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ModBusClient.ReadHoldingRegisters - Amount #45

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faber33 opened this issue Oct 27, 2020 · 1 comment
Open

ModBusClient.ReadHoldingRegisters - Amount #45

faber33 opened this issue Oct 27, 2020 · 1 comment

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@faber33
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faber33 commented Oct 27, 2020 •
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Hi. How many registers can be read at once?

So far I can read up to 126 registers. Is this a limit or a bug in my program?
@plpolak
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plpolak commented Oct 28, 2020

According to the Modbus specification, there is a limit of 126 registers when reading the hold registers. Unfortunately the protocol specifies the amount in a word, suggesting it is possible to read more in one go.

Modbus protocol specification

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@plpolak @faber33