Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!swrinde!ucsd!ucbvax!hplabs!hp-pcd!hpcvra!lorenh
From: lorenh@hpcvra.CV.HP.COM (Loren Heisey)
Newsgroups: comp.sys.handhelds
Subject: Re: Format of the hp28s IR led output.
Message-ID: <17980008@hpcvra.CV.HP.COM>
Date: 8 Dec 89 17:16:35 GMT
References: <2371@gmu90x.gmu.edu>
Organization: Hewlett-Packard Co., Corvallis, OR, USA
Lines: 14


>>Since the infrared led is also used by companies other than Hewlett Packard, I
>>want to make its code (as far as me and some friends of mine have cracked it)
>>public.
>
>The details of the IR interface code were published in the Hewlett-Packard
>Journal about three years ago.  Your local HP sales office should be able to
>locate a copy for you.

You can also get details on the IR transmission method used by HP IR
printing calculators by writing to HP's Calculator Technical Support.
They will send information that gives the timing requirements and data
encoding of the IR transmitter to anyone who asks for it. Their address
is listed on the inside back cover of any HP calculator OWNER's manual.