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1. Request message (user board -> module)
Byte
Description
0
message length includes all following bytes except the check sum byte , high-byte first
1
2
Input data, high-byte first
…
n
n+1
Check sum, byte 0+byte 1+…+byte n
2. Response message of SST Automation-defined protocol (module -> user board)
Byte
Correct response
Byte
Incorrect response
0
message length includes all following bytes except the
check sum byte , high-byte first
0
0x80
1
1
Data length is2
2
Output data, high-byte first
2
Error code
…
3
Extra error code
n
4
Check sum, byte 0+byte
1+byte 2+byte3
n+1
Check sum, byte 0+byte 1+…+byte n
3. Error code
