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Although a UPC number has 12 digits (implying a maximum capacity of a trillion items), the first digit is a category code that in practice is almost always, and the final digit is a checksum used for detecting errors.
The use of a checksum is really minimum security considering what is involved.
We follow the message with a checksum , so the provider can verify (to some degree) that our message has been faithfully received.
Neither verification by comparison nor by checksum is available.
There's two things that you'll have to do every time you change a register value, you'll have to authorize the writing of the registers and re-check the checksum before writing the registers.
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