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2
Protocol description
2.9
Error processing
Error codes
The following error codes exist:
1
2
8
Response in the event of an error
Slave
address
1 byte
0x80 is used to set the function code to its OR status, i.e. the MSB (most significant bit)
is set to 1.
Example
Data request:
01
Response (with error code 2):
01
Special cases
The slave not responding can have the following causes:
- the baud rate and/or data format of Master and Slave are not compatible
- the device address used does not coincide with that of the slave address
- the checksum (CRC16) is not correct
- the instruction from the Master is incomplete or over-defined
- The number of words to be read is zero.
In these cases the data request should be transmitted again once the timeout time (2 s)
has elapsed.
16 | nVent.com
invalid function
invalid parameter address or too many words
are to be read or written
write access to parameter denied
Function
XX OR 80h
Error code
1 byte
1 byte
03
40
83
02
Checksum
CRC16
2 bytes
00
00
CRC16
04
CRC16
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