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- Path: sparky!uunet!gatech!usenet.ins.cwru.edu!agate!ames!lll-winken!telecom-request
- From: hutzley@ranger.dec.com (Steve Hutzley)
- Newsgroups: comp.dcom.telecom
- Subject: Re: Format of ZIP Code Bars on Envelopes
- Message-ID: <telecom13.21.2@eecs.nwu.edu>
- Date: 11 Jan 93 23:22:33 GMT
- Sender: Telecom@eecs.nwu.edu
- Organization: Digital Equipment Corporation
- Lines: 30
- Approved: Telecom@eecs.nwu.edu
- X-Submissions-To: telecom@eecs.nwu.edu
- X-Administrivia-To: telecom-request@eecs.nwu.edu
- X-Telecom-Digest: Volume 13, Issue 21, Message 2 of 13
-
- In article <telecom12.928.7@eecs.nwu.edu>, ssay@prefect.cc.bellcore.
- com (say,halim s) writes ...
-
- > I would like to find out the encoding for the ZIP code bars on USPS
- > mail envelopes.
-
- > I could figure out this much:
-
- > Ones are long bars, zeros are short bars. Start and end with a one.
- > Each digit has five characters. I could figure out what zero through
- > nine correspond to.
-
- > The only remaining part is the check digit at the end. Only one check
- > digit is used both for five digit regular ZIP code and nine digit
- > extended code.
-
- > Now my question is: What is the encoding/decoding rule for this single
- > check digit?
-
- > Does anyone know or could you tell me a reference for this "standard"?
- > I am sure some address generator software would have this algorithm.
-
- See {PC Magazine} a few months ago (November/December), they had the
- whole scheme in there. Its kind of an inverted BCD where the LONG ONES
- are 0 and the SHORT ONES are 1 (I think), and there were CLOCK pulses
- in there to compensate for the speed variances of the reading machines.
-
-
- Steve
-