Problem to talk to an instrument using rs232

[Spielberg]

Hello,

We are trying to communicate to a ROD-4 (instrument) by using an rs232 link. We have a program from rod-4 on pc and this communicates with the instrument(--> rs232link is OK I suppose) but we can't program everything we want. Therefore we will use Labview to communicate with the instrument(Rod-4). We have made a VI to communicate with the ROD-4 but it doesn't work. Do you want to check the VI I have made to communicate by rs232. Check also the rod-4 maual.pdf on pg 8 and 9, there is standing which program language the rod-4 knows (ascii protocol). The machine(rod-4) answers in the string read with:'' ?\n\r ''what dus this means?
(Using win98se with Labview 5.1)

Thanks.

[Dennis_Knutson]

One problem is that you're not sending the stx control character (hex 02). You're sending the text "s", "t", "x". I've attached a picture of a modified VI that should work. Note that I replaced the serial functions that you're using and used VISA commands instead. I'm also curious about something. You said you're using LabVIEW 5.1 but the VI you posted is version 6.1.

[Guibang]

Thank you Mr. Denis Knuston, you solve my problem. I had a similar problem trying to communicate with the serial port in LV. The only thing I have is set the \ codes display in the parameter of the string control. I will remember this one.

[tocaja]

Hello, I have worked in labview with GPIB, and now, I need control my instrument with rs-232. My instrument is a tesslameter, could I control my instrument since Labview with your example?? I have labview 6i.

[Spielberg]

Hello,

We have tried to build the VI that you send in the jpg file, but it doesn't work. Have we made an error or something because it won't work. The VI we have made is in the attach.

Thnx.

[Spielberg]

Hello

Thank you we have found a solution.
It works well !!!
Thanks to all !

Greetz

[Dennis_Knutson]

What was the solution?

[Spielberg]

Hello,

A problem was like you said 02hex (ascii),but unless we changed it and your program doesn't work!
And the I found this VI on the internet en this works !
Check it out in the attach !

Thanks a lot !
Greetz.

Message Edited by Spielberg on 02-25-2005 12:00 PM

[Spielberg]

Open up your block diagram and right click on your string constant that contains the text \0201SFD50.5\r, then select '\' Codes Display. You will notice that your string will change to \\0201SFD50.5\\r. If you are not trying to send the ASCII character '\' remove the additional slashes. This is the difference between an ASCII character display and ASCII code display.


This maybe work also with your program, I am going to try it monday and I let you know something !

[tocaja]

My VI don´t work with this jpg file,I have labview 6i,Can you show me your design in jpg file??