The FC-50 is a bidirectional range extender for RS-232 signals. The unit accepts an RS-232 signal that is converted to a twisted pair signal and sent to a second FC-50 that converts the twisted pair signal back into an RS-232 signal.Ports – 1 RS-232 on a 9-pin D-sub connector, 1 CAT 5 on an RJ-45 connectorBidirectional RS-232 OperationMode Selection – Select whether the RS-232 port is connected to a PC or to a controlled device