1 、 Mini-size, DB9 connecter,
2 、 Compatible with RS-232, RS-485 TIA/EIA standards
3 、 Automatical receive/transmit data, no need external
　　 direction control signal (RTS)
4 、 Power supply: Unique serial port electric charge pump
　　 driving technology, no need external power,
5 、 Real three line (TD, RD, GND) mode communication,
　　 no need serial port initialization
6 、 Connect up to 32 network devices
7 、 Communication distance: 1200m
8 、 Transmission speed: 300~115.2K BPS
9 、 Transmission media: twisted-pair cable or shielded cable
10 、Working mode: support both asynchronous half duplex
　　 (RS-485) and full duplex (RS-422),no need cable jump setting