BUG: EV_RLSDS Event Does Not Indicate Current RLSD State (103636)


The information in this article applies to:

  • Microsoft Windows Software Development Kit (SDK) 3.1
This article was previously published under Q103636

SUMMARY

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.

SYMPTOMS

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

RESOLUTION

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

101417 Accessing the Modem Status Register (MSR) in Windows

STATUS

This will not be fixed in the Windows 3.1 COMM.DRV.
Modification Type:MinorLast Reviewed:7/13/2004
Keywords:KB103636
©2004 Microsoft Corporation. All rights reserved.