Measurement-computing Personal488 rev.3.0 For DOS & Windows 3.Xi Manual de usuario descargar pdf (Pagina 149)

9A. Introduction II. SOFTWARE GUIDES - 9. Driver488/SUB

II-134 Personal488 User’s Manual, Rev. 3.0

9. Driver488/SUB

Sub-Chapters

9A. Introduction .............................................................................II-133

9B. Installation & Configuration................................................II-134

9C. External Device Interfacing .................................................II-141

9D. Getting Started........................................................................II-145

9E. C Languages ............................................................................II-150

9F. QuickBASIC..............................................................................II-159

9G. Pascal.........................................................................................II-166

9H. Data Transfers *.......................................................................II-175

9I. Operating Modes * ..................................................................II-177

9J. Utility Programs......................................................................II-182

9K. Command Descriptions *.......................................................II-186

9L. Command Reference *............................................................II-190

* For Driver488/SUB, W31, W95, & WNT

9A. Introduction

Driver488/SUB is similar to Driver488/DRV in that it uses HP (Hewlett-Packard) style commands, has

COM port support, offers asynchronous I/O capability, provides automatic event vectoring and error

checking, and transfers data at the maximum DMA rate of the board being controlled.

Like Driver488/DRV, Driver488/SUB supports the Power488 series boards’ additional input/output

functions with SCPI (Standard Command for Programmable Instruments).

Driver488/SUB differs from Driver488/DRV in programming style and performance. You can access

the memory-resident Driver488/SUB via a library of function calls, allowing for faster input/output

operations. You can use Driver488/SUB with any of the languages for which function call libraries are

offered, including: C, Pascal, and QuickBASIC.

The following example of programming a digital multimeter highlights the programming style

differences between Driver488/DRV and Driver488/SUB:

Driver488/DRV, using C Language Driver488/SUB, using C Language

main ( )

{

ieeeinit ( );

ieeewt (Output dmm; R0T1X”);

Ieeewt (“Enter dmm”);

ieeerd (val);

}

main ( )

{

OpenName (dmm. “DMM”);

Output (dmm, “R0T1X)

Enter (dmm, val);

}

Driver488/SUB lets you obtain optimal use of your PC’s conventional 640K byte memory by

automatically detaching and loading itself into high memory (when used with a test system employing

DOS 5.0 or higher). If sufficient high memory is available, Driver488/SUB will not consume any

conventional memory. This makes the driver particularly useful for applications executing long

programs demanding large amounts of memory.

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Measurement-computing Personal488 rev.3.0 For DOS & Windows 3.Xi Manual de usuario Pagina 149

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