RS232 MatLab Interface
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I have a project where I need to input data from a microcontroller via RS232 and display to a graph. To test the connectivity, I am trying to use Hyperterminal on a PC connected to another PC running MatLab.
I am able to view the characters in MatLab from Hyperterminal, however, they only appear once the fscanf() function times out. My project entails a continuously updating graph so I will need to display this data as soon as it hits the buffer. Is there anyway that I can continuously read data with RS232?
Any help is appreciated as I have been trying to figure this one out for a few days.
Thank you,
Steve
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Answers (4)
Walter Roberson
on 19 Jan 2012
Set the BytesAvailableFcnMode to 'byte'; see http://www.mathworks.com/help/techdoc/matlab_external/bytesavailablefcnmode.html
If your data is continuous and not line structured, you should more likely be using fread() rather than fscanf() (but there can be reasons for using fscanf(), if you are careful.)
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Steve
on 21 Jan 2012
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Walter Roberson
on 21 Jan 2012
fread() without an argument asks for all the data until the object's InputBufferSize has been reached. Specify the number of bytes to read in the fread() call.
Manikandan
on 11 Aug 2013
i,m trying the same but i use simulink to show signal via scope, the output is not an exact data and it is not updating data regularly, first i tried interconnection of 2 PC via rs232. let me say if any suggestion to overcome this problem..
Reg, R.Manikandan,M.E.,(Ph.D)., AP / Department of EEE, The Kavery Engineering College, Mecheri (po), Salem(dt), pin:636453 Tamil Nadu, India. Cell: 9944270473 Email: electricmani@yahoo.co.in
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Walter Roberson
on 11 Aug 2013
Please create a new Question for this. The operations for Simulink are notably different.
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