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The serial port on the X9D has inverters so provides RS232 compatibility. The power pin is also battery voltage. The connections on the QX7 are non-inverted, and the power pin is 3.3V. Mike Thank you very much for the answer. Sounds like it could still be useful for hooking up something a bit more ...

Sorry to be a little off topic but the pins that i've seen you guys solder the bluetooth modules to are those just regular UART pins that you could theoretically connect to and read data from. Like the serial port on the x9d