Article View: sci.electronics
Article #22315Re: 2 way IR LED systems
From: ted.o.burger
Date: Tue, 20 Feb 1990 19:38
Date: Tue, 20 Feb 1990 19:38
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> In article <6313@ncar.ucar.edu> hpoppe@bierstadt.scd.ucar.edu (Herb Poppe) writes: > >How about 2-way data communication (half or fuyll-duplex)? > I think it's been done. Some HP calculators have the ability > to send data to the little HP printer via IR beam. The printer > checks for data corruption, and, if it detects an error, requests > a retransmission. Of course, this system requires a clear > line of sight between sender and receiver, which would be a Bob Thr HP system is NOT a two way system. The data is encoded in a (almost) full error correcting format. Their goal was to provide the link with minium cost to the calculator so they could include it on the maximum number of calculators. The calculator just has a single diode and the reciever is in the printer. Only the people who want the printer have to spend the bucks to get the IR receiver. Ted
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!watserv1!watmath!att!cbnewsk!tob From: tob@cbnewsk.ATT.COM (ted.o.burger) Newsgroups: sci.electronics,rec.audio Subject: Re: 2 way IR LED systems Summary: HPs link is not two way Keywords: HP calculator IR data communications Message-ID: <2099@cbnewsk.ATT.COM> Date: 20 Feb 90 19:38:31 GMT References: <431@skipper.dfrf.nasa.gov> <6313@ncar.ucar.edu> <22296@uflorida.cis.ufl.EDU> Distribution: na Organization: AT&T Bell Laboratories Lines: 17