Measurement-computing GPIB-488 Uživatelský manuál stáhnout pdf (Strana 20)

Chapter 3 GPIB 488.1 Library Reference

GPIB-488 3-7 Programming Reference Manual

IBCLR

Clears a specified device.

Syntax

C ibclr (int device)

Parameters

device is an integer containing the device handle.

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.

Usage Notes

When this routine is executed, the GPIB Interface Board (which is currently the CIC) sends

its talk address over the GPIB. This makes it the active talker. It then unlistens all devices and

addresses the specified device as a listener. Finally, the GPIB board clears the device, by

sending the

Selected Device Clear message.

Example

This example uses ibdev to return the unit descriptor for a device at PAD 5, a DMM, into the

variable dmm. The DMM is then cleared.

C int dmm;

dmm = ibdev(0,5,0,13,1,0);

/*open instrument*/

ibclr (dmm);

/* clear it */

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Measurement-computing GPIB-488 Uživatelský manuál Strana 20