Point-to-point connection CP 440 Installation and Parameter Assignment
Manual, 09/2007, A5E00057742-03
21
Basic Principles of Serial Data Transmission
2
2.1 Serial Transmission of a Character
Introduction
The system provides various networking options for the exchange of data between two or
more communication partners. The simplest form of data interchange is via a point-to-point
connection between two communication partners.
Point-to-Point Communication
In point-to-point communication the communication processor forms the interface between a
programmable controller and a communication partner. In PtP communication with
communication processor, data are transferred via serial interface.
Serial Transmission
In serial transmission, the individual bits of each byte of information are transmitted one after
the other in a fixed order.
Drivers for Bidirectional Data Traffic
The CP 440 itself handles data transmission with communication partners via its serial
interface. The CP 440 is equipped with two different drivers for this purpose.
Bidirectional data traffic:
● ASCII driver
● 3964(R) Procedure
The CP 440 executes data transfer via the serial interface depending on the selected driver.
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