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See more: C# serialport WinForm
i wrote program in C# winform. i want to when operation is successful, LED will be turn on . i know that i must use this code:

serialport1.open();
serialport1.EnableDtr=true;
serialport1.close();

. but before program is running, LED was turned on. i set ReceiveBuffer to low , in Device Maneger.but didn't work and led is turn on.
Posted 3-Dec-12 1:36am
Comments
lukeer at 3-Dec-12 8:13am
   
How about setting serialport1.DtrEnable = false;? That should turn the LED off.
Sergey Alexandrovich Kryukov at 3-Dec-12 14:28pm
   
It also depends on what pin triggers LED on/off. :-) Could be just data...
--SA
lukeer at 4-Dec-12 1:22am
   
You're absolutly right, I prematurely assumed that it would be attached to the DTR line.
Sergey Alexandrovich Kryukov at 4-Dec-12 11:15am
   
So, I don't see a big problem. From what I know, many used COM and LPT ports for "poor-man little automation"...
--SA

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