Siemens SIMATIC S7-400 CP 440 - Figure 2-1 10-Bit Character Frame

Basic Principles of Serial Data Transmission
2.1 Serial Transmission of a Character
Point-to-point connection CP 440 Installation and Parameter Assignment
Manual, 09/2007, A5E00057742-03
23
Character frame
Data is transmitted between the CP 440 and a communication partner via the serial interface
in a character frame. Two data formats are available for each character frame. 7 data bits
without a parity bit are not supported. You can set the desired format for data transmission
with the programming interface CP 440: Point-to-Point Communication, Parameter
Assignment interface.
By way of example, the figure below shows the two data formats of the 10-bit character
frame.


GDWDELWVVWDUWELWGDWDELWVSDULW\ELWVWRSELW
GDWDELWVVWDUWELWGDWDELWVVWRSELW
6LJQDOVWDWHಯರ
6LJQDOVWDWHಯರ
6LJQDOVWDWHಯರ
6LJQDOVWDWHಯರ
VWDUWELW
GDWDELWV
SDULW\ELW
VWRSELW
VWDUWEL
GDWDELWV
VWRSELW
Figure 2-1 10-Bit Character Frame
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