Annex > Hardware Interfaces > GPIB Bus Interface
GPIB Bus Interface
Pin assignment
Pin assignment of GPIB bus interface
Bus lines
  • 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.
Interface Functions

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.

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, 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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