VS Arduino - DTR activated on opening serial monitor

Jul 15^th, 2025 at 11:56pm (UTC)

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VS Arduino › › › DTR activated on opening serial monitor

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DTR activated on opening serial monitor (Read 6290 times)

dkallergis Newbies Offline Posts: 3 Joined: Dec 6^th, 2012	DTR activated on opening serial monitor Dec 11^th, 2012 at 1:39am	Print Post
	Each time I open the serial monitor, the Arduino board is reset. The board is also reset if I press Connect in the serial monitor to close and reopen the serial port connection. Is it a bug or am I doing anything wrong because in an older version it would not reset the board unless I pressed the DTR checkbox on the serial monitor. I have checked that Tools->Options->VisualMicro->Communications->DTR is false and tried changing Properties->StartupDelayOrDTR to false but no luck... I am running version 1.1211.04 with latest debugger. Thanks,Dimitris
	« Last Edit: Dec 11^th, 2012 at 1:44am by dkallergis »

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Tim@Visual Micro Administrator Offline Posts: 12191 Location: United Kingdom Joined: Apr 10^th, 2010	Re: DTR activated on opening serial monitor Reply #1 - Dec 11^th, 2012 at 4:22pm	Print Post
	If you open the serial monitor when a non-debug/release version is uploaded to the arduino does it still reset when DTR is OFF or is this a debug problem only?
	« Last Edit: Dec 11^th, 2012 at 5:45pm by Tim@Visual Micro »

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dkallergis Newbies Offline Posts: 3 Joined: Dec 6^th, 2012	Re: DTR activated on opening serial monitor Reply #2 - Dec 11^th, 2012 at 8:36pm	Print Post
	I have two mega boards, one runs on an old 'sketch' that had been compiled on a previous version of visual micro without debugger, the other I tried with a debug compile and a release compile. All cases had the same behaviour i.e. either when I open the serial monitor or when I uncheck and check the 'connect' box on an open serial monitor, the board resets. The DTR checkbox is unchecked in all occasions on the serial monitor. If I check and uncheck DTR it also resets as it should. Hope that helps.


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Tim@Visual Micro Administrator Offline Posts: 12191 Location: United Kingdom Joined: Apr 10^th, 2010	Re: DTR activated on opening serial monitor Reply #3 - Dec 28^th, 2012 at 7:36pm	Print Post
	I am having trouble replicating this. One thing that might be of interest is that the StartUpDelayOrDtr setting only takes affect after next compile. So if you have a debug version of the program already uploaded to the arduino that had StartUpDelayOrDtr=True then the DTr will be forced on each time you open the serial monitor. Two questions:- Does this problem happen if you upload a non-debug version? Have you tried to re-compile and upload a debug version with StartupDelayOrDtr=false?


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dkallergis Newbies Offline Posts: 3 Joined: Dec 6^th, 2012	Re: DTR activated on opening serial monitor Reply #4 - Jan 12^th, 2013 at 2:58am	Print Post
	Tim@Visual Micro wrote on Dec 28^th, 2012 at 7:36pm: only takes affect after next compile You are right! Problem solved! Sorry about that, I guess I somehow forgot to recompile before returning StartUpDelayOrDtr to True...


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