BECKHOFF CX2500­0031 - Manual (Page 16)

Mounting and wiring
3.6 Connections CX2500­0031
The CX2500­0031 system interface features two RS422 / RS 485 interfaces. The interfaces are realized via
two 9 pin Sub­D plug connectors (X310 and X310). If there is need for more than two serial interfaces up to
four modules further RS422 / RS485 interfaces can be added to the system. Thus 9 serial interfaces (four
CX2500­0031 modules and the optional interface CX20x0­N031) can be added to the CX20x0 system. The
optional interface CX20x0­N031 is shown in the system as COM1. The pin assignment for all interfaces is
equal and described below.
The maximum baud rate on both channels is 128 kBit. The interface parameter can be set in the operating
system or in the PLC program.
COM Interface RS485/RS422 (connector) (X310, X311)
Table 1: Pin assignment COM interface:
PIN Signal Type Description
2 TxD+ Data­Out + Transmit 422
3 RxD+ Data­In + Receive 422
5 GND Ground Ground
6 VCC VCC +5V
7 TxD­ Data­Out ­ Transmit 422
8 RxD­ Data­In ­ Receive 42
For RS 485 Pin 2 and 3 (Data +) as well as Pin7 and 8 (Data ­) have to be connected.
CX2500­0031 16 Version 1.1