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Appendix D: IEEE-488 bus overview
Model 6517B Electrometer Reference Manual
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.
D-4
6517B-901-01 Rev. C / August 2015
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