Beckhoff CX2500-0030, Manual

Page: 17 / 28

Mounting and wiring
CX2500-0030 17 Version: 1.1
3.6 CX2500-0030 connections
The CX2500-0030 system interface provides two RS232 interfaces. The interfaces are arranged on a 9-pole
Sub-D pin contact strip. Up to 4 interfaces can be attached. This means that up to 9 serial interfaces (four
CX2500-0030 modules and the optional CX20x0-N030 interface) can be connected to the CX20x0 system.
The system shows the optional CX20x0-N030 interface as COM1. The pin assignment of all connectors is
identical and is shown below at the side.
The maximum baud rate on both channels is 128 kbit. The interface parameters are set via the operating
system or from the PLC program.
RS232 COM interface (connector) /( X300, X301
Table 1: 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
In the operating system the interfaces are numbered from right to left (starting from the CPU) and from top to
bottom (i.e. X301 -> COM n and X300 -> COM n+1 for n ={ 3, 5, 7, 9}):
If the interfaces configuration is changed, the numbering of the interfaces changes. To obtain unique
interface numbering, we recommend to delete the interfaces manually from the Device Manager.