Siemens SIMATIC CP 340 - Page 26

Basic Principles of Serial Data Transmission
2.1 Serial Transmission of a Character
PtP coupling and configuration of CP 340
26 Manual, 04/2011, A5E00369892-03
11-Bit Character Frame
The figure below shows the three possible data formats for an 11-bit character frame.
6LJQDOVWDWXV
6LJQDOVWDWXV
6LJQDOVWDWXV
VWDUWELW
GDWDELWV
SDULW\ELW
VWRSELWV
VWDUWELW
GDWDELWV
SDULW\ELW
VWRSELW
VWDUWELW
GDWDELWV
VWRSELWV
GDWDELWVVWDUWELWGDWDELWVSDULW\ELWVWRSELWV
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 891011
12 91011
12 9 1110
Figure 2-2 11-Bit Character Frame