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


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


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


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: Jun 25, 2019

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