ppendix D: IEEE-488 bus overview Model 6517B Electrometer Reference Manual
D-4 6517B-901-01 Rev. C / August 2015
Bus management lines
The five bus management lines help to ensure proper interface control and management. These lines
are used to send the uniline commands.
ATN (attention): The ATN line is one of the more important management lines because the state of
this line determines how information on the data bus is interpreted.
IFC (interface clear): As the name implies, the IFC line controls clearing of instruments from the bus.
REN (remote enable):The REN line is used to place the instrument on the bus in the remote mode.
EOI (end or identify): The EOI is usually used to mark the end of a multi-byte data transfer sequence.
SRQ (service request): This line is used by devices when they require service from the controller.
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