Subject:
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Re: ir tower -> consumer electronics
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 27 Apr 2000 21:53:12 GMT
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Original-From:
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John Barnes <BARNES@antispamSENSORS.COM>
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Viewed:
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720 times
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Either I'm missing something, or there's a fundamental
error in people's understanding of "IR".
The "IR" in question is simply a transmission medium, which
conveniently modulated in the 25 - 50KHz area can be detected
against a background of low frequency light sources souch as
household lighting etc.
This modulation is in turn modulated at a "bit rate" convenient
to the system its being used for, such as a tv or VCR remote
control.
What I don't understand is why you would expect an RCX transmission
which is a bit encoding of standard computer style RS232 serial
data at 2400 bps encoded as 10 bits total, start, 8 data and stop
to match a proprietary transmission standard hatched by a tv or
vcr designer who has no reason or need to use start bits, stop
bits or 8 bit bytes! (After all, they owe their heritage to
teletype machines!)
I suspect univeral remotes that learn, learn bit patterns and
nothing else. I know you CANNOT make a PC serial port do this.
I don't know enough about the RCX's serial port but I suspect
it is also using a UART of some kind, in which case it will
not be able to transmit or receive arbitrary bit patterns
either.
Lego sell a perfectly usable remote for the RCX. I use mine
all the time.
JB
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