Hi Tim,

I tried the variable byte for the command. ie skipping the command byte and putting it in the data fields. (I2CWRITE PORTA.1, PORTC.1, $4E, [$A0, $00, $00] )

It does transmit the $4e , the $A0 and one $00. It does however, NACK all bytes. It does not go into command mode. Only status data when trying to retrieve alarm info is returned with a 0x02 meaning it was NACKed.

Still at a loss.

Joe Rapoza