How do I install the Modbus option board into my XNX transmitter?

First, remove power from the XNX unit and use a 2mm hex key to unscrew the cover. Slide out the POD, place it face-down on a flat surface, remove the back cover, and insert the option board pins into the connector on the main board. Reassemble the POD, apply anti-seize compound to the threads, and reinstall it into the housing.