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A.4 MODBUS exceptions codes
Exception mode
B. Annexe ASCII Protocol
Default RS485 configuration for Ascii protocol :
128'000bauds
8 bits
Even parity
1 stop
Final CR
B.1 ASCII transactions
The master issues an ASCII Command frame on the bus. The addressed slave may or may not answer, depending of the Command.
01
02
03
04
Description
Illegal function
Illegal address
Illegal data
Slave failure
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