Measurement-computing GPIB-488 Instrukcja Użytkownika Pobierz pdf (Strona 55)

Chapter 3 GPIB 488.1 Library Reference

Programming Reference Manual 3-42 GPIB-488

IBRSV

Changes the serial poll response byte.

Syntax

C ibrsv (int board, int statusbyte)

Parameters

board is an integer containing the board handle.

statusbyte represents the serial poll response byte of the GPIB Interface Board. The serial

poll response byte is system-specific, with the exception of bit 6 (hex 40). If bit 6 (hex 40) is

set, then the SRQ line is asserted to indicate to the Controller-In-Charge that the board is

requesting service.

Returns

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

iberr will contain an error code, if an error occurred. If no error occurs, iberr will contain

the previous value of

statusbyte.

Usage Notes

This routine is used when the specified GPIB Interface Board is not the Controller-In-Charge.

It can be used to request service (set bit 6 of the serial response byte) from the

Controller-In-Charge or to change the value of GPIB Interface Board's serial poll response

byte.

Example

This example sets the GPIB Interface Board 1 serial poll status byte to 41 hex (assert SRQ)

which indicates that the board requires service.

C int gpib1;

gpib1 = ibfind ("gpib1");

ibrsv (gpib1, 0x41);

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Measurement-computing GPIB-488 Instrukcja Użytkownika Strona 55