Remote Control Basics > Remote Control Interfaces and Protocols > GPIB Interface (IEC/IEEE Bus Interface) > GPIB Interface Messages > Universal Commands
Universal Commands

Universal commands are encoded in the range 10 through 1F hex. They affect all instruments connected to the bus and do not require addressing.

Command

Effect on the instrument

DCL (Device Clear)

Aborts the processing of the commands just received and sets the command processing software to a defined initial state. Does not change the instrument settings.

IFC (Interface Clear) *)

Resets the interfaces to the default setting.

LLO (Local Lockout)

The LOC/IEC ADDR key is disabled.

SPE (Serial Poll Enable)

Ready for serial poll.

SPD (Serial Poll Disable)

End of serial poll.

PPU (Parallel Poll Unconfigure)

End of the parallel-poll state.

*) IFC is not a real universal command, it is sent via a separate line; however, it also affects all instruments connected to the bus and does not require addressing

 


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