We use EM38 Mk2 with a Trimble Yuma running Windows 7. The EM38 connects via Bluetooth and works perfectly.
PIN number is 1234 or 12345 depending on the age of the EM38 MK2 (in some rare cases it might be the last 4 digits of the serial number according to Geonics, but I have never seen this!)
If you have already got a partnership between your Win7 device and EM38, delete it and start again.
When prompted, enter the 12345 and follow prompts to create the connection.
DO NOT get tempted to try and open this connection...Mobile will do this itself when it needs to connect. If you manually connect it, it will be unavailable to Mobile.
Next, go to connection properties and under the advanced COM settings you will see the com port number. If you have been assigned anything higher than com 9 (from memory its 9, mobile might allow a bit higher now) you will have to change it to something LESS than 9, or mobile will not see it.
If you have no free ports below 9, you will have to free one up by changing something you don't need to a higher com port first.
Once you have done this, make sure you have set your sensor driver in Mobile to be the same com port, and that you have ticked the EM38 - MK2 in the Device tab.
I highly recommend you then go to the display settings, and map data display, and set it to show you number of sats, GPS quality, conductivity 0.5m and conductivity 1.0m. That way you know exactly what you are logging as you go along!
Note, the map data display DOES NOT work if you are testing this with the GPS simulator, but you CAN see your EM38 readings on the job tab after you hit the GO button.
FarmingIT Farm Works Support Australia & New Zealand