• 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-