I just got my new PRT benchtop and spent the day setting it up. I had to buy a USB-serial adapter to connect to my laptop. I loaded the adapter drivers and the device manager says it's working properly. The yellow screen came up and I tried to load the firmware. When the 45 seconds were up I got an error message saying that everything is connected properly but there was a problem with transmission. I'll call tech support in the morning but I'd like to know what the problem is.