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Motorola protocol?

 
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Barf
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Joined: 24 Oct 2008
Posts: 1154

PostPosted: Sun Jun 28, 2020 2:37 pm    Post subject: Motorola protocol? Reply with quote

Has anyone heard of or has experience with the "Motorola protocol", as descibed here (page 3)? Is there an UEI executor?

Just got a request.
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The Robman
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Joined: 01 Aug 2003
Posts: 19699
Location: Chicago, IL

PostPosted: Sun Jun 28, 2020 5:03 pm    Post subject: Reply with quote

I don't see it listed here:
http://www.hifi-remote.com/johnsfine/DecodeIR.html

The closest that I can see looking through the S3C8 code is PID $0011 which is 32kHz and has roughly the right burst times, but appears to only have 7 bits, whereas this one has 9. I haven't tried capturing it to see if that's really what it looks like, I'm just reading the code. CBL/0022 and TV/0070 are 2 fairly common setup codes that use it.

There is one byte of fixed data that gets moved to R06 (in the S3C8 code) but I don't see what purpose that serves.
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3FG
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Joined: 19 May 2009
Posts: 3276

PostPosted: Sun Jun 28, 2020 10:31 pm    Post subject: Reply with quote

Very similar to Blaupunkt, including the beginning and ending transmission of 10 "1"s (including the start bit). The UEI 00A5 executor supports 30.3 and 36.5 kHz and two durations between preamble and the normal data. The MC144105 data sheet (from 1986!) gives timing data for an input oscillator of 500kHz, and that yields a modulation frequency of 31.25kHz. The overall timing in the data sheet is slightly different to that in the PDF from 2001 in Barf's link, but only by a few percent.

I looked at this some years ago, and concluded that Blaupunkt was an adequate representation of the "Motorola" IR protocol.
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