Send a hex block of data Serial port from matlab

Question

Michael Mathew 2013-10-7

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https://ww2.mathworks.cn/matlabcentral/answers/89414-send-a-hex-block-of-data-serial-port-from-matlab

评论： Ferran Gonzalez 2022-11-8

Hi,

I have a problem, I have a serial device which should addressed using a block of data in specific format. The data I am trying to send is [7E 00 12 10 00 00 13 A2 00 40 8B 63 85 08 59 00 00 00 00 00 1A 0C], all in hexadecimal. How to send it in a single go? The command is correct since I am able to send the same via a serial terminal program and the device responds.

I can do the same using a arduino by the following command: Serial.write(array,sizeof(array));

How to do the same kind in matlab?

Kindly please help.

Thanks in advance, Mike

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Answer 1

Walter Roberson 2013-10-7

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https://ww2.mathworks.cn/matlabcentral/answers/89414-send-a-hex-block-of-data-serial-port-from-matlab#answer_98882

在 MATLAB Online 中打开

fwrite(fid, array)

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Walter Roberson 2013-10-8

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You do NOT want to transmit hex. You want to transmit 8 bit binary. The hex you see is from the monitoring program displaying the binary that way.

fwrite(s, h)

Have you set the serial port Terminator property to no terminator, and the BytesAvailableFcnMode to 'byte' ? And possibly the InputBufferSize as well?

Michael Mathew 2013-10-8

Thanks, it worked, plus I found some suggestions in the below link.

http://www.mathworks.in/matlabcentral/newsreader/view_thread/79757

Now the device responds.

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Answer 2

Jan 2013-10-7

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https://ww2.mathworks.cn/matlabcentral/answers/89414-send-a-hex-block-of-data-serial-port-from-matlab#answer_98890

在 MATLAB Online 中打开

"All in hexadecimal" is not clear. You cannot store values in hexadecimal format like e.g.:

a =  [7E 00 12 10 00 00 13 A2 00 40 8B 63 85 08 59 00 00 00 00 00 1A 0C];  % ERROR!

You would need e.g. a string (char vector):

a = ['7E', '00', '12', ...

But to send this, you would convert it to UINT8 values at first, most likely. So please explain this detail.

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Michael Mathew 2013-10-8

编辑：Michael Mathew 2013-10-8

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Matlab.jpg

Hi Simon, Yup I did the same, following is the code I am trying to execute:

clc; clear all;
serial('COM14','BaudRate',9600);
set(s,'OutputBufferSize',88);
fopen(s);
toNode1={'7E' '00' '12' '10' '01' '00' '13' 'A2' '00' '40' '8B' '63' '85' '08' '59' '00' '00' '00' '00' '00' '1A' '1F'};
h=hex2dec(toNode1);
h1=(dec2hex(h)); %just making sure its hex itself; because none was working
binblockwrite(s,h1); %tried fwrite(s,h) but didn't work
b=fscanf(s);
fclose(s);