If you have a scanner connected to a computer using FileMaker Pro that is in Keyboard emulation mode, see this thread: Need help writing script to integrate barcode scanning
You may also find this thread of scripted finds useful as you can set up a script for processing the scanned data to perform a find: Scripted Find Examples
If those links are not enough to help you get this started up for you, please feel free to ask specific questions about what you have set up that isn't working for you.
Thank you. I will check those out.