Rs422/Rs485 Connections (Cx50X0-N031) - Beckhoff CX50 0 Series Hardware Documentation

3.10

RS422/RS485 connections (CX50x0-N031)

The CX50x0-N031 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)
Table 6: Pin assignment of the COM interface
PIN
2
3
5
6
7
8
For RS 485 pins 2 and 3 (data +) must be connected, and pins 7 and 8 (data -).
Parameter setting of the interface
The interface is parameterized as follows:
Table 7: RS485 without Echo, End-Point (Termination) default setting
Function
Echo on
Echo off
Auto send on
Always send on
Auto receive on
Always receive on
Term on
Term on
Other parameters
If there are other parameters needed, please contact your local service department.
CX50x0
Signal
TxD+
RxD+
GND
VCC
TxD-
RxD-
Version: 1.9
Typ
Data-Out +
Data-In +
Ground
VCC
Data-Out -
Data-In -
State
Assembly and connecting
Description
Transmit 422
Receive 422
Ground
+5V
Transmit 422
Receive 422
off
on
on
off
on
off
on
on
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