anyone had any success with VX Pro II mobo boards and using the IrDA port and s/w IRAssistant?

Cant seem to use the onboard IrDA port (seems to be a non-standard 7 port connector - RD(Lo), GND, TD, +5, RD(Hi), +5, GND). Anyone know what the difference between RD(Lo) RD(Hi) is ??

Thanks in advance