R&S SMB Hardware Interfaces
1407.0806.32 8.3 E-2
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 connected device to send a service 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.
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 for data transfer.
NDAC (Not Data Accepted) active LOW signals that the instrument connected is accepting the data on the data bus.
IEC/IEEE-Bus Interface Functions
Instruments which can be remote controlled via the IEC/IEEE bus can be equipped with different
interface functions. The following table lists the interface functions appropriate for the instrument.
Table 8-1 IEC/IEEE 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, unaddress if MTA.
T6
Talker function, full capability, ability to respond to serial poll, unaddress if 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
C0
No controller function
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