Modbus communication data problems

Question

Sneha Cheruvattath 2017-7-5

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/347538-modbus-communication-data-problems

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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Answer 1

Nagarjuna Manchineni 2017-7-17

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/347538-modbus-communication-data-problems#answer_274500

编辑：Walter Roberson 2017-7-17

在 MATLAB Online 中打开

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!