Feature
1.   Exquisite mini-sized with DB9 connector and wiring post connector.
2.   Compatible with RS-232 and RS-485、RS-422 standards of EIA/TIA.
3.   Automatic data transceiver without external volume control signal (RTS).
4.   Power supply Unique adoption of serial charge pump without external power supply, and three-line (TXD, RXD and GND) communication
5.   Without necessity for initialization of the serial ports to obtain power supply.
6.   A maximum connection of 32 pieces of network devices.
7.   Communication distance: 1.2 KM
8.   Communication rate: 300BPS-115.2KBPS
9.   Transmission media: twisted-pair cable or shielded cable.
10.  Working modes: applicable for both asynchronous half duplex (RS-485) and asynchronous full duplex (RS-422) without any jumper settings needed.
11.  Plug-and-play and universally applicable on all the existing communication software.
12.  Dimensions: 63mm×33mm×17mm.
13.  Working environment: -25℃ to 70℃, relative humidity 5% to 95%.
14.  Supporting DOS/WIN95/WIN98/WIN2000/NT/XP and Linux, etc.