ES User’s Guide 7-9
Front/Rear Panel
Connectors
Table 7-2 General Bus Management Lines
Name Mnemonic Description
Attention ATN Controls whether the bus is in Command Mode
(ATN TRUE) or Data Mode (ATN FALSE).
Interface Clear IFC Initializes the interface to an idle state (no activity
on the bus).
Service Request SRQ Alerts the Controller to a need for communication.
Remote Enable REN Enables devices to respond to Remote Program
Control when addressed to listen.
End Or Identify EOI Indicates last data byte of a multibyte sequence;
also used with ATN to parallel poll devices for their
status bit.
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