How do I wire 9-pin rs232 to usb?

Written by greyson ferguson
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How do I wire 9-pin rs232 to usb?
Convert a 9-pin serial connection into a USB port. (serial connector image by Victor B from

Before USB, serial connection ports served as the go-to method for hooking up equipment to a computer system. There are many different sizes of serial connections, with the 9-pin RS232 as one of the most popular. This cable hookup allows you to send data directly between printers, scanners and other hardware and the computer. If you are running an older computer system (Windows 2000 or earlier, typically) you probably have a 9-pin serial connection, without any USB ports. In order to sync up a USB device to the computer, you must convert the 9-pin RS232 cable connection to USB.

Skill level:

Things you need

  • Serial-to-USB adaptor
  • Driver installation CD

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  1. 1

    Plug the serial end of the adaptor into the 9-pin serial connection on the computer system.

  2. 2

    Hand-tighten the screws on each side of the serial connector to secure the adaptor into place.

  3. 3

    Plug the USB data cable into the USB end of the adaptor.

  4. 4

    Insert the driver installation CD into the disc drive of the computer. Double-click "My Computer," then select the "CD" icon and choose the "Setup" option. This loads the driver installation wizard.

  5. 5

    Accept the end-user agreement, then follow the on-screen prompts to install the driver onto the computer.

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