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How to read data from MX eco drive over modbus RTU?

Article available in these languages: Czech

MX drives are totally different than ATVs. See modbus manual for MX eco drives in attachment. Page 6 shows all important information and page 16 example with function code 17. If you want only to read parameters from MXeco, (not sending commands), then use funcion code 3 - read holding registers

The modus request will look: (each byte separated by "-")
Slave address - 16#03 - 16#00 - 16#FA - 16#00 - 16#02 - CRCLow - CRCHi

16#00FA is the address of status word ZTW and 16#0002 means that 2 words will be read:
ZTW (stauts word) from address 16#00FA
Fact (actual frequency) from address 16#00FB

If you need to read more data, use another request.
Full request and response with function code 3 shown on page 32


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