What is the pin out of the communications port on the 2231A-30-3?  

Below is the pin out of the connector.

Pin 1 = +5V

Pin 2 = RXD

Pin 3 = TXD

Pin 4 = NC

Pin 5 = GND

Pin 6 = NC

Pin 7 = NC

Pin 8 = NC

Pin 9 = NC

Note: To use this communications port, it requires the Model 2231A-001 USB adapter to communicate to a PC.