BECKHOFF CX1020 User Manual
Page 41
Product
overview
Embedded PC
39
CX1020-N030/40 connections
The CX1020-N030 system interface features two RS232 interfaces, COM1 and COM2 (9 pin Sub-D plug connector).
If there is need for more than two serial interfaces two further RS232 interfaces, COM3 and COM4 (9 pin Sub-D plug
connector) can be added to the system via the system interface CX1020-N40. The maximum baud rate on all
channels is 115 kBit. The pin assignment for all interfaces is equal and described below. The interface parameter can
be set in the operating system or in the PLC program.
RS232 COM interface (connector):
Pin assignment COM interface:
PIN
Signal
Type
Description
1
DCD
Signal in
Data Carrier Detected
2
RxD
Signal in
Receive Data
3
TxD
Signal out
Transmit Data
4
DTR
Signal out
Data Terminal Ready
5 GND
Ground
Ground
6
DSR
Signal in
Dataset Ready
7
RTS
Signal out
Request to Send
8
CTS
Signal in
Clear to Send
9
RI
Signal in
Ring Indicator
Note
The system interface CX1020-N30 can only be used instead and not simultaneously with system
interface CX1020-N031.
The system interface CX1020-N40 can only be used instead and not simultaneously with system
interface CX1020-N041.