Error Processing; Error Codes; Special Cases - DigiTrace TCONTROL-CONT-03 Bedienungsanleitung

2 Protocol description
2.9

Error processing

Error codes

The following error codes exist:
Response in
Slave
the
address
event of an
1 byte
error
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.
18
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1 invalid function
2 invalid parameter address or too many words
are to be read or written
8 write access to parameter denied
Function
XX OR 80h
1 byte
03 40 00 00
83 02 CRC16
Error code Checksum
CRC16
1 byte 2 bytes
04 CRC16