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Error in Serial communication between a measurement instrument and matlab via RS232

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Nidhi Singh
Nidhi Singh 2015-10-29
评论： Walter Roberson 2015-10-29
Hi I am trying to setup serial communication between my measurement instrument and matlab through RS232. I have setup the following parameters on my measurement instrument through a setup key on the front panel of the instrument:
  • Communication port-RS232
  • Baudrate-9600
  • Parity-none
  • Databits-8
  • The terminator of the instrument as given in the datasheet is LF/CR
I am getting an error ' * Warning: A timeout occurred before the Terminator was reached*'. I have done some basic troubleshooting like
  • putting pause(2); before fscanf(s);,
  • double checking the terminator of my instrument,
  • testing the RS232 cable
but the error keeps on popping everytime. Please let me know how can I resolve it.
Below given is my Matlab code.
s = serial('COM1');
set(s,'BaudRate',9600,'Parity','none','Terminator','CR');
fopen(s);
fprintf(s,'*IDN?');
out = fscanf(s);
fclose(s);
delete(s);
clear s

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回答（1 个）

Walter Roberson
Walter Roberson 2015-10-29
You indicated that the device datasheet has LF/CR but you configure CR . It would be more secure to configure for LF or CRLF for the serial port. "LF/CR" sometimes means either, but more often means both.
  2 个评论
Walter Roberson
Walter Roberson 2015-10-29
Time to use a different program like TeraTerm or MS-Kermit to confirm that you can communicate with the device outside of MATLAB.

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