Quantity=126,modbus-response , not recieve data

Quantity=126,modbus-response , not recieve data
I want to recive Quantity 200 length, but it does not work due to me not understanding how to use it effectively. Quantity=124 it working. why ?

work: 1-125
not work: 126-x

Its a limitation with the Modbus protocol ..
the maximum amount of bytes that you can read in a single poll (256 bytes) ..
this article explains better the byte calculations to derive to max 125 registers.

You can group your registers and do multiple sequential reads to gather all the data you need.

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