
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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