I've been having a time trying to get this box to connect to the computer, I was first trying to connect it to a lap top with I believe windows 8 using a USB to serial port adapter and I couldn't get it to work it just kept saying loopback test, so I called msd tech they didn't say much except they said it could be the USB to serial port wasn't compatible. So then I brought it home and remembered I had an old desk top with windows 98 and it had a serial port so I thought problem solved but no. On this computer it says not com port available when you enter the msd software then I try refreshing com port in the software and it says something like com port 1 not available invalid handle. Can someone help me out???

in the lap top I try all the USB ports and tried to Change the com port number nothing worked and on the old computer it's only got one com port. And yes I had it powered up.