Interface Page 79 of 79
3.5.2 IEEE-488 & RS-232 Commands
Table 3-3
IEEE-488 Interface Connections
Signal Name Pin Number Function ___________________
DAV 6 Low state: "Data is Available" and valid on DI01
through DI08
NRFD 7 Low state: At least one listener on the bus is "Not
ready for Data".
NDAC 8 Low state: At least one listener on the bus is "Not
Accepting Data".
ATN 11 "Attention" specifies 1 of 2 uses for the DI01
through DI08 lines
Low state - Controller command messages
High state - Data bytes from the talker device
IFC 9 "Interface Clear"
Low state - Returns portions of interface system to a
known quiescent state.
SRQ 10 "Service Request"
Low state - a talker or listener signals (to the
controller) need for attention in the midst of the
current sequence of events
REN 17 "Remote Enable"
Low state - enables each device to enter remote
mode when addressed to listen
High state - all devices revert to local control
EOI 5 "End of Identify" if ATN is in high state, then low
state of EOI indicates end of a multiple-byte data
transfer sequence. If ATN is in low state, then
low state of EOI activates a parallel poll.
DI01 1 The 8-line data bus, which conveys interface
DI02 2 messages (ATN low state) or device-dependent
DI03 3 messages (ATN high state), such as remote-
DI04 4 control commands from the controller or from a
DI05 13 talker device
DI06 14
DI07 15
DI08 16
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