
- Data bus with 8 lines D0 to D7:
The transmission is bit-parallel and byte-serial in the ASCII/ISO code. D0 is the least significant bit, D7 the most significant bit. - Control bus with five 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. - 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.
Instruments which can be controlled via GPIB bus can be equipped with different interface functions. The interface function for the R&S SMC are listed in the following table.
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, deaddressed 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 |
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