GPIB Interface Management Lines

NI-488.2

GPIB Interface Management Lines

The following table summarizes the GPIB interface management lines.

Line Description
ATN
(attention)
Controller drives ATN true when it sends commands and false when it sends data messages.
IFC
(interface clear)
System Controller drives the IFC line to initialize the bus and make itself CIC.
REN
(remote enable)
System Controller drives the REN line to place devices in remote or local program mode.
SRQ
(service request)
Any device can drive the SRQ line to asynchronously request service from the Controller.
EOI
(end or identify)
Talker uses the EOI line to mark the end of a data message. Controller uses the EOI line when it conducts a parallel poll.