Measurement-computing GPIB-488 Manual de usuario descargar pdf (Pagina 98)

Chapter 4 GPIB 488.2 Library Reference

Programming Reference Manual 4-30 GPIB-488

WaitSRQ

Wait until a device asserts SRQ.

Syntax

C WaitSRQ(int board, short *result)

Parameters

board is an integer which identifies the GPIB board to use for this operation. In most

applications, this value is 0.

Returns

result indicates whether or not an SRQ occurred. If an SRQ occurs before the timeout

expires,

result = 1. Otherwise, result = 0.

ibsta will contain a 16-bit status word as described in Appendix B, IBSTA.

iberr will contain an error code, if an error occurred.

Usage Notes

This call suspends operation until a device requests service or a timeout occurs. Follow this

call with a

FindRQS call to determine which device needs service.

Example

Wait for a GPIB device to request service and then ascertain if device 6 or 7 requires service.

C short addresslist[3] = {6,7,NOADDR};

short resultlist[3];

short result;

WaitSRQ (0,&result);

if (result == 1)

{FindSRQ (0, addresslist, resultlist)}

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Measurement-computing GPIB-488 Manual de usuario Pagina 98