BECKHOFF CX1000 - Manual (Page 22)

Product Overview
20 Embedded PC
CX1000-N002 connections
The CX1000-N002 system interface features two RS232 interfaces, COM2 and COM3 (9 pin Sub-D plug connector).
The maximum baud rate on both channels is 115 kBit.
RS232 COM interface (connector):
Pin assignment of the COM2 interface:
PIN Signal Type Description
2 RxD Signal in Receive Data
3 TxD Signal out Transmit Data
4 DTR Signal out Data Terminal Ready
5 GND Ground Ground
The pins not listed are not used.
Pin assignment of the COM3 interface:
PIN Signal Type Description
2 RxD Signal in Receive Data
3 TxD Signal out Transmit Data
5 GND Ground Ground
The pins not listed are not used.