Change Windows 7 default serial port settings. I need help with how to change how Windows 7 controls a serial COM1 port default settings. I use a very simple serial cable to control special external hardware with. The serial cable only uses the RTS, DTR and GND pins of the cable and does not require. I have used the device on several prior versions of Windows 9. XP with no issues at all with the serial ports. With Windows 9. XP the serial COM1 port had RTS and DTR lines set off by default. I just upgraded to a. Windows 7 and now having an issue with the serial port. Water Training Courses Ontario on this page. For my issue, I need to have the serial port be off by default until the control software loads and specifically opens the serial port to turn the external device on. Using a serial port data tester has lots of green and red leds  I can see that as. Windows 7 boots up, it automatically sets the serial port DTR, RTS and TD lines as HOT high voltage. This is not acceptable as it activates the external hardware before the control software is loaded  Likewise when the control software is closed. Windows 7,  the serial port DTR, RTS and TD lines are again set as HOT high voltage by Windows. Computer Dell Optiplex 7. Windows 7 Pro 6. 4 bit with SP1 installed. Serial Port on motherboard Intel ICH8ICH8. R LPC Interface Controller 2. Serial Driver Microsoft 6. Settings for COM1. Baud Rate 9. 60. Data Bits 8. Parity None. Stop Bits 1. Flow Control None. I have spent hours looking at Device Managerport settings and trying to find anything online with no luck. Is it possible that this is due to how Windows 7 plug n play handles the serial port  How can I disable this so the port is off by default like it. XP and earlier versions of WindowsConfigure Serial Port Windows 7DOSBox is controlled by a file called dosbox. Can be disabled, dummy. Using DOSBox Configuring. Over the past five years or so Ive installed and configured DOSBox several times to enjoy some retro gaming. I grew up playing games like Star Wars XWin. Dosbox Configuration' title='Dosbox Configuration' />DOSBox. However SERIAL CASH DRAWERS WILL NOT. If you choose COM1 or COM2 you will have to select various settings to configure the port to match the settings on. Visa Configure Serial Port' title='Visa Configure Serial Port' />Configuring COM Serial Port on DOSBox. DOSBox. I have a USB to Serial adapter which I would like to use to create an RS232 COM port in DOSBox. How to print from a DOS program in DOSBox. COM1. Standard and asks you if you want to automatically configure DosBox to capture the.