BECKHOFF CX50x0 - Manual (Page 38)

Notes on the documentation
36 CX50x0 - Hardware Documentation
RS422/RS485 connections (CX50x0-N031)
The CX50x0-N030 system interface provides an RS422 or RS 485 interface, COM1 (X300). It is implemented on a 9-
pole Sub-D socket strip. If more than one interface is required the system can be extended via the Terminal Bus (K-
or E-bus) or Bus Terminals (KL/EL6021) which provide serial interfaces. The pin assignment is shown at the bottom
of the page.
The maximum baud rate on both channels is 115 kbit. The interface parameters are set via the operating system or
from the PLC program.
COM interface (socket)
Pin assignment of the COM interface
PIN
Signal Typ Beschreibung
2 TxD+ Data-Out + Transmit 422
3 TxD+ Data-In + Receive 422
5 GND Ground Ground
6 VCC VCC +5V
7 TxD- Data-Out - Transmit 422
8 TxD+ Data-In - Receive 422
For RS 485 pins 2 and 3 (data +) must be connected, and pins 7 and 8 (data -).
Setting of interface parameter
RS485, without echo, end-point (termination) default setting
Function
Status
Echo on Off
Echo off On
Auto send on On
Always send on Off
Auto receive on On
Alway receive on Off
Term on On
Term on On
Note Change the parameter
If there is a need for other settings please contact our service department.