Thanks for the quick reply! If I set power to Bus #1, this binds the power to the battery switch. This is better, but I'd like to power the RXP through the avionics switch. For other aircraft, when the avionics are off (as confirmed by the dataref), RXP is off, and when it is on (dataref==1) then RXP is on. There's something about this aircraft that's making it behave differently...