bus refers to the GPIB bus number. If you have only one GPIB interface in your computer, the default bus number is 0.

Refer to the software installation instructions included with the GPIB controller for additional GPIB interfaces.

address list tests for the presence of a Listener for all devices listed in address list.

If the function does not detect a listening device at the particular primary address, it tests all the secondary addresses associated with that primary address.

limit If more Listeners are present on the bus than limit specifies, the function truncates listener address list after limit entries.

error in describes error conditions that occur before this node runs. This input provides standard error in functionality.

listener address list contains the addresses of all the Listeners the function finds.

status is a Boolean array in which each bit describes a state of the GPIB Controller.

If an error occurs, the function sets bit 15. GPIB error is valid only if bit 15 of status is set.

The following table shows the numeric value and symbolic status of each bit in status. This table also includes a description of each bit.

Status Bit	Numeric Value	Symbolic Status	Description
0	1	DCAS	Device Clear state
1	2	DTAS	Device Trigger State
2	4	LACS	Listener Active
3	8	TACS	Talker Active
4	16	ATN	Attention Asserted
5	32	CIC	Controller-In-Charge
6	64	REM	Remote State
7	128	LOK	Lockout State
8	256	CMPL	Operation Completed
12	4096	SRQI	SRQ Detected while CIC
13	8192	END	EOI or EOS Detected
14	16384	TIMO	Timeout
15	-32768	ERR	Error Detected

number of listeners contains the number of addresses placed in listener address list.

error out contains error information. This output provides standard error out functionality.