Hello

if you dont have a manual, here it is

http://www.intermec.com/public-files/product-profiles/en/6820_spec_web.pdf

here are some educational videos , could you find how to use 6820 ? not sure

http://www.intermec.com/learning/content_library/videos/index.aspx

this is all; i could find --

you may wsih to contact Intermec and ask if they have a edcuational brochure on how to use this -- its old technology

http://www.intermec.com/about_us/contact_us/index.aspx

i hope i was able to help you !