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SET_ALM

Establishes an alarm condition (code) in the unit forcing the ALARM LED to illuminate.

CMD: '!'
DATA: alarm code (1 byte)

Code zero means no alarm condition, so asserting this command with argument zero effectively clears the alarm condition turning the ALM LED off. This can also be done using address Fh (broadcast) to clear all units at once.

Broadcasting an alarm code other than zero is illegal resulting in error.