Beckhoff CX20 2 Series, Руководство пользователя

Страница: 25 / 77

Description of the interfaces
CX20x2 25 Version: 1.7
5.4.4 RS422/RS485 (N031)
The optional N031 interface provides an RS422 or RS485 interface (X300). The interface is implemented on
a 9-pin D-sub connector.
Fig. 14: RS485 interface X300 with pin numbering.
The maximum baud rate on both channels is 115 kbit. The interface parameters are set via the operating
system or from the PLC program.
Table 16: RS422/485 interface, pin assignment.
PIN Signal Type Description
2 TxD+ Data-Out + Transmit 422
3 RxD+ Data-In + Receive 422
5 GND Ground Ground
6 VCC VCC +5 V
7 TxD- Data-Out - Transmit 422
8 RxD- Data-In - Receive 422
For RS485 pins 2 and 3 (data +) must be connected, and pins 7 and 8 (data –).
By default the interface is parameterized as follows on delivery:
Table 17: Default setting, RS485 without echo with end point (terminated).
Function Status
Echo on off
Echo off on
Auto send on on
Always send on off
Auto receive on on
Always receive on off
Term on on
Term on On
Other configurations for the RS485 interface
Other configurations for the RS485 interface can be ordered ex factory. The following options are available:
• N031-0001 RS485 with echo, end point (terminated).
• N031-0002 RS485 without echo, stub (without termination).
• N031-0003 RS485 with echo, stub (without termination).
• N031-0004 RS422 full duplex end point (terminated).
An RS485 interface cannot be configured retrospectively and must always be ordered ex factory as required.