Anyone well versed with modbus rtu? I'm trying to read

Question

Anyone well versed with modbus rtu? I'm trying to read

holding registers from a pH controller. And the address starts from 0x0000 till 0x0072 .

Well I can read all the registers from 0x0000 till 0x0063, but from 0x0064 till 0x0072 I get only a number that is 65535.

Can someone help me with this issue ?

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30.01.2019

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Gustavo Fernandes de Carvalho · Accepted Answer

Gustavo Fernandes de Carvalho

little to no info here. Assuming you didn't develop a library from scratch, your problem might be found at the pH controller datasheet/manual. Some of the suppliers set an offset (something like 0x9c40) and put addresses from 0x000 - 0x0072 (but actually the range would be 0x9c40-0x9cb2), so actually reading fully the manual might help. Usually, this info goes on the footnotes

0

30.01.2019

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Anyone well versed with modbus rtu? I'm trying to read

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