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2
Protocol description
2.5
Structure of the data blocks
All data blocks have the same structure:
Data structure
Slave
address
1 byte
Each data block contains four fields:
Slave address
Function code
Data field
Checksum
Function
code
1 byte
device address of a specific slave
function selection (read, write words)
contains the following information:
- word address
- number of words
- word value(s)
detection of transmission errors
Data field
x byte
Checksum
CRC16
2 bytes
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