Interfaces R&S®SML / R&S®SMV03
1090.3123.12 E-6 5.26
2. Control bus with 5 lines
IFC
(Interface Clear):
Active LOW resets the interfaces of the instruments connected to the default setting.
ATN (Attention):
Active LOW signals the transmission of interface messages.
Inactive HIGH signals the transmission of device messages.
SRQ (Service Request):
Active LOW enables the instrument to send a service request to the controller.
REN (Remote Enable):
Active LOW enables switchover to remote control.
EOI (End or Identify):
This has two functions in conjunction with ATN:
ATN = HIGH Active LOW marks the end of a data transmission.
ATN = LOW Active LOW triggers a parallel poll.
3. Handshake bus with 3 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 devices connected is not ready to accept data.
NDAC (Not Data Accepted):
Active LOW as long as the instrument is accepting the data present on the data bus.
Interface Functions
Instruments which can be remote-controlled via the IEC/IEEE bus can be equipped with different
interface functions. Table 5-5 lists the interface functions relevant for the instrument.
Table 5-5 Interface functions
Control
character
Interface functions
SH1 Handshake source function (Source Handshake)
AH1 Handshake drain function (Acceptor Handshake)
L4 Listener function
T6 Talker function, ability to respond to serial poll
SR1 Service request function (Service Request)
PP1 Parallel poll function
RL1 Remote/local switchover function
DC1 Reset function (Device Clear)
DT1 Trigger function (Device Trigger)
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