Recover Unused COM Numbers
When serial hardware is physically removed from a Windows system without first being deleted from the operating system, Windows continues to mark the COM numbers associated with that hardware as "in use." This allows you to reinsert the hardware and have those ports keep their original COM numbers.
To free up the COM number assignments that are no longer associated with hardware physically present in the system, follow these steps:
- Launch MAX.
- Select Tools»NI-Serial»Recover Unused COM Numbers.