In addition to the dual RJ-45 Ethernet port, the GE Fanuc IC698CRE030 Pentium-M redundancy CPU also has another Ethernet port which is an RS-232 serial port used for station management and 2 other serial ports that are used for RS-232 communication and RS-485 communication. All 3 of these serial ports are isolated. The RS-232 communication port has an indicator LED for the status of the port’s activity and its connector type is a female 9-pin D-sub connector. This port is also known as a DCE or a Data Communications Equipment port that only requires a straight-through cable to make connections. The RS-485 communication port on the IC698CRE030 CPU is also a DCE port, but it needs shielded cables for its connections. The station manager port uses straight-through cable for RS-232 connections just like the ordinary RS-232 cable.