Ibloc, Ibloc -28 – Measurement Computing GPIB-488 User Manual
Page 41
Chapter 3
GPIB 488.1 Library Reference
3-28
GPIB-488
IBLOC
Forces the specified board/device to go to local program mode.
Syntax
C
ibloc (int boarddev)
Parameters
boarddev
is an integer containing the device or board handle.
Returns
ibsta
will contain a 16-bit status word as described in Appendix B,
.
iberr
will contain an error code, if an error occurred.
Usage Notes
This routine is used to place boards or devices temporarily in local mode. If this routine
specifies a device, the following GPIB commands are sent:
•
Talk address of the access board
•
Secondary address of the access board
•
Unlisten (UNL)
•
Listen address of the device
•
Secondary address of the device (as necessary)
•
Go to Local (GTL)
If this routine specifies a board, the board is placed in a local state by sending the Return to
Local (RTL) message, if it is not locked in remote mode. The LOK bit of the status word
indicates whether the board is in a lockout state. The
IBLOC
function is used to simulate a
front panel RTL switch if the computer is used as an instrument.
Example
Return GPIB board 1 to local state.
C
int gpib1;
gpib1 = ibfind("GPIB1");
ibloc (gpib1);