Basic Principles Of Serial Data Transmission; Serial Transmission Of A Character - Siemens Simatic S7-300 CP 341 User Manual

Basic Principles of Serial Data Transmission

2.1

Serial Transmission of a Character

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 connection
With the point-to-point connection, the communication processor forms the interface
between a programmable controller and a communication partner. The data is transmitted
serially in the point-to-point connection with the communication processor.
Serial data transmission
In serial data transmission, the individual bits of each byte of information to be transmitted
are transmitted one after the other in a fixed order.
Drivers for uni/bidirectional data traffic
The CP 341 itself handles data transmission with the communication partner via its serial
interface. The CP 341 is equipped with three different drivers for this purpose.
Unidirectional data traffic:
● Printer driver
Bidirectional data traffic:
● ASCII driver
● 3964(R) procedure
● RK 512 computer link
The CP 341 handles the data transmission via the serial interface in accordance with the
interface type and the selected driver.
Unidirectional data traffic - printer output
In the case of printer output (printer driver), n bytes of user data is output to a printer. No
characters are received. The only exception to this are individual data flow control characters
(e.g., XON/XOFF).
CP 341 Point-to-Point Communication, Installation and Parameter Assignment
Manual, 09/2008, A5E02191071-01
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