User Manual

Chapter 3. Hardware Description
◆ DB9
Serial Connector
◆ RS232
Pin Signal Description
1 DCD Data Carrier Detection (Input)
2 RXD Receive Data (Input)
3 TXD Transmit Data (Output)
4 DTR Data Terminal Ready (Output)
5 GND Ground
6 DSR Data Set Ready (input)
7 RTS Request to Send (Output)
8 CTS Clear to Send (Input)
9 RI Ring Indicator (Input)
◆ RS485 Half Duplex
Pin Signal Description
3 TRX+ Transmit/Receive differential data positive
7 TRX- Transmit/Receive differential data negative
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