The RS232<->RS485 converter allows to interface any device using an RS232 serial link to an RS485 link. It convert the RS232 RX and TX signals to two-wires balanced half-duplex RS485 signals. No external power supply require, it directly stealing from the RS232 signals.
It is widely used in industrial automation and control systems, card access system, parking system, etc...
* Note : The converter is NOT optoisolated