How to read the Temp from Watlow EZ Zone-PM

[sateesh.ibrampur@gmail.com]

Hello, I am trying to achieve a simple task of reading tempearture from Watlow- EZ Zone PM -Temp controllor by using LABVIEW 8.5. I am quite new to Lab view, but I through my simpel read.vi seems like am able to through VISA to the the controllor, however I am not able to read the temp propoerly from that device. Based on the Watlow website information I am using address-360 for reading anlog input-1, however the number I am reading is quite different from the temp controllor is displaying. Can any one please help...

[KateB]

Instead of programming VISA to read Watlow by yourself.

I'd recommend using instrument driver found in http://sine.ni.com/apps/utf8/niid_web_display.model_page?p_model_id=16725 to communicate with Watlow.

Please give it a try.

[KevinR]

Hi Kate, Any chance of getting that driver in 8.5?  Many thanks!

[KateB]

I can manage to down grade only vi in public folder, but you should not find any problem using it, since it's very straightforward.

[KevinR]

Thanks so much!

[a.jones]

I am also having problems communicating with the EZ-Zone PM.  I am running a Modbus RTU network so the drivers below do not work for me.  I have verified communication using a visual  basic program that reads the float (L/H) output at address 360 (i.e. 40361).  When I try to use labviews modbus drivers i can see that the controller is pinged and I get a response of some sort but the number is something like 4750 and erratic.  I think I need to convert this from the float (L/H) to a decimal but I don't know how to do this.  Should I be recieving two numbers, one for the low and one for the high?  How can I program labview to convert these?  I appreciate your help.

[mcnearymw]

If you've downloaded and installed the LabVIEW EZ-Zone Drivers from the Watlow site. Open and run the Watlow EZ-Zone Example.vi.  I just ran this with my laptop connected to an isolated RS485 USB adapter and I could read the temp from zone 1 & 2 of my controller.

[moonrocks]

What is the address that you used to read the temperature?  Thank you.