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Basic Principles of Serial Data Transmission

2.1 Serial Transmission of a Character

PtP coupling and configuration of CP 340

Manual, 04/2011, A5E00369892-03

Character frame

Data is transmitted between the CP 340 and a communication partner via the serial interface

in a 10-bit or 11-bit character frame. Three data formats are available for each character

frame. You can assign parameters to the format you require using the CP 340: Point-to-Point

Communication, Parameter Assignment parameterization interface.

10-Bit Character Frame

The figure below shows the three possible data formats for an 10-bit character frame.

6LJQDOVWDWXV

VWDUWELW

GDWDELWV

VWRSELWV

VWDUWELW

GDWDELWV

SDULW\ELW

VWRSELWVWRSELW

VWDUWELW

GDWDELWV

GDWDELWVVWDUWELWGDWDELWVVWRSELW

6LJQDOVWDWXV

GDWDELWVVWDUWELWGDWDELWVSDULW\ELWVWRSELW

6LJQDOVWDWXV

GDWDELWVVWDUWELWGDWDELWVVWRSELW

6LJQDOVWDWXV

12 8910

12 910

Figure 2-1 10-Bit Character Frame

Siemens SIMATIC CP 340 User Manual

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