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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