Ieee-488 & Rs-232 Commands - QuadTech Guardian 2500 Series Instruction Manual

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