Hi, I'm trying to read the Modbus protocol via RTU from a ventilation system but the bus response with checksum error.
Can it be that the protocol does not correspond to the standard?
Modbus RTU
Communication Settings:
9600 baud
8 data bits
No parity
1 stop bit
Supported Functions:
Request:
Byte 0 : FC = 0x3
Byte 1-2: Address
Byte 3-4 : Number
Response:
Byte 0 : FC = 0x3
Byte 1 : Number of bytes
Byte 2-n: Values
Exceptions:
Byte 0 : FC = 0x83
Byte 1 : 0x02 (Illegal adres)
With which software could this dialect be read out? The aim would be to process it with codesys.
Thx!
Can it be that the protocol does not correspond to the standard?
Modbus RTU
Communication Settings:
9600 baud
8 data bits
No parity
1 stop bit
Supported Functions:
Request:
Byte 0 : FC = 0x3
Byte 1-2: Address
Byte 3-4 : Number
Response:
Byte 0 : FC = 0x3
Byte 1 : Number of bytes
Byte 2-n: Values
Exceptions:
Byte 0 : FC = 0x83
Byte 1 : 0x02 (Illegal adres)
With which software could this dialect be read out? The aim would be to process it with codesys.
Thx!
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