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Problem connecting from usb to db9

Hi i just bought a usb to db9 cable . i need to reprogram an ecu i fitted to my car but my laptop doesnt have a serial port (only usb)and it is not connecting to the ecu . i use to do this with my friends laptop which had a serial port .What can i do? Thanks

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  • nexia Jun 01, 2008

    no because the ecu only have a Db9 sochet and the laptop has only USB


2 Answers

Not all USB ports are the same on all computers. There is USB and then there is USB 2.0. Many computers/laptops have both. The difference is in the speeds supported and whether or not there is voltage on the pins. Some laptops do not have enough voltage to run the device that is plugged into the USB ports.

Try this: If there is more than one USB port then try another one. If this STILL does not work then get an adapter or multiport hub that has an external power supply with it. See D-Link's Hi-speed USB 2.0 4Port Hub.

Posted on Jun 01, 2008

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There are serial port to USB adapters, but can't you use a USB cable by itself? You can find the adapters at or


Posted on Jun 01, 2008

  • Glenn Rogers
    Glenn Rogers Jun 01, 2008

    Okay, get yourself a DB9 to USB. Be ready to describe what type connector you have male or female and the USB will be Type B

    Regards and good hunting, you can search Froogle from Google.


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