User Manual

Chapter 3. Hardware Description
◆ 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
◆ RS422 Full Duplex
Pin Signal Description
2 RXD+ Receive differential data positive (Input)
3 TXD+ Transmit differential data positive (Output)
6 RXD- Receive differential data negative (input)
7 TXD- Transmit differential data negative (Output)
◆ LED
LED Signal Description
1 GPIO0 Programmable I/O 1 (user-defined I/O)
2 GPIO1 Programmable I/O 2 (user-defined I/O)
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