Findrqs, Findrqs -8 – Measurement Computing GPIB-488 User Manual
Page 76
Chapter 4
GPIB 488.2 Library Reference
4-8
GPIB-488
FindRQS
Identify the device requesting service.
Syntax
C
FindRQS(int board, short addresslist[], short
*result)
Parameters
board
is an integer which identifies the GPIB board to be used for this operation. In most
applications, this value is 0.
addresslist
is an array of GPIB addresses, terminated by the value
NOADDR
. The devices
located at these addresses are serial polled until the one asserting SRQ is located.
Returns
result
will contain the returned status byte of the device asserting SRQ.
ibcnt
will contain the index (in
addresslist
) identifying the device's address.
ibsta
will contain a 16-bit status word as described in Appendix B,
.
iberr
will contain an error code, if an error occurred.
iberr
contains the error code
ETAB
,
if no device is requesting service. In this case,
ibcn
t contains
NOADDR
's index.
iberr
will contain the error code
EABO
if a device times out while responding to its serial
poll. In this case,
ibcnt
contains the index of the timed-out device.
Usage Notes
None.
Example
Identifies which of the devices at GPIB addresses 6 and 7 (connected to board 0) is requesting
service.
C
short addresslist[3] = {6,7,NOADDR};
short result;
FindRQS (0, addresslist, &result);