The ICF-1150 series serial media converters support 2 serial ports with a DB9 connector for RS232 communication and a removable terminal block for RS422/RS485 connections. The 3 ports (2 serial ports and one fibre port) are completely independent. When an ICF-1150 converter receives data from any one port, it will send the data out through the other 2 ports. This unique product also allows the user to tune the pull high/low resistor via a rotary switch for reliable RS485 communications.