This modular adapter has a DB9 female connector that plugs into DB9 RS232 serial port and converts it to an RJ11 or RJ12 connection. Our modular adapters give you an easy way to adapt connection styles. Designed with all the popular RJ12 style jacks and D-Sub connectors, this series offers UL94V-0 protection in a sleek dark gray case with thumbscrews. RJ12 Pin out: Pin1 - White, Pin2 - Black, Pin3 - Red, Pin4 - Green, Pin5 - Yellow, Pin6 - Brown