Features: 1.RS232 to RS485 RS422: This converter is compatible with RS232/RS485/RS422, and can convert the single end RS232 signal to the balanced differential RS422 or RS485 signal. The converter can extend the communication distance of RS232 to 1.8km. 2.1500W Surge Protection: This RS232 to RS422 converter provides 1500W surge protection, which ensures stable and reliable performance. 3.High Speed: This RS232 to RS422 RS485 converter provides 300 to 115.2KBPS transmission and 0 to 1.8KM transmission distance. 4.32 to 128 Devices: This RS232 to RS485 serial converter supports 32 to 128 devices cascade connection. Interface is compatible with RS232C, RS485/RS422 standard of EIA/TIA. 5.Data Communication: This RS232 to RS485 RS422 converter supports point to point/point to multilpoint 4 wire full duplex, point to point/point to multilpoint 2 wire half duplex. specification:Item Type: RS232 to RS485 Converter Material: Metal Interface Interface Compatible with RS232C, RS485/RS422 Standard of EIA/TIA. Electrical Interface: RS 232C Interface DB9 Hole Connector, RS485/RS422 Interface DB89 Female Connector and RJ45 Connector, Equipped with 6 Position Terminals. Transmission Medium: Twisted Pair Shielded Wire Working Mode: Asynchronous Duplex or Asynchronous Half Duplex. Signal Indicator: 3 Signal Indicators TXD, RXD, POWER. Protection Grade: 1500W Surge Protection Transmission Rate: 300 to 115.2KBPS Transmission Distance: 0 to 1.8KM Product Size: Approx. 93 x 62 x 23mm / 3.7 x 2.4 x 0.9in ( Manual Measurement, Slight Error May Exist ) Operating Environment: 0 to 50, Relative Humidity of 5% to 95% Cascade Connection: 32 to 128 Devices. PackageList:1 x RS232 to RS485 Converter 1 x Power Adapter 1 x User Manual 1 x Cable 1 x Terminal