Oh and then the really last thing: In case you want to check the incoming data from the COM port install ‘putty’ or ‘realterm’ and open the correct COM port. I really recommend you to reverse back the changes you made in step 4 and step 9 since this could cause security issues and perhaps will give problems and headache in the future. One last thing you mentioned you also followed the windows 8 – 8.1 instructions. So my next problem was that when I downloaded the Windows 7 software from we.tl/HOW9okhgjP You can also check this but for now I would skip this part. So my COM port worked now and I received data. The following page will describe how to install and download these old drives such that the COM port will work properly. ![]() Anyway luckily some people found out that some old drivers still work on Windows 10 with this chip. Prolific only supports the latest two revisions of this chip, the reason for this is because from all other revisions there are more Chinese clones on the market than official chips. The chip used in the dvm1200 cable is an old revision of the ‘prolific 2303’ chip which is officially not supported anymore from Windows 8. So the problem is that dvm1200 uses an outdated chip (which is located at the end of the cable, where it is inserted in the multimeter) to convert the optical signal from the multimeter to the pc. I followed the instructions on the website but unfortunately when I go to device manager I still see a yellow exclamation mark and the COM port status gives an error 10. I will describe my problem and solution, and probably you will have the same problem After a few hours I finally got it to work on my Windows 10 So I thought let’s create an account and share my solution. Yesterday by chance I wanted to connect my dvm1200 for the first time to my laptop which runs Windows 10 and then I saw your post.
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