Measurement-computing GPIB-488 Bedienungsanleitung PDF herunterladen (Seite 40)

Chapter 3 GPIB 488.1 Library Reference

GPIB-488 3-27 Programming Reference Manual

IBLN

Check that a device is present on the bus.

Syntax

C ibln (int board, int pad, int sad, short* listen)

Parameters

board is the board or device handle.

pad is the primary address of the GPIB device (0-30).

sad is the secondary address of the GPIB device (96-126 or 0x60-0x7e) or one of the constant

values NO_SAD or ALL_SAD.

listen is the variable that the result is returned to.

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.

listen will contain 0 if no listener is found. Contains non-zero if a listener is found.

Usage Notes

Set sad = NO_SAD (0) if the device does not have a secondary address.

Set

sad = ALL_SAD (-1) if you do not know the device’s secondary address and you want

all possible secondary addresses to be tested.

Example

This example tests for the presence of a device with a GPIB address of 4.

C int board, listen;

board = ibfind (“GPIB0”);

ibln (board, 4, NO_SAD, &listen);

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Measurement-computing GPIB-488 Bedienungsanleitung Seite 40