Modbus communication data problems

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Sneha Cheruvattath
编辑： Walter Roberson 2017-7-17
I am working on using modbus TCP to remotely read data. Each data value is obtained in the form of 4 registers. However, while running the code, instead of getting one value in the 4 registers, I seem to be getting the value of the next data as well. How can I rectify this? I am including a copy of the code:
test=read(t,'inputregs',1,4,'uint32')
test =
1.0e+09 *
1.0454 0 1.0446 0
>> test1=uint32(test)
test1 =
1×4 uint32 row vector
1045374906 0 1044558328 0
>> typecast(test1,'single')
ans =
1×4 single row vector
0.2023 0 0.1901 0

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回答（1 个）

Nagarjuna Manchineni
编辑：Walter Roberson 2017-7-17
The command
test=read(t,'inputregs',1,4,'uint32')
reads 4 registers starting from 1 in 'uint32' format. I believe you would like to read a single register value in 'single' precision. For achieving the same you can use the following command:
test = read(t, 'inputregs', 1, 1, 'single'); % If you want to read second register value update the third argument (address from where the value is being read) with value 2
Refer the following link for more information:
https://www.mathworks.com/help/instrument/read-data-from-a-modbus-server.html#bvnhuw0
I hope this helps!

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