====== Aircraft Instrument Troubleshooting ======

===Testing RS422===
  * Should see between 2-6 volts transmitting from the instrument 


 For the CDP Pin Out:
  * Pin 1 (A) = TxD+
  * Pin 2 (B) = TxD-
  * Pin 3 (C) = RxD+
  * Pin 4 (D) = RxD-
  * Pin 5 (E) = RxD shield

For the WCM 3000 Pin Out:
  * Pin 1 = RxD+
  * Pin 2 = TxD+
  * Pin 3 = TxD-
  * Pin 4 = RxD-