625,
Mexico (Monterrey) 8 357 7695, Netherlands 0348 433466, Norway 32 27 73 00, Poland 48 22 528 94 06,
Portugal 351 1 726 9011, Singapore 2265886, Spain 91 640 0085, Sweden 08 587 895 00,
Switzerland 056 200 51 51, Taiwan 02 2377 1200, United Kingdom 01635 523545

For further support information, see the Technical Support Resources appendix. To comment on the
documentation, send e-mail to [e-mail]

© Copyright 1995, 1999 National Instruments Corporation. All rights reserved.

Important Information

Warranty

The GPIB-23 2 C T-A is warranted against defects in materials and wo rkma nshi p fo r a period of t wo years from the date of
shipment, as evidenced by receipts or other documentation. National Instruments will, at its option, repair or replace equipment
that proves to be defective during the warranty period. Th is warrant y in cludes parts and labor.

The media on which you receive National Instruments software are warranted not to fail to execute programming instructions, due
to defects in materials and workmanship, for a perio d of 9 0 da ys from d ate o f sh ip ment, as ev idenced b y receipt s o r ot her
documentation. National Instruments will, at its op ti on , repair or repl ace soft ware me dia th at do not ex ecu te pr ogram mi ng
instructions if National Instruments receives notice of such defects during the warranty period. National Instruments does not
warrant that the operation of the software shall be uni nterrup ted or error free.

A Return Material Authorization (RMA) number must be obtained from the factory and clearly marked on the outside of
the package before any equipment will be accepted for warranty work. National Instruments will pay the shipping costs of
returning to the owner parts which are covered by warrant y.

National Instruments believes that the information in this document is accurate. The document has been carefully reviewed
for technical accuracy. In the event that technical or typographical errors exist, National Instruments reserves the right to
make changes to subsequent editions of this document withou t p rio r no ti ce to hold ers o f thi s ed itio n. The read er sh ou ld consul t
National Instruments if errors are suspected. In no even t shall Nati on al Inst rum ents be l iable fo r any dama ges aris in g o ut of
or related to this document or the information contained in it.

XCEPT AS SPECIFIED HEREIN

E

WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
NEGLIGENCE ON THE PART OF NATIONAL INSTRUMENTS SHALL BE LIMITED TO THE AMOUNT THERETOFORE PAID BY THE CUSTOMER

NSTRUMENTS WILL NOT BE LIABLE FOR DAMAGES RESULTING FROM LOSS OF DATA, PROFITS, USE OF PRODUCTS, OR INCIDENTAL OR

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CONSEQUENTIAL DAMAGES, EVEN IF ADVISED OF THE POSSIBILITY THEREOF

apply regardless of the form of action, whether in contract or tort, including negligence. Any action against National Instruments
must be brought within one year after the cause of action accrues. National Instruments shall not be liable for any delay in
performance due to causes beyond its reasonable control. The warranty provided herein does not co ver d amag es, defects,
malfunctions, or service failures caused by ow ner’s fai lu re t o foll ow th e Nation al Inst rum ent s in stal l ation, op erat i on, or
maintenance instructions; owner’s modification of the pro du ct; ow ner’s abus e, m isus e, or negligent acts; and po wer failure or
surges, fire, flood, accident, actions of third parties, or otherevents outside reasonable control.

ATIONAL INSTRUMENTS MAKES NO WARRANTIES, EXPRESS OR IMPLIED, AND SPECIFICALLY DISCLAIMS ANY

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Copyright

Under the copyright laws, this publication may not be reproduced or transmitted in any form, electronic or mechanical, including
photocopying, recording, storing in an informatio n retriev al s ystem, o r t ran sl ating , in who le or i n p art, wit ho ut t he prior written
consent of National Instruments Corporation.

USTOMER’S RIGHT TO RECOVER DAMAGES CAUSED BY FAULT OR

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. This limitation of the liability of National Instruments will

. N

ATIONAL

Trademarks

NAT4882™, National Instruments™, ni.com™, NI-488™, NI-488.2™, TNT4882™C, and Turbo4 88™ are trademarks of
National Instruments Corporation.

Product and company names mentioned herein are trad emarks o r trad e name s of thei r respect ive compan ies .

WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS

(1) NATIONAL INSTRUMENTS PRODUCTS ARE NOT DESIGNED WITH COMPONENTS AND TESTING FOR A LEVEL
OF RELIABILITY SUITABLE FOR USE IN OR IN CONNECTION WITH SURGICAL IMPLANTS OR AS CRITICAL
COMPONENTS IN ANY LIFE SUPPORT SYSTEMS WHOSE FAILURE TO PERFORM CAN REASONABLY BE
EXPECTED TO CAUSE SIGNIFICANT INJURY TO A HUMAN.

(2) IN ANY APPLICATION, I NCLUDING THE ABOVE , RELIABILITY OF OP ERATION OF THE SOFT WARE PRODUCTS
CAN BE IMPAIRED BY ADVERSE FACTORS, INCLUDING BUT NOT LIMITED TO FLUCTUATIONS IN ELECTRICAL
POWER SUPPLY, COMPUTER HARDWARE MALFUNCTIONS, COMPUTER OPERATING SYSTEM SOFTWARE
FITNESS, FITNESS OF COMPILERS AND DEVELOPMENT SOFTWARE USED TO DE VEL OP AN APPLICAT ION,
INSTALLATION ERRORS, SOFTWARE AND HARDWARE COMPATIBILITY PROBLEMS, MALFUNCTIONS OR
FAILURES OF ELECTRONIC MONITORING OR CONTROL DEVICES, TRANSIENT FAILURES OF ELECTRONIC
SYSTEMS (HARDWARE AND/OR SOFTWARE), UNANTICIPATED USES OR MISUSES, OR ERRORS ON THE PART OF
THE USER OR APPLICATIONS DESIGNER (ADVERSE FACTORS SUCH AS THESE ARE HEREAFTER
COLLECTIVELY TERMED “SYSTEM FAILURES”). ANY APPLICATION WHERE A SYSTEM FAILURE WOULD
CREATE A RISK OF HARM TO PROPERTY OR PERSONS (INCLUDING THE RISK OF BODILY INJURY AND DEATH)
SHOULD NOT BE RELIANT SOLELY UPON ONE FORM OF ELECTRON IC SYSTE M DUE TO THE RISK OF SYSTEM
FAILURE. TO AVOID DAMAGE, INJURY, OR DEATH, THE USER OR APPLICATION DESIGNE R MU ST T AKE
REASONABLY PRUDENT STEPS TO PROTECT AGAINST SYSTEM FAILURES, INCLUDING BUT NOT LIMITED TO
BACK-UP OR SHUT DOWN MECHANISMS. BECAUSE EACH END-USER SYSTEM IS CUSTOMIZED AND DIFFERS
FROM NATIONAL INSTRUMENTS' TESTING PLATFORMS AND BECAUSE A USER OR APPLICATION DESIGNER
MAY USE NATIONAL INSTRUMENTS PRODUCTS IN COMBINATION WITH OTHER PRODUCTS IN A MANNER NOT
EVALUATED OR CONTEMPLATED BY NATIONAL INSTRUMENTS, THE USER OR A PPLICATION DE SIGNER IS
ULTIMATELY RESPONSIBLE FOR VERIFYING AND VALIDATING THE SUITAB ILITY OF NA TIONAL
INSTRUMENTS PRODUCTS WHENEVER NATIONAL INSTRUMENTS PRODUCTS ARE INCORPORATED IN A
SYSTEM OR APPLICATION, INCLUDING, WITHOUT LIMITATION, THE APPROPRIATE DESIGN, PROCESS AND
SAFETY LEVEL OF SUCH SYSTEM OR APPLICATION.

Compliance

FCC/Canada Radio Frequency Interference Compliance*

Determining FCC Class

The Federal Communications Commission (FCC) has rules to protect wireless communications from interference.
The FCC places digital electronics into two classes. These classes are known as Class A (for use in industrial­commercial locations only) or Class B (for use in residential or commercial locations). Depending on where it is
operated, this product could be subject to restrictions in the FCC rules. (In Canada, the Department of
Communications (DOC), of Industry Canada, regulates wireless interference in much the same way.)

Digital electronics emit weak signals during normal operation that can affect radio, television, or other wireless
products. By examining the product you purchased, you can determine the FCC Class and therefore which of the two
FCC/DOC Warnings apply in the following sections. (Some products may not be labelled at all for FCC, if so the
reader should then assume these are Class A devices.)

FCC Class A products only display a simple warning statement of one paragraph in length regarding interference and
undesired operation. Most of our products are FCC Class A. The FCC rules have restrictions regarding the locations
where FCC Class A products can be operated.

FCC Class B products display either a FCC ID code, starting with the letters EXN,
or the FCC Class B compliance mark that appears as shown here on the right.

The curious reader can consult the FCC web site
information.

FCC/DOC Warnings

This equipment generates and uses radio frequency energy and, if not installed and used in strict accordance with the
instructions in this manual and the CE Mark Declaration of Conformity**, may cause interference to radio and
television reception. Classification requirements are the same for the Federal Communications Commission (FCC)
and the Canadian Department of Communications (DOC).

Changes or modifications not expressly approved by National Instruments could void the user’s authority to operate
the equipment under the FCC Rules.

Class A

Federal Communications Commission

This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15
of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the
equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency
energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to
radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in
which case the user will be required to correct the interference at his own expense.

http://www.fcc.gov for more

Canadian Department of Communications

This Class A digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations.
Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le matériel brouilleur du

Canada.

Class B

Federal Communications Commission

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15
of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a
residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed
and used in accordance with the instructions, may cause harmful interference to radio communications. However,
there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful

interference to radio or television reception, which can be determined by turning the equipment off and on, the user
is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and receiver.

• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

• Consult the dealer or an experienced radio/TV technician for help.

Canadian Department of Communications

This Class B digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations.
Cet appareil numérique de la classe B respecte toutes les exigences du Règlement sur le matériel brouilleur du

Canada.

European Union - Compliance to EEC Directives

Readers in the EU/EEC/EEA must refer to the Manufacturer's Declaration of Conformity (DoC) for information**
pertaining to the CE Mark compliance scheme. The Manufacturer includes a DoC for most every hardware product
except for those bought for OEMs, if also available from an original manufacturer that also markets in the EU, or
where compliance is not required as for electrically benign apparatus or cables.

* Certain exemptions may apply in the USA, see FCC Rules §15.103 Exempted devices, and §15.105(c). Also

available in sections of CFR 47.

** The CE Mark Declaration of Conformity will contain important supplementary information and instructions for

the user or installer.

Contents

About This Manual

Conventions ...................................................................................................................xi

Related Documentation........................................... .......................................................xii

Chapter 1
Introduction

What You Need to Get Started......................................................................................1-1

Optional Equipment............................................. ..........................................................1-2

GPIB-232CT-A Hardware Overview............................................................................1-2

NI-488.2 Software Overview........................................................ .................................1-3

Time-Saving Development Tools..................................................................................1-4

Chapter 2
Configure and Install Your Hardware

Configure Your Hardware (Optional)............................................................................ 2-1

Install Your Hardware ...................................................................................................2-3

Step 1. Verify the Voltage Requirement .........................................................2-3

Step 2. Shut Down Your System .....................................................................2-3

Step 3. Connect the Cables..............................................................................2-4

Step 4. Power on Your System and Switch on Your GPIB-232CT-A............2-4

Chapter 3
Install and Configure the Software

Install the Software........................................................................................................3-1

Step 1. Install the NI-488.2 Files and Folders.................................................3-1

Step 2. Examine or Change the Software Settings..........................................3-3

Step 3. Restart Your Macintosh.......................................................................3-4

Verify the Software Installation....................................................... ..............................3-4

Chapter 4
Troubleshooting

Troubleshooting Hardware Problems............................................................................4-1

Troubleshooting Software Problems .............................................................................4-2

Common Questions........................................................................................................4-2

© National Instruments Corporation vii GPIB-232CT-A for MacOS

Contents

Chapter 5
Begin to Use the NI-488.2 Software

Introduction to IBIC 488.2............................................................................................5-1

General Programming Considerations ..........................................................................5-1

Appendix A
Specifications

Appendix B
Interfacing to a Serial Device

Appendix C
Technical Support Resources

Glossary

Figures

Figure 1-1. GPIB-232CT-A............................... .................................. ....................1-3

Figure 2-1. Factory Default Setting (S Mode) for DIP Switch................................2-1

Figure 3-1. Installer Window...................................................................................3-2

Figure 3-2. File and Folder Organization after Installation.....................................3-3

Figure 3-3. NI-488 Config Control Panel . ...............................................................3-4

Figure B-1. Location of the RS-232 Connector ....................................................... B-2

Figure B-2. Cable Configuration for 9-pin DTE to 9-pin DCE with

Handshaking ..................................................................... ....................B-3

Figure B-3. Cable Configuration for 9-pin DTE to 25-pin DCE with

Handshaking .........................................................................................B-4

Figure B-4. Minimum Configuration for 9-pin DTE to 9-pin DCE.........................B-5

Figure B-5. Minimum Configuration for 9-pin DTE to 25-pin DCE.......................B-5

Figure B-6. Cable Configuration for 9-pin DTE to 9-pin DTE with

Handshaking .........................................................................................B-6

Figure B-7. Cable Configuration for 9-pin DTE to 25-pin DTE with

Handshaking .........................................................................................B-7

Figure B-8. Minimum Configuration for 9-pin DTE to 9-pin DTE.........................B-8

Figure B-9. Minimum Configuration for 9-pin DTE to 25-pin DTE.......................B-8

Figure B-10. Cable Configuration for 9-pin DTE to 8-pin Mini-DIN....................... B-9

GPIB-232CT-A for MacOS viii www.ni.com

Tables

Contents

Table 2-1. Configuration Parameters for Switches 1 through 3.............................2-2

Table 2-2. Configuration Parameters for Switches 4 through 8.............................2-3

Table B-1. Cable Wiring Scheme for GPIB-232CT-A DTE

to Serial Device DCE............................................................................B-2

Table B-2. Cable Wiring Scheme for GPIB-232CT-A DTE

to Serial Device DTE ............................................................................B-6

Table B-3. Cable Wiring Scheme for GPIB-232CT-A DTE

to Macintosh Serial Port........................................................................B-9

© National Instruments Corporation ix GPIB-232CT-A for MacOS

About This Manual

This manual contains instructions to help you install and configure the
National Instruments GPIB-232CT-A RS-232-to-GPIB Controller and
NI-488.2 software for MacOS. You should use this manual with the

NI-488.2 User Manual for MacOS and NI-488.2 Function Reference
Manual for MacOS.

This manual assumes that you are already familiar with MacOS.

Conventions

The following conventions appear in this manual:
This icon denotes a note, which alerts you to important information.
This icon denotes a caution, which advises you of precautions to take to

avoid injury, data loss, or a system crash.
This icon denotes a warning, which advises you of precautions to take to

avoid being electrically shocked.

bold Bold text denotes items that you must select or click on in the software,

such as menu items and dialog box options. Bold text also denotes
parameter names.

IEEE 488 and IEEE 488 and IEEE 488.2 refer to the ANSI/IEEE Standard 488.1-1987
IEEE 488.2 and ANSI/IEEE Standard 488.2-1992, respectively, which define the

GPIB.

italic Italic text denotes variables, emphasis, a cross reference, or an introduction

to a key concept. This font also denotes text that is a placeholder for a word
or value that you must supply.

Macintosh Macintosh refers any computer using MacOS.

monospace Text in this font denotes text or characters that you should enter from the

keyboard, sections of code, programming examples, and syntax examples.
This font is also used for the proper names of disk drives, paths, directories,
programs, subprograms, subroutines, device names, functions, operations,
variables, filenames and extensions, and code excerpts.

RS-232 RS-232 refers to the ANSI/EIA-232-C standard.

© National Instruments Corporation xi GPIB-232CT-A for MacOS

About This Manual

Related Documentation

The following documents contain information that you might find helpful
as you read this manual:

• ANSI/EIA-232-C, Interface Between Data Terminal Equipment and

Data Circuit-Terminating Equipment Employing Serial Binary Data
Interchange

• ANSI/IEEE Standard 488.1-1987, IEEE Standard Digital Interface
for Programmable Instrumentation

• ANSI/IEEE Standard 488.2-1992, IEEE Standard Codes, Formats,
Protocols, and Common Commands

GPIB-232CT-A for MacOS xii www.ni.com

Introduction

This chapter lists what you need to get started and optional equipment you
can order, and briefly describes the GPIB-232CT-A and the NI-488.2
software.

What You Need to Get Started

Before you install your GPIB hardware and the NI-488.2 software for
MacOS, make sure you have all of the following items:

❑ 3.5 in. high density (1.44 MB) NI-488.2 Software for MacOS

Distribution Disk, which is included in your kit

❑ One of the following controllers, which is included in your kit:

– GPIB-232CT-A, 100–120 VAC
– GPIB-232CT-A, 220–240 VAC
– GPIB-232CT-A, DC

1

❑ If you have an A C v ersion, one of the follo wing power cords, which is

included in your kit:
– U.S.A. standard power cord
– Swiss power cord
– Australian power cord
– Universal European power cord
– North American power cord
– U.K. power cord

❑ If you have a DC version, one of the following DC power supplies,

which is included in your kit:
– Wall-mount power supply (100–120 VAC, 9 V, 1 A)
– Desktop power supply (220–240 VAC, 9 V, 1 A)

© National Instruments Corporation 1-1 GPIB-232CT-A for MacOS

Chapter 1 Introduction

❑ One of the following shielded GPIB cables, which you can purchase

from National Instruments:
– Type X1 single-shielded cables (1, 2, or 4 m)
– Type X2 double-shielded cables (1, 2, or 4 m)

Caution To meet FCC emission limits for this device, you must use a shielded (Type X1

or X2) GPIB cable. If you operate this equipment with a non-shielded cable, it may
interfere with radio and television reception.

Optional Equipment

You can call National Instruments to order RS-232 shielded cables for the
GPIB-232CT-A (9-pin D-Sub) to Macintosh (8-pin Mini-DIN), 1 m .

GPIB-232CT-A Hardware Overview

The GPIB-232CT-A, shown in Figure 1-1, is a high-performance
serial-to-GPIB interface. It provides a computer with an RS-232 port,
a means of controlling, talking, and listening on the GPIB. The
GPIB-232CT-A is also capable of interfacing RS-232 instruments and
peripherals to the GPIB.

The GPIB-232CT-A has all the software and logic required to implement
the physical and electrical specifications of the IEEE 488 and RS-232
standards. It can interpret and execute high-level commands that you send
to it over the serial port, and perform GPIB-to-RS-232 protocol con version.
The GPIB-232CT-A also conforms to all versions of the IEEE 488
standard, including IEEE 488.2. The NA T4882 Controller chip implements
all IEEE 488 Talker/Listener/Controller functionality.

GPIB-232CT-A for MacOS 1-2 www.ni.com

Chapter 1 Introduction

DC Power Jack

(DC version only)

RS-232 Connector

GPIB-232CT-A

IEEE 488 ControllerRS-232

NI-488.2 Software Overview

The NI-488.2 software for MacOS is a comprehensive set of programs and
drivers for transforming the Macintosh into a GPIB Controller with
complete communications and bus management capability. The NI-488.2
software also includes an interactive debugger; FutureBASIC, Macintosh
Programmer’s Workshop (MPW) C, THINK C, and Metrowerks
CodeWarrior C language interfaces; and a shared library for C
programmers developing applications for PowerPC.

The NI-488.2 software includes the following components:

• NI-488.2 Installer is the software installation program.

• NI-488 INIT is an INIT that loads the device drivers for installed

National Instruments GPIB interfaces when you power on or restart
your Macintosh.

• NI-488 Config is a control panel conf iguration utility that you can use

to examine or change the software settings.

• The C LI and BASIC LI folders contain language interfaces for

Macintosh Programmer's Workshop (MPW) C, THINK C,
Metrowerks CodeWarrior C, FutureBASIC, and a shared library for
C programmers developing applications for the PowerPC platform.

• IBIC 488.2 is an interactive GPIB control utility.

• NI-488.2 Test is a software diagnostic utility.

• The Ethernet folder contains utilities that are applicable only if you

have a National Instruments GPIB-ENET.

• The Read Me file contains the latest updates and corrections to the

manual when appropriate.

TALK

LISTEN

SRQ

POWER

READY

Figure 1-1. GPIB-232CT-A

ATN

GPIB Connector

© National Instruments Corporation 1-3 GPIB-232CT-A for MacOS

Chapter 1 Introduction

Time-Saving Development Tools

Your kit includes the NI-488.2 software for MacOS. In addition, you
can order the LabVIEW software from National Instruments to speed your
application development time and make it easier to communicate with your
instruments.

LabVIEW is an easy-to-use, graphical programming environment you
can use to acquire data from thousands of different instruments, including
IEEE 488.2 devices, VXI devices, serial devices, PLCs, and plug-in data
acquisition boards. After you have acquired raw data, you can convert it
into meaningful results using the powerful data analysis routines in
LabVIEW. LabVIEW also comes with hundreds of instrument drivers,
which dramatically reduce software dev elopment time, because you do not
have to spend time programming the low-level control of each instrument.
Your kit includes the NI-488.2 software for MacOS. In addition, you can
order the LabVIEW software from National Instruments. LabVIEW
includes instrument driver libraries that make it easier to communicate with
your GPIB instruments.

For ordering information, or to request free demonstration software,
contact National Instruments.

GPIB-232CT-A for MacOS 1-4 www.ni.com

Configure and Install
Your Hardware

This chapter contains instructions for configuring your GPIB-232CT-A
and connecting it to your computer.

Configure Your Hardware (Optional)

The default hardware settings for the GPIB-232CT-A are compatible with
the default software settings. If you change the hardware settings, make
sure that you also change the software settings so that they are compatible.

The GPIB-232CT-A is shipped from the factory configured to operate in
Serial (S) mode. In S mode, the computer attached to the RS-232 port of the
GPIB-232CT-A is the controlling device. The RS-232 serial port is
configured at 9600 baud, 1 stop bit, no parity , and 8 data bits. To change the
parameters, set the configuration switches on the back panel.

The DIP switch is used to configure the serial port parameters of the
GPIB-232CT-A while in S mode. In G mode, the GPIB-232CT-A is used
to interface an RS-232 device as a GPIB Talker/Listener.

2

Figure 2-1 shows the factory default setting of the DIP switch. Notice that
Figure 2-1 shows the DC version of the GPIB-232CT-A. The AC version
does not have a power switch shown on the right.

S MODE

DATA FORMAT

BAUD RATE

GPIB ADDRESS

G MODE

Figure 2-1.

© National Instruments Corporation 2-1 GPIB-232CT-A for MacOS

ON

ON OFF

OFF

Factory Default Setting (S Mode) for DIP Switch

Chapter 2 Configure and Install Your Hardware

Note For the purpose of this explanation, the switches have been assigned numbers as a

point of reference. These numbers do not appear on the GPIB-232CT-A itself. In this
explanation, the three switches labeled BAUD RATE are switches 1 through 3, the D ATA
FORMAT switches are switches 4 through 7, and the S MODE switch is switch 8.

In Figure 2-1, switches 1 through 3 are ON, OFF, and ON, respectively,
indicating that the serial port is operating at 9600 baud. Switches 4 and 5
are both OFF, which indicates that parity is disabled. Switch 6 is OFF,
indicating 1 stop bit/character. Switch 7 is ON, indicating that the
GPIB-232CT-A is using 8 bits per character for serial data transfers.
Switch 8 is OFF, indicating that the GPIB-232CT-A is operating in S mode.

Tables 2-1 and 2-2 show the possible configurations of the eight switches
and what each configuration indicates. The factory default settings are in
bold italics.

Table 2-1. Configuration Parameters for Switches 1 through 3

Switches

1 2 3 Indication

OFF OFF OFF 300 baud

ON OFF OFF 600 baud

OFF ON OFF 1200 baud

ON ON OFF 2400 baud

OFF OFF ON 4800 baud

ON OFF ON 9600 baud

OFF ON ON 19200 baud

ON ON ON 38400 baud

GPIB-232CT-A for MacOS 2-2 www.ni.com

Chapter 2 Configure and Install Your Hardware

Table 2-2.

Switch Position Indication

4 OFF Odd parity

ON Even parity

5 OFF Parity generation/checking disabled

ON Parity generation/checking enabled

6 OFF 1 stop bit/character

ON 2 stop bits/character

7 OFF 7 bits/character

ON 8 bits/character

8 OFF Operates in S mode

ON Operates in G mode

Install Your Hardware

Complete the following steps to connect your GPIB-232CT-A to your
computer.

Configuration Parameters for Switches 4 through 8

Step 1. Verify the Voltage Requirement

Verify that the voltage marked on your GPIB-232CT-A or on the power
supply matches the voltage that is supplied in your area.

Caution

your GPIB-232CT-A. Doing so could damage the unit. Replacement fuses for the AC
version must be the proper type and size. For fuse specifications, refer to Appendix A,

Specifications.

Do not operate your GPIB-232CT-A at any voltage other than the one marked on

Step 2. Shut Down Your System

Before you connect the cables, complete the following steps:

1. Shut down your system.

2. Turn off your computer and unplug the power cord.

© National Instruments Corporation 2-3 GPIB-232CT-A for MacOS

Chapter 2 Configure and Install Your Hardware

Step 3. Connect the Cables

To connect the cables, complete the following steps:

1. Connect the serial cable to the GPIB-232CT -A 9-pin D-Sub connector
and securely fasten the holding screws. Connect the other end of the
cable to your Macintosh. Be sure to use only shielded serial cables, and
follow all RS-232 cabling restrictions.

2. Connect the GPIB cable to the GPIB-232CT-A 24-pin Champ
connector and tighten the thumb screws on the connector . Connect the
other end to your GPIB device(s). Be sure to follow all IEEE 488
cabling restrictions, and use only shielded GPIB cables.

3. If you have an AC version, connect the power cord to the power
receptacle on the front panel of the GPIB-232CT- A, then plug the
supply into an AC outlet of the correct voltage.

If you have a DC version, connect the DC po wer plug of the DC power
supply to the power jack on the serial end of the GPIB-232CT -A, then
plug the supply into an AC outlet of the correct voltage.

Step 4. Power on Your System and Switch on Your GPIB-232CT-A

To power on your system, complete the following steps:

1. Plug the power cords for your computer system into a power outlet and
power on all devices.

2. If you have an AC version, use the front panel rocker switch to power
on your GPIB-232CT-A. If you have a DC version, use the power
switch on the rear panel to power on your GPIB-232CT-A.

The POWER LED indicator should come on immediately. The READY
LED indicator should come on after the GPIB-232CT-A has passed its
power-on self test, indicating the unit is ready for operation. If the READY
LED does not come on within seven seconds after the unit is powered on,
recheck all connections and switch settings and retry the power-on
sequence. If the READY LED still does not come on, refer to Chapter 4,

Troubleshooting, for information on areas to check if you have problems

installing the GPIB-232CT-A.

GPIB-232CT-A for MacOS 2-4 www.ni.com

Install and Configure
the Software

This chapter contains instructions for installing and configuring the
NI-488.2 software and describes how to verify the installation.

Install the Software

The NI-488.2 software is in compressed form on one disk. Installing all of
the software requires about 1.5 MB of space on your hard disk and takes
about five minutes.

Install the NI-488.2 software by completing the following steps.

Step 1. Install the NI-488.2 Files and Folders

3

Caution

to the System Folder. You must disable or bypass any virus prevention software before
attempting the installation procedure.

© National Instruments Corporation 3-1 GPIB-232CT-A for MacOS

Virus detection software might prevent the installer from copying important f iles

To install the NI-488.2 files and folders, complete the following steps:

1. Insert the NI-488.2 software distribution disk and double-click on the

NI-488.2 Installer icon.

Chapter 3 Install and Configure the Software

2. Click on the icon on the left side of the Installer window, sho wn in
Figure 3-1, and drag it to any available disk on the right side of the
window.

Figure 3-1. Installer Window

After installation of all of the software, the NI-488.2 folder should contain
the items shown in Figure 3-2. The NI-488 Config file is placed in the
Control Panels folder and the NI-488 INIT and NI-DMA/DSP files are
installed in the Extensions folder.

Figure 3-2. File and Folder Organization after Installation

GPIB-232CT-A for MacOS 3-2 www.ni.com

Chapter 3 Install and Configure the Software

Step 2. Examine or Change the Software Settings

You might want to configure the NI-488.2 software using the configuration
utility. The default settings for the software work for most applications and
devices. However, you might want to change a device name or primary
address. Also, if more than one GPIB interface or external box is installed,
you might want to associate a device with a particular interface.

Y ou can acti vate the configuration utility by selecting Control Panels from
the Apple Icon menu and selecting NI-488 Config.

After the configuration utility is activated, click on the Interface Type
menu and select Serial box products as shown in Figure 3-3. Check either
the modem box (M) or the printer box (P), depending on which Macintosh
serial port you have connected to the GPIB-232CT-A. The GPIB bus
number associated with the serial port appears under the checkbox.

Figure 3-3.

© National Instruments Corporation 3-3 GPIB-232CT-A for MacOS

NI-488 Config Control Panel

Chapter 3 Install and Configure the Software

Step 3. Restart Your Macintosh

The NI-488.2 driver is installed every time you start or restart your
Macintosh. The NI-488.2 software displays the National Instruments icon
momentarily in the lower left corner of the screen to indicate that the driver
is being installed. If the National Instruments icon does not appear on your
screen, repeat the installation procedure before continuing to the next
section, Verify the Software Installation.

Verify the Software Installation

This step verifies that the software is installed and functioning with
the GPIB-232CT-A. First, disconnect all GPIB cables from the
GPIB-232CT-A, then double-click on the NI-488.2 Test icon in the
NI-488.2 folder.

If no error messages appear on the screen, the installation is complete.
If error messages do appear on the screen, select Restart from the Special
menu, and double-click on the NI-488.2 Test icon. If the test fails again,
reinstall the NI-488.2 software from the distribution disk, restart your
Macintosh, and double-click on the NI-488.2 Test icon.

If any one of the software installation steps fails, review the material in
Chapter 4, Troubleshooting, which describes ho w to troubleshoot problems
and lists some common questions. If you need to change a software setting,
refer to Chapter 6, GPIB Configuration Utility, in the NI-488.2 User
Manual for MacOS. If the software settings are correct and the verification
still fails, carefully note all error information and contact National
Instruments.

If the verification test is successful, you are ready to write your own
application. Refer to the NI-488.2 Function Reference Manual for MacOS
for sample applications.

GPIB-232CT-A for MacOS 3-4 www.ni.com

Troubleshooting

This chapter describes how to troubleshoot hardware and software
problems and lists some common questions.

If you still have problems after completing the steps in this chapter, refer to
Appendix C, Technical Support Resources.

Troubleshooting Hardware Problems

4

Warning

hazardous voltages. Do
Be sure to remove the power cord before opening the unit.

Warning

and rating of fuse. See Appendix A, Speci fications, for fuse specifications.

The AC version of the GPIB-232CT-A contains circuitry that operates with

open the unit unless so instructed by National Instruments.

NOT

Check the following if you encounter hardware problems:

• Verify that all cables are securely connected to the GPIB-232CT-A.

• Check the DIP switch settings on the GPIB-232CT-A. The DIP switch
selects the serial port configuration. Most applications require the
default setting, which is shown in Figure 2-1. Refer to the Configure

Your Hardware (Optional) section of Chapter 2, Configure and Install
Your Hardware, for information on setting the GPIB-232CT-A

configuration using this switch.

• Verify that the GPIB-232CT-A is powered on.

• If you have an AC version, check the fuse.

For continued protection against fire, replace the fuse only with the same type

© National Instruments Corporation 4-1 GPIB-232CT-A for MacOS

Chapter 4 Troubleshooting

Troubleshooting Software Problems

The NI-488 Config control panel (GPIB configuration utility) should show
the following software configuration:

• Interface Type box should be set to Serial box products.

•An

You can use the NI-488 Config control panel utility to examine and adjust
the configuration of the software. Refer to Chapter 6, GPIB Configuration
Utility, in the NI-488.2 User Manual for MacOS for more information on
running the utility and for information about the configurable software
parameters.

If the software verification test fails, make sure that no GPIB cables are
connected to the GPIB-232CT-A.

X should appear in either the box labeled M, if you connected the

GPIB-232CT-A to the Macintosh modem port, or the box labeled P,
if you connected it to the Macintosh printer port.

Common Questions

When should I use IBIC 488.2?

Y ou can use
troubleshoot problems, and develop your application program. For more
information about
Interactive Control Utility, in the NI-488.2 User Manual for MacOS.

How do I use an NI-488.2 language interface?

For information about using NI-488.2 language interfaces, refer to the
NI-488.2 User Manual for MacOS.

What do I do if the software verification test fails with an error?

Refer to the Troubleshooting Software Problems section of this chapter for
information about what might cause this test to fail.

What do I do if I have installed the NI-488.2 software and now my
Macintosh crashes upon startup?

Try changing the name of the NI-488 INIT to ZNI-488 INIT. Because
INITs load in alphabetical order, the ZNI-488 INIT will load last,
preventing possible corruption from INITs that load after it. If changing the
name of the NI-488 INIT does not solve the problem, another INIT file

IBIC 488.2 to practice communication with your instrument,

IBIC 488.2, refer to Chapter 4, Interface Bus

GPIB-232CT-A for MacOS 4-2 www.ni.com

Chapter 4 Troubleshooting

might have a conflict with the NI-488 INIT. Try removing some of your
other INIT files. You can store them in a temporary folder, in case you need
to reload them later. If you are using System 7.5 or later, you can use the
Extensions Manager control panel to disable certain extensions and
control panels.

My system has been crashing since I switched to a Quadra computer.
What should I do?

This problem was associated with some versions of the NB Handler INIT .
Upgrade to the

NI-488 INIT to resolve this situation.

What information should I have before I call National Instruments?

Before you call National Instruments, you should have the results of the
software verification test.

© National Instruments Corporation 4-3 GPIB-232CT-A for MacOS

Begin to Use the
NI-488.2 Software

This chapter describes the IBIC 488.2 utility and lists some general
programming considerations.

Introduction to IBIC 488.2

The NI-488.2 software includes the Interface Bus Interactive Control
utility,

IBIC 488.2. You can use IBIC 488.2 to enter NI-488 functions

and NI-488.2 routines interactively and display the results of the function
calls automatically. Without writing an application, you can use

488.2

to do the following:

• Verify GPIB communication with your device quickly and easily.

• Become familiar with the commands of your device.

• Receive data from your GPIB devic e.

• Learn new functions and routines before integrating them into your
application.

• Troubleshoot problems with your application.

5

IBIC

For more information about
Manual for MacOS.

IBIC 488.2, refer to the NI-488.2 User

General Programming Considerations

Depending on the programming language you use to develop your
application, you must include certain files, statements, or global variables
at the beginning of your application. For specific instructions, refer to the
NI-488.2 User Manual for MacOS.

For information about choosing a programming method, developing your
application, or compiling and linking, refer to the NI-488.2 User Manual
for MacOS. For detailed information about each NI-488 function and
NI-488.2 routine, refer to the NI-488.2 Function Reference Manual for
MacOS.

© National Instruments Corporation 5-1 GPIB-232CT-A for MacOS

Specifications

This appendix lists the electrical, environmental, and physical
characteristics of the GPIB-232CT-A and the recommended operating
conditions.

Electrical Characteristics

AC Version

Power supply unit

100–120 VAC ±10% ...................... 50–60 Hz

220–240 VAC ±10% ...................... 50–60 Hz

Current requirement

100–120 VAC.................................55 mA

220–240 VAC.................................45 mA

Fuse rating and type

100–120 VAC.................................300 mA, UL/CSA approved

220–240 VAC.................................500 mA, IEC approved

A

DC Version

Power supply unit (50–60 Hz input, 9 VDC at 1 A output)

Wall-mount type ............................. 10 0–12 0 VAC ± 10%

Desktop type ................................... 220–24 0 VAC ± 10%

DC input.................................................+5 to +13, regulated

Current ...................................................700 mA minimum

© National Instruments Corporation A-1 GPIB-232CT-A for MacOS

Appendix A Specifications

Environmental Characteristics

AC Version

Operating temperature............................10 to 40 °C

Storage temperature................................0 to 70 °C

Relative humidity ...................................10% to 95%, noncondensing

EMI.........................................................FCC Class A Verified

DC Version

Operating temperature............................10 to 40 °C

Storage temperature................................0 to 70 °C

Relative humidity ...................................10% to 95%, noncondensing

EMI.........................................................FCC Class B Certified

Physical Characteristics

AC Version

Case size .................................................118.1 by 76.2 by 44.2 mm

(4.65 by 3.0 by 1.74 in.)

Case material ..........................................All metal enclosure

Weight ....................................................340 g (12 oz)

DC Version

Case size .................................................118.1 by 76.2 by 28.2 mm

(4.65 by 3.0 by 1.11 in.)

Case material ..........................................All metal enclosure

Weight ....................................................198 g (7 oz)

GPIB-232CT-A for MacOS A-2 www.ni.com

Interfacing to a Serial Device

This appendix describes the RS-232 serial port on the GPIB-232CT-A
and explains how to interface a DCE or DTE serial device to the RS-232
serial port.

The GPIB-232CT-A transfers serial data using the electrical signals,
mechanical connections, data format, and control protocols defined in the
RS-232C standard. The RS-232 port on the GPIB-232CT-A provides an
asynchronous serial communication link to a serial peripheral device.

RS-232C Standard

The RS-232C standard (international standard CCITT V.24) was
formulated in 1969 largely from the efforts of the Electronic Industries
Association (EIA) and Bell Laboratories. The standard describes the
electrical specifications and arrangement of control and data signals
on both sides of a serial communications interface. Its original intent was
to interface terminals to modems. Many manufacturers of computers and
instruments have adopted the standard for their serial communications
needs. For more information on the RS-232C standard, contact:

Global Engineering Documents
2805 McGaw Avenue
Irvine, CA 92714
[phone]

B

Description of the RS-232 Port

The RS-232 serial port on the GPIB-232CT-A uses a male 9-pin D-Sub
connector with a DTE interface configuration. Table B-1 shows the signal
lines supported on the GPIB-232CT-A.

© National Instruments Corporation B-1 GPIB-232CT-A for MacOS

Appendix B Interfacing to a Serial Device

Interfacing Serial Devices to the RS-232 Serial Port

To interface other serial devices to the RS-232 serial port on the
GPIB-232CT-A, first refer to the manual that came with your serial device
to determine if the device is conf igured as a DTE or DCE. Also, determine
from the manual how the control lines are used and whether they must be
driven for the serial port to operate.

Note

The GPIB-232CT-A serial port is configured to be a DTE.

Figure B-1 shows the location of the RS-232 connector.

DC Power Jack

(DC version only)

RS-232 Connector

GPIB-232CT-A

IEEE 488 ControllerRS-232

Figure B-1.

TALK

LISTEN

POWER

READY

Location of the RS-232 Connector

SRQ

Interfacing to a DCE with Handshaking

A correctly configured DTE-to-DCE interface is wired straight across:
GPIB-232CT-A TXD to DCE TXD, GPIB-232CT-A RXD to DCE RXD,
and so on as shown in Table B-1.

Table B-1.

GPIB-232CT-A Signal to

DCE Serial Device Signal

RXD to RXD
TXD to TXD

Cable Wiring Scheme for GPIB-232CT-A DTE

to Serial Device DCE

Standard
DTE to DCE
9-pin 9-pin

1

1

2 to 2 2 to 3
3 to 3 3 to 2

GPIB Connector

ATN

Standard

DTE to DCE

9-pin 25-pin

DTR to DTR 4 to 4 4 to 20

GPIB-232CT-A for MacOS B-2 www.ni.com

Appendix B Interfacing to a Serial Device

Table B-1. Cable Wiring Scheme for GPIB-232CT-A DTE

to Serial Device DCE (Continued)

GPIB-232CT-A Signal to

DCE Serial Device Signal

GND to GND

1

Standard
DTE to DCE
9-pin 9-pin

5 to 5 5 to 7

Standard

DTE to DCE

9-pin 25-pin

RTS to RTS 7 to 7 7 to 4
CTS to CTS 8 to 8 8 to 5

1

The connections must be implemented.

Figure B-2 shows a properly configured 9-pin DTE to 9-pin DCE cable
including the hardware handshake lines RTS, CTS, and DTR. With this
configuration, the GPIB-232CT-A can function properly (handshake) on
buffer full conditions. Figure B-3 shows an equivalent 9-pin DTE to 25-pin
DCE cable configuration.

6
7
8
9

GPIB-232CT-A

9-Pin DTE

1

5

5

9
8
7
6

1

Serial Device

9-Pin DCE

Figure B-2. Cable Configuration for 9-pin DTE to 9-pin DCE with Handshaking

© National Instruments Corporation B-3 GPIB-232CT-A for MacOS

Appendix B Interfacing to a Serial Device

1
6
7
8
9

5

GPIB-232CT-A

9-Pin DTE

Figure B-3. Cable Configuration for 9-pin DTE to 25-pin DCE with Handshaking

Interfacing to a DCE without Handshaking

If your serial device does not require or use the hardware handshaking
protocol used by the GPIB-232CT-A, you have the following two options:

• Use a minimum configuration cable which does not support
hardware handshaking and use XON/XOFF software handshaking
(if necessary). To create a minimum configuration cable, connect
the signals shown in bold italics in Table B-2.

• Wire a custom cable that properly interfaces the GPIB-232CT-A
hardware handshaking protocol to the handshaking protocol of your
serial device.

1

8

9
10
11
12
13

Serial Device

25-Pin DCE

14
15
16
17
18
19
20
21
22
23
24
25

Minimum Configuration Cable

The minimum configuration cable assumes that the DCE does not require
external hardware handshaking. The minimum configuration for a DTE
9-pin to DCE 9-pin cable is shown in Figure B-4. Figure B-5 shows an
equivalent 9-pin to 25-pin cable.

GPIB-232CT-A for MacOS B-4 www.ni.com

Appendix B Interfacing to a Serial Device

1

6
7
8
9

5

GPIB-232CT-A

9-Pin DTE

5

9
8
7
6

1

Serial Device

9-Pin DCE

Figure B-4. Minimum Configuration for 9-pin DTE to 9-pin DCE

1

6
7
8
9

5

GPIB-232CT-A

9-Pin DTE

1

14
15
16

4

17

5

18

6

19
20

8

21

9
10
11
12
13

22
23
24
25

Serial Device

25-Pin DCE

Figure B-5. Minimum Configuration for 9-pin DTE to 25-pin DCE

Custom Cables

If your application requires a custom cable, you can construct one if
you have a thorough knowledge of the handshaking protocols involved.
Review the RS-232 characteristics of your serial de vice and build the cable
to properly connect the handshake lines of the two devices. Because the
DTE-to-DCE connection is a straight across connection, it often involves
only connecting RTS to RTS, CTS to CTS, DTR to DTR, and so on. If the
documentation for your serial device does not provide a thorough
explanation of its handshaking protocol, the ANSI/EIA-232-C standard is
a good reference, provided your device conforms to the RS-232 protocol.

Caution Although handshaking might not be required, it is best to use some form of

handshaking to prevent loss of data.

© National Instruments Corporation B-5 GPIB-232CT-A for MacOS

Appendix B Interfacing to a Serial Device

Interfacing to a DTE with Handshaking

For serial devices set up as DTEs, you must wire a DTE-to-DTE interface
cable, commonly known as a null modem cable. The cable allows the
GPIB-232CT-A to act as though it is communicating with a DCE, but it
swaps the appropriate pins to achieve a DTE configuration. This wiring
configuration is shown in Table B-2.

Table B-2.

GPIB-232CT-A Signal to

DTE Serial Device Signal

RXD to TXD
TXD to RXD

Cable Wiring Scheme for GPIB-232CT-A DTE to Serial Device DTE

Standard
DTE to DTE
9-pin 9-pin

1

1

2 to 3 2 to 2
3 to 2 3 to 3

Standard

DTE to DTE

9-pin 25-pin

DTR to DSR 4 to 6 4 to 6

GND to GND

1

5 to 5 5 to 7

RTS to CTS 7 to 8 7 to 5
CTS to RTS 8 to 7 8 to 4

1

The connections must be implemented.

Figure B-6 shows a typical 9-pin to 9-pin null modem cable with the RTS,
CTS, and DTR handshake lines implemented. Figure B-7 shows an
equivalent 9-pin DTE to 25-pin DTE cable configuration.

The cable configuration in Figure B-6 allows you to connect to the 9-pin
serial port of a personal computer. The cable in Figure B-7 shows how to
connect to the 25-pin serial port of a personal computer.

1

6
7
8
9

5

GPIB-232CT-A

9-Pin DTE

Figure B-6.

GPIB-232CT-A for MacOS B-6 www.ni.com

Cable Configuration for 9-pin DTE to 9-pin DTE with Handshaking

5

9
8
7
6

1

Serial Device

9-Pin DTE

Appendix B Interfacing to a Serial Device

1

6
7
8
9

5

GPIB-232CT-A

9-pin DTE

Figure B-7. Cable Configuration for 9-pin DTE to 25-pin DTE with Handshaking

Interfacing to a DTE without Handshaking

If your serial device does not require or use the same hardware handshaking
protocol used by the GPIB-232CT-A, you have the following two options:

• Use a minimum configuration null modem cable which does not
support the hardware handshake lines and use XON/XOFF software
handshaking (if necessary). To create a minimum configuration cable,
connect the signals shown in bold italics in Table B-3.

• Wire a custom cable that properly interfaces the GPIB-232CT-A
hardware handshaking protocol to the handshaking protocol of your
serial device.

1

14
15
16
17
18
19

8

9
10
11
12
13

20
21
22
23
24
25

Serial Device

25-pin DTE

Minimum Configuration Cable

The minimum cable configuration assumes that the serial device does not
require external hardware handshaking. The minimum configuration for a
9-pin to 9-pin null modem cable is shown in Figure B-8. Figure B-9 shows
an equivalent 9-pin to 25-pin cable.

© National Instruments Corporation B-7 GPIB-232CT-A for MacOS

Appendix B Interfacing to a Serial Device

6
7
8
9

5

GPIB-232CT-A

9-Pin DTE

1

5

9
8
7
6

1

Serial Device

9-Pin DTE

Figure B-8. Minimum Configuration for 9-pin DTE to 9-pin DTE

1

6
7
8
9

5

GPIB-232CT-A

9-Pin DTE

1

14
15
16
17
18

6

19
20

8

21

9
10
11
12
13

22
23
24
25

Serial Device

25-Pin DTE

Figure B-9. Minimum Configuration for 9-pin DTE to 25-pin DTE

Custom Cables

If your application requires a custom cable, you can construct one if you
have a thorough knowledge of the handshaking protocols in volv ed. Revie w
the RS-232 characteristics of your serial device and build the cable to
properly connect the handshake lines of the two devices. If the
documentation for your serial device does not provide a thorough
explanation of its handshaking protocol, the ANSI/EIA-232-C standard is
a good reference, provided your device conforms to the RS-232 protocol.

Caution Although handshaking might not be required, it is best to use some form of

handshaking to prevent loss of data.

GPIB-232CT-A for MacOS B-8 www.ni.com

Appendix B Interfacing to a Serial Device

Interfacing the GPIB-232CT-A to the Macintosh

T able B-3 shows the wiring scheme needed to create a cable to connect the
GPIB-232CT-A to a Macintosh serial port.

Table B-3.

Cable Wiring Scheme for GPIB-232CT-A DTE to Macintosh Serial Port

GPIB-232CT-A Signal

to Macintosh Serial Port

9-pin

D-Sub

to

8-pin

Mini-DIN

RXD to TXD– 2 to 3
TXD to RXD– 3 to 5
GND to GND, RXD+ 5 to 4,8
RTS to HSKi 7 to 2
CTS to HSKo 8 to 1

Figure B-10 shows a properly configured GPIB-232CT-A DTE
(9-pin D-Sub) to Macintosh (8-pin Mini -DIN) cable.

1

6
7
8
9

5

GPIB-232CT-A

9-Pin DTE

876

543

12

Macintosh Serial Port

8-Pin Mini-DIN (Back)

Figure B-10.

© National Instruments Corporation B-9 GPIB-232CT-A for MacOS

Cable Configuration for 9-pin DTE to 8-pin Mini-DIN

Technical Support Resources

This appendix describes the comprehensive resources available to you in
the Technical Support section of the National Instruments Web site and
provides technical support telephone numbers for you to use if you have
trouble connecting to our Web site or if you do not have internet access.

NI Web Support

To provide you with immediate answers and solutions 24 hours a day,
365 days a year, National Instruments maintains extensi ve online technical
support resources. They are available to you at no cost, are updated daily,
and can be found in the Technical Support section of our Web site at

www.ni.com/support

Online Problem-Solving and Diagnostic Resources

• KnowledgeBase—A searchable database containing thousands of

frequently asked questions (F A Qs) and their corresponding answers or
solutions, including special sections devoted to our newest products.
The database is updated daily in response to new customer experiences
and feedback.

• Troubleshooting Wizards—Step-by-step guides lead you through

common problems and answer questions about our entire product line.
Wizards include screen shots that illustrate the steps being described
and provide detailed information ranging from simple getting started
instructions to advanced topics.

• Product Manu als—A comprehensive, searchable library of the latest

editions of National Instruments hardware and software product
manuals.

• Hardware Reference Database—A searchable database containing

brief hardware descriptions, mechanical drawings, and helpful images
of jumper settings and connector pinouts.

• Application Notes—A library with more than 100 short papers

addressing specific topics such as creating and calling DLLs,
developing your own instrument driver software, and porting
applications between platforms and operating systems.

C

© National Instruments Corporation C-1 GPIB-232CT-A for MacOS

Appendix C Technical Support Resources

Software-Related Resources

• Instrument Driver Network—A library with hundreds of instrument

drivers for control of standalone instruments via GPIB, VXI, or serial
interfaces. You also can submit a request for a particular instrument
driver if it does not already appear in the library.

• Example Programs Database—A database with numerous,

non-shipping example programs for National Instruments
programming environments. You can use them to complement the
example programs that are already included with National Instruments
products.

• Software Library—A library with updates and patches to application

software, links to the latest versions of driver software for National
Instruments hardware products, and utility routines.

Worldwide Support

National Instruments has offices located around the globe. Many branch
offices maintain a Web site to provide information on local services. You
can access these Web sites from

www.ni.com/worldwide

If you have trouble connecting to our Web site, please contact your local
National Instruments office or the source from which you purchased your
National Instruments product(s) to obtain support.

For telephone support in the United States, dial 512 795 8248. For
telephone support outside the United States, contact your local branch
office:

Australia 03 9879 5166, Austria 0662 45 79 90 0, Belgium 02 757 00 20,
Brazil 011 284 5011, Canada (Calgary) 403 274 9391,
Canada (Ontario) 905 785 0085, Canada (Québec) 514 694 8521,
China 0755 3904939, Denmark 45 76 26 00, Finland 09 725 725 11,
France 01 48 14 24 24, Germany 089 741 31 30, Greece 30 1 42 96 427,
Hong Kong 2645 3186, India 91805275406, Israel 03 6120092,
Italy 02 41309 1, Japan 03 5472 2970, Korea 02 596 7456,
Mexico (D.F.) 5 280 7625, Mexico (Monterrey) 8 357 7695,
Netherlands 0348 433466, Norway 32 27 73 00, Poland 48 22 528 94 06,
Portugal 351 1 726 9011, Singapore 2265886, Spain 91 640 0085,
Sweden 08 58 7 895 00, Switzerland 056 200 51 51,
Taiwan 02 2377 1200, United Kingdom 01635 523545

GPIB-232CT-A for MacOS C-2 www.ni.com

Glossary

Prefix Meaning Value

m- milli- 10

k- kilo- 10

M- mega- 10

° degrees
% percent
A amperes
AC alternating current
ANSI American National Standards Institute
C Celsius
CSA Canadian Standards Association

–3

3

6

CTS Clear to Send
DIP dual inline package
EIA Electronic Industries Association
EMI electromagnetic interference
FCC Federal Communications Commission
g grams
GND ground
GPIB General Purpose Interface Bus
Hz hertz
IBIC Interface Bus Interactive Control
IEC International Electrotechnical Commission

© National Instruments Corporation G-1 GPIB-232CT-A for MacOS

Glossary

IEEE Institute for Electrical and Electronic Engineers
in. inches
LED light-emitting diode
m meters
MB megabytes of memory
oz ounces
R TS Request to Send
RXD Receive Data
s seconds
TIMO Time limit exceeded
TXD Transmit Data
UL Underwriters Laboratories
V volts
VAC volts alternating current
VDC volts direct current

GPIB-232CT-A for MacOS G-2 www.ni.com