Subject:
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Re: Have you guys seen Meccano's "RCX" ?
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 31 Oct 2003 18:22:13 GMT
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Viewed:
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935 times
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In lugnet.robotics, Ralph Hempel wrote:
> Seriously, we all know there's a need for something bigger (not necesarily better)
> We've had discussions ranging from one "superboard" to smaller collections of
> smart controllers on a single power bus.
[snip]
> I'm not sure what my point is, but I sure would like to see something different
> from LEGO too, probably using smart bricks that use a single power bus. I really
> like the DCC protocol for this kind of thing, plus it's public domain so there
> are no patent or IP issues as far as I know.
>
> The one thing missing from my initial reading of DCC is the lack of two way comms
> except through the acknowledge bit. Perhaps this could be extended...
In fact, NMRA has a proposal on the table which specifies how DCC decoders can
talk back to the command station. The decoder basicly sends a reply in between
DCC packets (during which time track power is removed) using a current loop at
125 Kbps. Check out RP-9.3.1 and RP-9.3.2 on the following page:
http://www.tttrains.com/nmradcc/draftstandardsandrps.html
From skimming the proposal, I'm not sure how compatible this scheme is with the
current generation of decoders. After the power black out window, I'd expect
many decoders would glitch when power is restored.
Mark
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Message has 1 Reply:
 | | RE: Have you guys seen Meccano's "RCX" ?
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| (...) a need for communications on a single pair of wires with up to 256 devices. Sound familiar? What we do is hold the line steady and the device applies load across the line so the loop controller can measure current pulses to decode information (...) (21 years ago, 31-Oct-03, to lugnet.robotics)
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Message is in Reply To:
| | RE: Have you guys seen Meccano's "RCX" ?
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| (...) And at $395 US for just the brick I'm sure we'll all line up to buy one :-) NOT! Seriously, we all know there's a need for something bigger (not necesarily better) We've had discussions ranging from one "superboard" to smaller collections of (...) (21 years ago, 31-Oct-03, to lugnet.robotics)
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