Unable to access any ports above COM9 in Windows NT with an application.

Unable to access any ports above COM9 in Windows NT with an application.

Symptom:

I'm writing my own application and I am not able to access any ports above COM9.
 

Cause

In Windows NT, the ports above COM9 must be addressed with the following naming convention: .COM#

Solution

For example, COM10 should be addressed as .COM10.  You may also address COM1-9 with the same naming convention.  Windows NT will recognize either name.
Last updated: Aug 08, 2017

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