Advantech ADAM-5511 Manual page 6

4. Carefully pack the defective product, a completely filled-out Repair
and Replacement Order Card and a photocopy of dated proof of
purchase (such as your sales receipt) in a shippable container. A
product returned without dated proof of purchase is not eligible for
warranty service.
5. Write the RMA number visibly on the outside of the packageand
ship it prepaid to your dealer.