FLuke

[Veeru]

Hi I have communicate through RS232 to the Fluke 3380A scope.

I tried simple Read/Write prgms,it seems not working.

[Dennis_Knutson]

First try using Hyperterminal to verify you have the correct com settings and that you are using the correct type of serial cable. Once you get that to work, then try LabVIEW. If that does not work, check to see if you are sending the correct termination character and are formating it correctly (i.e. '\' Code Display is on).

[Veeru]

Thanks Dennis.  I am using the correct cable(just checked with the other scope),

When i try to send some command its not responding.

[BerkO]

Hi Veeru,

RS232 is usually trickier than other communciation interfaces. 

Are you making sure that you are matching the communication settings in the example properly with the communication settings on your instrument?

Also one thing to watch out is the termination character, if you don't set the termination character properly, you can have various problems ranging from timeouts to not even getting a response back.

[Dennis_Knutson]

And what do you mean by 'other scope'? If it's an identical model, then you may have to change the com settings of the scope that doesn't work. If it's a different make and model, then your test doesn't mean much. There is no standard and one vendor may decide to use a null modem cable and another will use a straight-through. A single vendor may in fact decide to use different types of cables with different models.