Module T3-485-1 can change TXD and RXS signal data of RS232 serial interface to twisted pair RS485. The unti-scavenges power is from the RS232 lines so there is no need for an external power source. Pin3 (TXD) , Pin7 (RTS) and Pin4 (DTR) provide enough power. Auto flow control means you don’t have to install special drivers. The cable provided connects to most Temco controls equipment directly. It can be easily cut and customized in the field or write to us and we’ll make a custom version for you at no extra charge.