Ibpad – Measurement Computing GPIB-488 User Manual
Page 43
Chapter 3
GPIB 488.1 Library Reference
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,
.
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
.
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);