USING COMPASS WITH A USB TO SERIAL CONVERTER THIS DOC USES THE BELKIN F5U103 USB SERIAL ADAPTER ONLY THE BELKIN F5U103 will only work, using a direct connect with the 4100SM. ADEMCO has been unable to test and pass this unit when using with a serial modem. Secondly, Ademco will only advise to how this process should work, and be wired. ADEMCO does not, guarantee, USB to SERIAL devices to be fully functional. The drivers for this device, emulate a COM port, as seen below (NOTICE: FOR USE WITH COMPASS YOU MUST EMULATE ONLY THE FOLLOWING COM PORTS (1,2,3,or 4). Notice, that the drivers installed, are now emulating a COM 3.Once emulation, does take place, assign a modem in COMPASS to the COM port being emulated, and follow the direct connect instructions from here.