how to read LAN data's in m-file
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hi,
I sent data from my pc to another pc, only the values sent shows the data. while i am reading in another pc, its not getting read. where sholud i do the mistake?
t=tcpip('192.168.1.4',80) // another pc name
bytesToRead=50;
t.BytesAvailableFcnMode='byte'
t.BytesAvailableFcnCount=bytesToread
fopen(t)
pause(3)
fwrite(t,1:255)
pause(3)
fclose(t)
now, in inspector element, i can see changes in valuesent=255 whereas, the same program only i did in another pc for reading
t=tcpip('192.168.1.4',80) // another pc name
bytesToRead=50;
t.BytesAvailableFcnMode='byte'
t.BytesAvailableFcnCount=bytesToread
fopen(t)
pause(3)
fread(t,255)
pause(3)
fclose(t)
instead of writing. but, there i am not able to see changes in inspector element.how should i do this?
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Accepted Answer
Walter Roberson
on 30 Jul 2012
t=tcpip('192.168.1.4',80) is the command to use on a "client" (the one that initiates the conversation) that needs to connect to a "server" (the one that the conversation is initiated to.)
So it is fine to use it on the first PC to start the conversation to the second PC (provided the second PC's IP address is 192.168.1.4), but when you use it on the second PC, if the second PC really is 192.168.1.4, it would be a request to connect from the second PC's MATLAB to the second PC's web server. On the second PC, you need to instead use a tcpip() command indicating that you want to receive conversations. See the text starting with "Start a TCP/IP server socke" over in http://blogs.mathworks.com/loren/2011/05/27/transferring-data-between-two-computers-using-matlab/
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More Answers (3)
Deepa Darshan
on 31 Jul 2012
Edited: Walter Roberson
on 31 Jul 2012
1 Comment
Walter Roberson
on 31 Jul 2012
The command tcpip() is not part of basic MATLAB: it is part of the Instrument Control Toolbox.
Your version of MATLAB has an Instrument Control Toolbox which is too old to support acting as a TCP server. To communicate between PCs, you need to do one of:
- switch to udp instead of tcp; or
- switch to the File Exchange contribution "tcpupdip"; or
- upgrade your MATLAB and Instrument Control Toolbox version
Deepa Darshan
on 30 Jul 2012
Edited: Walter Roberson
on 30 Jul 2012
1 Comment
Walter Roberson
on 30 Jul 2012
R2010a cannot act as a TCP server when you use the Instrument Control Toolbox. It can receive UDP but not TCP.
The work-around is to use the MATLAB File Exchange contribution named "tcpudpip"
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