Resetting a Serial Port's RTS and DTR Signals when Windows Starts
de Joe W4TV
You can reset a serial port's RTS and DTR signals on Windows startup by creating a Windows batch file containing the appropriate command and then create a Windows shortcut to this batch file in the Windows Startup Folder. To reset COM3's RTY and DTR signals, for example, use Windows Notepad to create a batch file named RESETCOM3.bat that contains
MODE COM3; dtr=off rts=off
Then create a shortcut to RESETCOM3 in your Windows Startup Folder.
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