2 Protocol description
14
2.6
Error handling
Error codes
There are three error codes:
1
invalid function
2
invalid parameter address
4
device not ready
8
write access to parameter denied
Response in
the event of
an error
The function code is ORed with 0x80, which means that the MSB (most
significant bit) is set to 1.
Example
Data request:
Response:
Special cases
The slave will not respond if one of the following errors occurs:
- the checksum (CRC16) is not correct
- the instruction from the master is incomplete or over-defined
- the number of words or bits to be read is zero
Slave
address
Function
XX OR 80h
Error code
Checksum
CRC16
1 byte
1 byte
1 byte
2 bytes
01
03
40
00
00
04
CRC16
01
83
02
CRC16
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