Introductions Feature1. Compatible RS422/485 standards of EIA/TIA. 2. Automatic data transceiver without external volume control signal (RTS). 3. Great increase of the communication distance of RS-485/RS-422 BUS network and the reliability of RS-485/422 network. 4. Baud rate: 300BPS-115.2KBPS. 5. Working current:9-30VDC/350mA. 6. A maximum connection of 128 pieces of RS-485 or RS-232 interface devices. 7. Communication