Com port Voltages Tags: Motherboards Comm Port Last response: January 31, 2005 8:12 PM in Motherboards Share barrada January 31, 2005 9:08:32 AM Does anyone know what the voltage is that comes out of the com port? I am setting up a relay to a transformer to operate a flashing light off com port2 on an Asus Motherboard and I need to know what the voltage is. thx www.barrada.co.uk More about : port voltages fishmahn January 31, 2005 7:05:09 PM Based on a google search, this <A HREF="http://www.interfacebus.com/Design_Connector_RS232.html" target="_new">http://www.interfacebus.com/Design_Connector_RS232.html...;/A> came up and it and the links in it say it is supposed to handle anything from 3 to 15 volts. In the db25 spec, pin 9 and 10 are supposed to hold a + and - (respectively) 12v signal for testing only. Mike. barrada January 31, 2005 8:12:02 PM Thx for this. Why didn't I think of Google!!! www.barrada.co.uk Can't find your answer ? Ask ! Publish Related resources Solvedi3 motherboard with Com Port Forum open com port Forum SolvedConfigure usb port for com1 Forum SolvedNew Build and com port question Forum STMicroelectronics Virtual COM Port not installing correctly Forum SolvedWhat is a com port? Forum Printer installation in COM Port Forum com port error Forum com port problem Forum com & lpt port Forum turn ubs port into com1 port Forum Please check the this link: http://www.dlink.com/uk/en/home-solutions/connect/print-servers/dpr-1061-3-port-multifunction-prin Forum need a com port Forum Bluetooth COM Port Not Working - Mouse/Keyboard Unusable - No PS/2 Ports - How To Repair? Forum Com port being blocked ~ hard problem to track Forum AGP port voltages? What'd I miss? Forum Vista com port 1 to usb Forum Com Port Forum Computer Port Voltages and Computer Fan Forum How to connect an old COM port device to a computer with only a USB? Forum More resources Read discussions in other Motherboards categories BIOS Boot Chipsets ASRock Asus Chaintech DFI Elitegroup FIC Foxconn Gigabyte Intel MSI-Microstar !