MODBUS / Serial communication with Watlow F4

[Broussard]

Greetings.

I've got a Watlow F4 that I cannot get LabView (8.2) to talk to. 

*  Watlow's program can talk to the controller, so port settings, hardware, etc.

    should be OK.

*  I have downloaded and installed the "Plug and Play" drivers from this site.

When I open and run the "Read From Register" VI, I get error code:

-1073807246

Source - VISA write in WLF4 Utility MODBUS RTU Send Message .vi ->

WLF4 Utility Read From Register. vi

Any ideas?  I'm very new to LabView, so it's likely something simple...

Thanks all,

Zachary Broussard

[Broussard]

Got it..... 

thanks,

ZB

[TomLeamon]

Zachary -

Can you give me some insight into your solution?  I've got the same situation right now:

Error: -1073807339, from the Modbus Recieve Message VI.

WatView talks fine to the F4 so, like you, I assume my comms are all ok.

Any help would be appreciated.

Thanks,

Tom

[pBerg]

Howdy TomLeamon,

I offer to you for review the troubleshooting suggestions these KnowledgeBase articles: Error -1073807339 When Using VISA Read or VISA Write in a Serial VI and Why do I Receive Timeout Error -1073807339 on VISA Write?


Message Edited by pBerg on 03-14-2008 08:51 AM

[TomLeamon]

Thanks for the direction to these articles.  I just managed to get it communicating this morning.  It was clearly a comms setting issue which I fixed by running the MB Serial Init.vi included in the "my modbus serial query" library.  This allowed my to specify all the comm settings I knew were required and the Watlow F4 vis worked fine after that. 

I'm not sure which parameters weren't being set properly but this corrected them.

Thanks again,
Tom

[niccolo]

do you think you can post a copy of you VI here??

thanks
-niccolo

[klqn]

Can you or someone post a fix for this?  This error is killing me.  I am new to this and need the details how to fix it.

thanks in advanced.

kn

[Edgar123]

Hello,

Does anybody have a basic VI to talk to the watlow F4. I have been attempting to communicate with my f4 thru labview with not luck. I can communicate thru watview no problem, I have attempted several things with no luck and I just need help

Thank you,

[Mr.F]

Hi,

What have you tried and what errors have you gotten? Do the previous posts help at all? I don’t have their code, but it may be beneficial to post your code.

[jeb55]

Maybe this example could help.

I tried reusing some of the provide scripts form watlow with no luck. After trial and error the following scripts seem to work for basic commands like set and read temperature.

Controller Single channel F4

Communication: RS232 modubus via Lantronix xDirect-IAP Lan to RS232 modbus adapter.

(Pin 11 on the F4 was connected to pin 9 on the Lantronix adapter for power.)