Subject:
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Re: decoding a message sent by an RCX
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Newsgroups:
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lugnet.robotics.rcx.nqc
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Date:
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Sat, 4 Sep 1999 01:27:58 GMT
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Viewed:
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2109 times
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In article <FHHqAK.J6J@lugnet.com>, "Dennis Clark" <dlc@verinet.com> wrote:
> hiya,
>
> I have been working on an idea to extend the number and type of devices that
> the RCX can control. I started with the idea of encoding serial data on one of
> the motor lines and decoding that in a PIC to do <stuff>. However, because
> working at the bit level in NQC is not possible it would mean that every
> message would have to be built at compile time, ick. Therefore, I have decided
> that receiving a message over the IR from the RCX would be far more practical
> from the RCX's point of view. However I have a couple of questions for those
> that know:
>
> 1. The crynwr page states that the serial format is :
> NRZ, 1 start, 8 data, odd parity, 1 stop bit
>
> I'm not used to seeing 8 bits with a parity bit, as a sanity check does this
> mean that each byte is 11 bits (1 start, 8 data, 1 parity, 1 stop) - OR am I
> misunderstanding this somehow. Since the RCX can send 0-255 as messages, I
> THINK that I'm correct. Can someone set me straight on this?
Yes, you are correct - 11 bits total per byte. And yes, this is very
non-standard.
I believe the signal is inverted - meaning that IR light is present for
"0" bits, and no light for "1" bits. But I'm going from memory here and
haven't looked at it on a scope for a long time so I could be wrong.
Dave Baum
--
reply to: dbaum at enteract dot com
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Message has 1 Reply:
 | | RE: decoding a message sent by an RCX
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| Dave wrote... (...) Remember, you can send arbitrary ASCII data using pbFORTH. For example, to send "Hello World" you just use... : HELLO ." Hello World" CR ; Or to identify your RCX, you could use something like... : WHOAMI ." I am RCX number " (...) (25 years ago, 4-Sep-99, to lugnet.robotics.rcx.nqc)
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Message is in Reply To:
| | decoding a message sent by an RCX
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| hiya, I have been working on an idea to extend the number and type of devices that the RCX can control. I started with the idea of encoding serial data on one of the motor lines and decoding that in a PIC to do <stuff>. However, because working at (...) (25 years ago, 3-Sep-99, to lugnet.robotics.rcx.nqc)
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