Basic Principles of Serial Data Transmission
2.4 Data Transmission with the ASCII Driver
Point-to-point connection CP 440 Installation and Parameter Assignment
42 Manual, 09/2007, A5E00057742-03
RS485 Operation
In the case of a topology in RS485 operation:
● The cable pair is interconnected for the send/receive line of all the nodes.
● Only the receiver of a node has a default setting. All the other modules function without
default settings.
0DVWHU
6ODYH
6ODYH
6ODYH
Figure 2-11 RS 485 Multipoint
The settings required for the different topologies can be made in the parameter assignment
interface in the "Interface" dialog box.
Note
When you run the ASCII driver in RS422 multipoint or RS485 mode, you must take steps in
the user program to ensure that only one node sends data at any one time. If two users send
data simultaneously, the message frame is corrupted.
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