Microsoft KB Archive/103636

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BUG: EV_RLSDS Event Does Not Indicate Current RLSD State


The information in this article applies to:

  • Microsoft Windows Software Development Kit (SDK) 3.1


The EV_RLSDS communications event is documented as indicating the current state of the RLSD (receive-line-signal-detect or carrier detect). However, this event is never set.


If SetCommEventMask() is used to enable the EV_RLSDS event, when GetCommEventMask() is called, the EV_RLSDS bit will always be 0 (zero).


To get the absolute state of RLSD, use the MSRshadow. For more information, please see the following article in the Microsoft Knowledge Base:

Q101417 Accessing the Modem Status Register (MSR) in Windows


This will not be fixed in the Windows 3.1 COMM.DRV.

Additional query words: buglist3.10 3.10

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Technology : kbAudDeveloper kbWin3xSearch kbSDKSearch kbWinSDKSearch kbWinSDK310

Last Reviewed: November 7, 1999
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