Siemens SIMATIC TI505 Manual de usuario Pagina 36

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Modbus Commands
2-5
SIMATIC TI505/TI500 MODNIM User Manual
The
checksum needs 16 bits and uses the Cyclic Redundancy Checksum
(CRC) method. The calculation of this checksum is described in the
Modbus
Protocol Reference Manual
.
The MODNIM ignores messages that contain invalid characters. Messages
containing the following errors are also ignored.
Incorrect checksum
Parity error
Framing errors
Frame too long
Incomplete transmission
Checksum
Invalid Characters
and Messages
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