R&S NRP
Remote Control - Commands
1144.1400.12 6.125
E-3
ATN
(Attention)
Active LOW indicates the transmission of interface messages;
non-active HIGH indicates the transmission of device messages.
SRQ
(Service Request)
Active LOW enables a device to send a service request to the controller.
REN
(Remote Enable)
Active LOW allows switchover to the remote control mode.
EOI
(End or Identify)
together with ATN has two functions:
ATN = HIGH: active LOW marks the end of data transmission.
ATN = LOW: active LOW triggers a parallel poll.
3. Handshake bus with three lines
DAV
(Data Valid)
Active LOW signals a valid data byte on the data bus.
NRFD
(Not Ready For Data)
Active LOW signals that one of the connected devices is not ready to accept data.
NDAC
(Not Data Accepted)
Active LOW until the connected device has accepted the data on the bus.
