1. Serial port characteristics: The interface is compatible with EIA/TIA''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s RS-232C and RS-485 standards.
2. Electrical interface: RS-232 end DB9 hole type side interface, RS-485 end DB9 pin type connector, with terminal(Five-position wiring).
3. Working mode: Asynchronous half-duplex.
4. Transmission medium: ordinary wire, twisted pair or shielded wire.
5. Transmission rate: 300~11.52K baud rate.
6. Transmission distance: 5 meters(RS-232 terminal)1.200 meters (RS-485 end).
7. Communication protocol: transparent.
8. Working environment: -10℃ to 85℃, relative humidity is 5% to 95%.
9. Signal: RS-232: TXD, RXD, RTS, CTS, DTR, DSR, DCD, CND; RS-485: Date+, Date-. GND