if it comes up with unable to open com port error 45, then the com port is not configured for ACPI . you can check to see what the port is set to by navigating to device manager and expand the port section and look at com port 1 to see if it says com port 1(ACPI). the port switcher program can be a pain, better to do it manually. after you successfully switch the port to 485, you must reboot the computer. then run the dmc program. sometimes when you connect, it will display not responding in the window, just change the display from status to variable, then you should see the variables, now you can switch back to clc and status and it usually will work. also while you are using the port switcher program, if it does not complete within a couple of minutes, and all the windows do not close, then it has failed, you will see unable to open device manager, close all windows and try again. remember to reboot after it finishes completely. again it is sometimes better to do it manually