Measurement-computing GPIB-488 Manuel d'utilisateur télécharger pdf (Page 43)

Chapter 3 GPIB 488.1 Library Reference

Programming Reference Manual 3-30 GPIB-488

IBPAD

Changes the primary address assigned to a device or interface board.

Syntax

C ibpad (int boarddev, int address)

Parameters

boarddev is an integer containing the board or device handle.

address specifies the new primary GPIB address. Valid primary addresses range from 0 to

30 (0 to 1E hex).

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. Contains the previous primary address

if no error occurred.

EARG error occurs if address is out of range.

Usage Notes

This routine temporarily changes the configuration setting. It remains in effect until ibonl or

ibfind is called, ibpad is called again, or the system is re-started.

If a device is specified, its talk and listen addresses are assigned on the basis of

address. Its

Listen Address equals

address + 20 hex. Its Talk Address equals address + 40 hex. Thus,

if a primary address of 0D hex was specified, the corresponding Listen Address would be 2D

hex (MLA 13) and Talk Address would be 4D hex (MTA 13). If a board is specified, the board

is assigned the primary address defined by

address. Refer also to ibsad and IBONL.

Be sure that the address specified agrees with the GPIB address of the device. (Set with

hardware switches or by a software program. Refer to the device's documentation for more

information.)

Example

This example changes the primary GPIB address associated with a DVM at PAD 4 to 1C hex.

C int dvm;

dvm = ibdev (0,4,0,13,1,0);

ibpad (dvm, 0x1C);

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 115 116

Pas de commentaire

Measurement-computing GPIB-488 Manuel d'utilisateur Page 43