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Struggling getting an Ultrasonic Anemometer (GILL), option 4 (thus SDI12) working on a CR1000 DataLogger


MM81 Feb 1, 2017 06:47 AM

Hello out there.

I am new to this forum and to the fantastic wolrd of Env. Measurements. I have limited experience in electronics and some years in computer sicnetific programming.My new assignment is now set up the wweather station and get it running.

I am having some hard times trying to establish a communication between my wind anemometer (GILL ultrasound wind sensor, OPTION 4, therefore SDI12) and a CR1000 datalogger. I have gone trough the webpage and manuals, have watched the video tutorials and what I could achieve, so far, is frustratingly close to zero.

I could succesfully connect the cr1000 to my PC, via 200W sotware, I can read temperature and voltage, supplied via a generator. So I know that reading on my PC and input volts are consistent. The video tutorial about SDI12 helped me a lot. I could enter the SDI mode on the terminal and, when prompting the sensor identity, I got GILLINSTR. So I know there actually is some kind of alive connection. Now the point is getting my data over my PC.

1) Wiring
The sensor has 4 open end wires. The red one is V+, 12V, which I connected to the datalogger output. The black one, goes into G. The green one, i.e. the signal, was connected to C7 ("Tx" of COM4 slot). I did not connect the other silver cable, coloured in silver. Where shloud I put that?

2) Programming
In order to read in data, I guess, the datalogger and its onboard unit need to programmed and told: "Pleas, at every step don't forget to read in data over channel 7". As far as I have understood that, SHORT CUT is an user friendly interface that will prepare this and, then, compile a routine that will be sent to the datalogger. I did that. COuld include the wind parameters in the datareading interface on the datalogger output. Unfortuntely I only see NaN (Not a Numer, like in MatLab?). Where is the problem? Wiring? Programming? Both? 

3) Special "NO-GO".
I am, as said, very new to all this. What are the thing I should absolutely avoid to burn down my very expansive datalogger? What should I take care of?

Thank you, anyone, for any input ou will be willing to give. Your help is greatly appreciated.
Kind regards

Mark

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