Measurement Computing GPIB-488 - Manual (Page 91)

Chapter 4 GPIB 488.2 Library Reference
GPIB-488 4-23 Programming Reference Manual
SendLLO
Sends Local Lockout (LLO) message to all GPIB devices.
Syntax
C SendLLO(int board)
Parameters
board is an integer which identifies the GPIB board to be used for this operation. In most
applications, this value is 0.
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.
Usage Notes
When this routine is executed, the specified GPIB board sends the GPIB Local Lockout
(LLO) message to all devices. This means that once they have been addressed as listeners, the
devices respond only to messages sent over the GPIB by the Controller. (In other words, they
can not be locally programmed from front panel controls.) Only the Controller can return
them to a local programming state.
Example
In this example, GPIB board 0 sends a Local Lockout to its connected GPIB devices.
C SendLLO (0);