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II. SOFTWARE GUIDES - 10. Driver488/W31 10C. External Device Interfacing

Personal488 User’s Manual, Rev. 3.0 II-203

10C. External Device Interfacing

Topics

• Introduction.................................................................................. II-202

Subroutine Calls.................................................................................................II-202

• Configuration of Named Devices.............................................. II-202

• Use of External Devices.............................................................. II-204

• Extensions For Multiple Interfaces ......................................... II-204

Duplicate Device Names .............................................................................II-205

Access of Multiple Interfaces......................................................................II-205

Example.........................................................................................................II-205

Introduction

This Sub-Chapter is a technical review of external device interfacing. It contains information on how

to use external devices and multiple interfaces.

Driver488/W31 controls I/O adapters and their attached external devices. In turn, Driver488/W31 is

controlled via subroutine calls.

Driver488/W31 communicates directly with I/O adapters such as an IEEE 488 interface board. More

than one I/O adapter may reside on a single plug-in board. For example, the IEEE 488 interface board

contains the IEEE 488 I/O adapter.

I/O adapters connect to external devices such as digitizers, multimeters, plotters, and oscilloscopes

(IEEE 488 interface); and serial devices such as printers, plotters, and modems. However,

Driver488/W31 allows direct control of IEEE 488 external devices only.

Note: To reiterate, Driver488/W31 supports IEEE 488 external devices, and does not support serial

external devices.

Driver488/W31 is controlled by sending data and commands, and receiving responses and status by

subroutine calls. This method is the only Application Program Interface, API, available to connect the

application (user’s) program to Driver488/W31.

Subroutine Calls

The subroutine API is a library of subroutines linked to the application program that are invoked like

any other subroutines in that programming language. Once invoked, these routines can control

Driver488/W31.

Configuration of Named Devices

Named devices provide a method to maintain a permanent record of an external device’s configuration

that does not change between application programs. Once the configuration of a particular external

device is established, its Driver488/W31 configuration for that device will remain the same until the

next time you reconfigure it or unload and reload the driver. The external devices supported by

Driver488/W31 are IEEE 488 external devices only.

External devices are most easily configured at installation. For Driver488/W31, the device names,

terminators, timeout period, and bus addresses may be entered into a configuration file (either manually

or using the

CONFIG

utility) which contains the device configuration information. This configuration

file is automatically read during driver load to install the configured named devices. The application

program can then refer to the external device by name and have all of the configuration information

automatically set.

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