Description of the interfaces
CX51x0
25
Version: 1.9
5.4.5
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. 15: 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 17: 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 18: 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.
Limited driver support
The driver manufacturer does not support all standard functions for the interface. As a result, some
applications may not run properly under Windows.
The following API and IOCTLs are not supported:
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