### C1 - Serial Communication RS232

Pin No. | Function
1 | Shield
2 | REC (RXD) (RS232)
3 | XMIT (TXD) (RS232)
4 | Reserved (do not connect)
5 | Common
6 | TxD+ (RS485)
7 | TxD- (RS485)
8 | RxD+ (RS485)
9 | RxD- (RS485)

App Notes:

> Serial Communication Protocol
> Terminal Emulation Program sample program of how to create a terminal emulation program.

White Papers:

> RS485 Diagram for half and full duplex
> How to convert USB to RS232