Connecting your PC Directly to the Express Messenger Card
1. Plug one end of the custom RS-232 cable into an unused COM port on
the PC.
2. Plug the other end of the cable into the Express Messenger card
connector. You must open the PBX door to connect the cable.
The custom RS-232 cable is a PC-to-PC cable with 9-pin female DB9
connectors on each end. Wires between pines 1 and 4 and between 2
and 3 of the connectors cross over within the cable; that is, it is a null
modem cable.