USB Virtual Comport Assignements

In this article I am going to go over how to force a USB device with a virtual comport to use the same comport.

HKEY_LOCAL_MACHINE\SYSTEM/CurrentControlSet/Control/USBFlags

Add REG_BINARY  value 01 key named IgnoreHWSerNum"VID""PID"
VID = 10C4
PID = EA70
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\USB
IgnoreHWSerNum10C4EA70

HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Control/COM Name Arbiter

COMDB = 03 00 00 00, if you have 2 built-in serial ports (or 01 00 00 00 if you only have one built-in COM port).

NOTE: 03 in binary is 0000 0011 so the lowest bit set (the 1 on the right) means COM1 is in use, and the bit to its left, in the 2 position, means COM2 is set. You will also want to clean keys for any non-standard serial ports from these places:

HKEY_LOCAL_MACHINE/HARDWARE/DEVICEMAP/SERIALCOMM

HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows NT/CurrentVersion/Ports You should be able to power down and reinstall the Digi adapter if it had been removed from the system. If it is installed, reboot the system. The adapter should be redetected and the driver installed. The com ports should now default to start at COM3 (or COM2 with only one built-in serial).