Ibcmd, Ibcmd -8 – Measurement Computing GPIB-488 User Manual
Page 21
Chapter 3
GPIB 488.1 Library Reference
3-8
GPIB-488
IBCMD
Sends GPIB commands.
Syntax
C
ibcmd (int board, char cmnd[], long bytecount)
Parameters
board
is an integer containing the board handle.
cmnd
is the command string to be sent. This string is comprised of GPIB multiline commands.
These commands are listed in Appendix A,
bytecount
is the number of command bytes to be transferred.
Returns
ibsta
will contain a 16-bit status word as described in Appendix B,
.
iberr
will contain an error code, if an error occurred.
ibcnt
,
ibcntl
will contain the number of bytes that were transferred.
ibcnt
is a 16-bit
integer.
ibcntl
is a 32-bit integer. If the requested count was greater than 64 K, use
ibcntl
instead of
ibcnt
.
Usage Notes
This routine passes only GPIB commands. It cannot be used to transmit programming
instructions (data) to devices. Use the
ibrd
and
ibwrt
routines for this purpose.
This routine terminates when any one of the following takes place:
•
Commands transfer is successfully completed.
•
An error occurs
•
A timeout occurs
•
A Take Control (TCT) command is sent
•
The system controller asserts the IFC (Interface Clear) line.