Subject:
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Re: Laptop IR
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 17 Feb 2000 16:20:00 GMT
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Original-From:
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Ben Wyckoff <wyckoff@clearway.AVOIDSPAMcom>
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Viewed:
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965 times
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Jim,
I asked this question a few weeks ago, about an Apple
PowerBook IR port.... This is the response I got from Dave Baum:
-------
In theory it may be possible, but in practice it hasn't been done. The
reason is that the PB uses IrDA (it also features a special Apple-only
protocol), while the RCX uses simple NRZ on a 38kHz carrier. In theory
you may be able to use one of the higher IrDA baud rates to manually
generate the 38kHz carrier for transmit, but this would require fairly
low level access to the IR hardware. Receive is an even bigger problem.
When you use the IrDA port as a substitute for a serial port you are
actually running several layers of protocol (IrCOM, TinyTP, IrLAP)
between the virtual serial interface seen by your program and the
physical Ir hardware. The RCX understands none of these protocols.
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So I simply bought an extra IR tower and Mac compatible cable from
Pitsco Lego/Dacta.
- Ben
------------------------------------------------------------------------
Ben Wyckoff wyckoff@clearway.com
Principal Engineer
ClearWay Technologies, LLC. www.clearway.com
"Somehow it seems to fill my head with ideas -
only I don't exactly know what they are!"
Lewis Carroll, Alice, Through The Looking Glass
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Message has 1 Reply:
 | | Re: Laptop IR
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| Ben- I am using a Dell laptop than claims it can be used as a serial port. I think that it is a different IR port than the Mac. Thanks for the input though. Jim (...) (25 years ago, 17-Feb-00, to lugnet.robotics)
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Message is in Reply To:
| | Laptop IR
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| Hello, Does anyone know how to control the brick with the built in IR port of a Dell laptop instead of the tower? Thanks for your consideration. jim (25 years ago, 17-Feb-00, to lugnet.robotics)
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