Siemens SIMATIC S7-400 CP 440 User Manual

Name: Siemens SIMATIC S7-400 CP 440
Brand: Siemens
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Basic Principles of Serial Data Transmission

2.4 Data Transmission with the ASCII Driver

Point-to-point connection CP 440 Installation and Parameter Assignment

Manual, 09/2007, A5E00057742-03

RS422 Operation

In the case of a master/slave topology in RS422 operation:

● The master's sender is interconnected with the receivers of all the slaves.

● The slaves' senders are interconnected with the master's receiver.

● Only the receiver of the master and the receiver of one slave have a default setting. All

the other slaves function without default settings.

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Figure 2-10 RS 422 Multipoint

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