National Instruments GPIB-MAC User Manual page 40

November 1985
Syntax:
Purpose: You use cat to change the GPIB-MAC from Standby
Controller to Active Controller and when the I/O and bus
management functions do not meet the needs of your
device. cat allows you more precise control over the
GPIB than the I/O and bus management functions.
Remarks: If the argument
immediately; that is, it takes control asynchronously. If
the argument
after any handshake that is in progress completes; that is,
it takes control synchronously.
If you call cat without an argument, the GPIB-MAC
returns to you the current controller status, which is 0 if
the GPIB-MAC is m the Active Controller and1 if the
GPIB-MAC h the Active Controller.
If call cat with an argument and the GPIB-MAC is not
CIC, the GPIB-MAC records the ECIC error.
The power-on Controller status of the GPIB-MAC is
Idle Controller.
Refer also to
29 SECTION FOUR - FUNCTIONS
is 1, the GPIB-MAC takes control
is 0, the GPIB-MAC takes control
sic.
and