The DIN-191 module transparently converts RS232 signals to those required by RS485 at all standard baud rates from 300 to 115.2K baud. Internal control circuitry automatically controls the flow of data on the RS485 bus. Therefore, the DIN-191 does not require external handshaking signals.  

The DIN-191 is optically isolated from the RS232 input to the RS485 output by up to 500VAC and contains internal biasing and termination resistors for the RS485 bus.