1)Can prolong the communication distance of RS-422/RS-485 bus network 2)Increase the number of RS422/RS485 bus network device Product features:  Can prolong the communication distance of RS-422/RS-485 bus network Increase the number of RS422/RS485 bus network device  Automatic data direction control, zero-latency design  Photoelectric isolator and DC/DC module, can offer 3500V isolation voltage and effectively prevent lightning strike and common code interference High efficiency lightning protection tube can effectively inhibit lightning and ESD, and offer 1000W lightning strike & surge protection power on each line.  Can greatly enhance the credibility of the whole RS-422/RS-485 network Full metal housing, anti-static, powerful anti-jamming capacityApplication fields:  Point to point, point to multi-point communication Industrial distribution system, industrial control automation Road traffic control automation Closed circuit monitoring Security protection system Intelligent card, check on work attendance gate safety system