ASCII code and problem with VISA read

[ben64]

The serial port configuration seems to be ok. To help you troubleshoot I would suggest you remove the while loop and the event structure and just try to do a single read.

Have you tried just sending the following string: STATUS_?

Ben64

[sam009]

I tried with a simple write and read and also different form of writing but still there is the sam error.

[Dennis_Knutson]

Earlier, you said you did not check with the c program. You truly have not run the program provided by the vendor? You've only tried your LabVIEW code? If that is true, then besides the incorrect (CR), you could have several problems, including using the incorrect type of cable.

[billko]

Time to break out hyperterminal and see if you can send commands that way.

[ben64]

You might as well start NI I/O trace (NI-SPY) while debugging.

Ben64

[sam009]

It seems the problem is with cable as I checked with hyperterminal and shows error. I will check with another cable...

[ben64]

Make sure you use the type of cable that goes with your hardware (null modem?).

Ben64

[billko]

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@sam009 wrote:

It seems the problem is with cable as I checked with hyperterminal and shows error. I will check with another cable...

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What was the error?  A cable issue would be about in the middle of the list of things I would check at this point.  If you are absolutely certain that the comm settings are appropriate, then the next thing I would suspect is command syntax.  In fact, I just read the manual now.  Look at table right above section 10.2.2.  Admittedly, it is a crappy chart - I've never seen a hex number notated with a capital "H" before - but it is telling you that a CR = 0D wich is an ASCII carriage return.  That doesn't mean that you send the string "0D" with your command instead of the (CR).  Check out this link to see how to implement this.

[sam009]

Thanks all of you,

your comments were very useful I could solve the problem by all your help. I changed the cable and little bit change in the command code. (CR) replaced by \r . Now program is running.