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Appendix
A.2 Modbus RTU
SENTRON PAC3100
126
Manual, 07/2009, A5E02385159B-01
A.2.2
Character frame
The MODBUS RTU specification defines the data format. The user can change the data
format.
Structure of the character frame
The data is transferred between the SENTRON PAC Power Monitoring Device and the
MODBUS master via the serial interface in an 11-bit character frame. In exceptional cases,
only 10 bits are used.
GDWDELWVVWDUWELWGDWDELWVSDULW\ELWVWRSELW
6LJQDOVWDWXV
6LJQDOVWDWXV
6LJQDOVWDWXV
6LJQDOVWDWXV
GDWDELWVVWDUWELWGDWDELWVVWRSELWV
V
WD
UWE
LW
S
D
UL
W\E
LW
GDWDELWV
V
WR
SE
LW
V
WD
UWE
LW
GDWDELWV
V
WR
SE
LW
V
Figure A-1
11-bit character frame
6LJQDOVWDWXV
6LJQDOVWDWXV
GDWDELWVVWDUWELWGDWDELWVVWRSELW
V
WD
UWE
LW
GDWDELWV
V
WR
SE
LW
Figure A-2
10-bit character frame
The least significant bit (LSB) is sent at the start of the eight data bits, and the most
significant bit (MSB) is sent at the end.
Summary of Contents for SENTRON PAC3100
Page 10: ...Table of contents SENTRON PAC3100 10 Manual 07 2009 A5E02385159B 01 ...
Page 38: ...Mounting 5 3 Deinstallation SENTRON PAC3100 38 Manual 07 2009 A5E02385159B 01 ...
Page 104: ...Service and maintenance 10 5 Disposal SENTRON PAC3100 104 Manual 07 2009 A5E02385159B 01 ...
Page 118: ...Dimensional drawings SENTRON PAC3100 118 Manual 07 2009 A5E02385159B 01 ...
Page 142: ...Appendix A 3 Correction sheet SENTRON PAC3100 142 Manual 07 2009 A5E02385159B 01 ...
Page 146: ...List of abbreviations C 1 Abbreviations SENTRON PAC3100 146 Manual 07 2009 A5E02385159B 01 ...
Page 148: ...Glossary SENTRON PAC3100 148 Manual 07 2009 A5E02385159B 01 ...
Page 152: ...Index SENTRON PAC3100 Manual 07 2009 A5E02385159B 01 152 ...