omega HH66U

[alex_mikh]

Hello!

I have thermometer omega HH66U (http://www.omega.com/manuals/manualpdf/M4932.pdf). Thermometer uses rs232  and has usb connection for computer It came with its own software (http://www.omega.com/manuals/manualpdf/M4947.pdf) and works fine with it. But i need to get data from the device in LabView. I saw here couple similar issues with other omega thermometers (http://forums.ni.com/t5/Instrument-Control-GPIB-Serial/Omega-HH506RA-datalogger-thermometer-serial-c... but my one uses different protocol for communication.

It is my first LabView project, and my experience with serial connections is poor too. Will appreciate any suggestion!

[alex_mikh]

i tried to find out information about the thermometer compatibility with LabView from manufacturer, but they just sent to me some protocol (attached below)

 

[Eric-E]

You can typically communicate with third party devices using VISA. The device will then appear as a COM port which you could use for communications to/from the device. Instal the 3rd party drivers, then see if you can open VISA Test Pannel for this COM port in Measurement and Automation Explorer where you could send a *idn command to the 3rd party device. This is a simple read/write command to see if the device is there. These are the first steps. Hope this helps!

[alex_mikh]

Thanks for participation in discussion!

I think I did the procedure that you described above. But for some reason the device didn't answer for commands from the manufacturer protocol. I'm not sure how exactly to use it. Omega sent me just some list of commands, without any instructions about it. Probably someone with enough experience could easy figure out how to do it, but for me it looks complicated.

Basically, I don't know how to form a command which would return me a temperature value from the thermometer. It should be some consequence of bits with particular values for each bit. But it is not clear what each of the bits is responsible for. And the manufacturer is not going to clarify that issue for some reason. Could You take a look on this protocol (attached below) and suggest something?  

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[Eric-E]

Sorry, I'm unfamilliar with these specific types of measurements. Hopefully someone better qualified can follow up with this forum.