1 、 Interface feature: Compatible Interface with EIA/TIA RS-232C,
　　 RS- 422/485 standard
2 、 Electric interface: RS-232C interface DB9 hole-type connector,
　　 RS-422/485 interface 4-bit terminal
3 、 Transmission media: twisted-pair cable or shielded cable
4 、 Working mode: asynchronous half or full duplex
5 、 Signal indication: three signal indication lights indicating TD,
　　 RD and PWR
6 、 Power supply: serial port electricity stealing at RS-232 end.
　　 External power supply connecting at RS-422/485 end
7 、 Isolation: isolation voltage 3500VRMS 500VDC sequence special
　　 built-in 400W lightning protection IC
8 、 Transmission speed: 115.2K BPS to 1.2KM 38.4K BPS to 2.4KM