Hardware Interfaces
R&S
®
SMW200A
1242User Manual 1175.6632.02 ─ 16
SRQ (Service Request): active LOW enables the connected device to send a ser-
vice request to the controller.
REN (Remote Enable): active LOW permits switchover to remote control.
EOI (End or Identify): has two functions in connection with ATN:
– ATN=HIGH active LOW marks the end of data transmission.
– ATN=LOW active LOW triggers a parallel poll.
●
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 devi-
ces is not ready for data transfer.
NDAC (Not Data Accepted): active LOW signals that the instrument connected is
accepting the data on the data bus.
Interface functions
Instruments which can be controlled via GPIB-bus interface can be equipped with dif-
ferent interface functions. Table E-1 lists the interface functions for the R&S SMW.
Table E-1: GPIB-bus interface functions
Control character Interface function
SH1 Handshake source function (source handshake), full capability
AH1 Handshake sink function (acceptor handshake), full capability
L4 Listener function, full capability, de-addressed by MTA.
T6 Talker function, full capability, ability to respond to serial poll, dead-
dressed by MLA
SR1 Service request function (Service Request), full capability
PP1 Parallel poll function, full capability
RL1 Remote/Local switch over function, full capability
DC1 Reset function (Device Clear), full capability
DT1 Trigger function (Device Trigger), full capability
GPIB-Bus Interface
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