Subject:
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RE: RCX and IR Range Characteristics?
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Tue, 24 Apr 2001 14:04:21 GMT
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Viewed:
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3502 times
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As expected Jeff Hazen and John Barnes sent along a few
itmes of interest.
> I'm trying to characterize a persistent problem with
> the pbForth serial library, with respect to message reliability.
>
> It seems that even in high range mode, I can't communicate
> more than a few feet with my RCX and tower. I'm using a 9V 800mA
> adapter with no load on the RCX to power both the tower and
> the RCX.
Jeff asked if the diffuse cover of the tower had any effect
at all. From my experiments, Jeff - the answer is no.
John Barnes suggested that the bit-balancing act that the LEGO
designers went through in the protocol was not there to intentionally
slow things down! In fact, this is the main determination
of range.
If I send "U" characters (0x55) I get quite a large range (longer
than the room I'm in). Other characters, depending on bit balancing
give less range.
It looks like I may need to keep normal (non-balanced) ASCII communications
on the low range so that the IREDs are not swamped, and maybe add a balanced
mode too.
Note that this may affect the LNP thing in legOS - does anyone know
if legOS uses balanced bits?
Cheers, Ralph
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Message is in Reply To:
 | | RCX and IR Range Characteristics?
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| Hi All, A while back, Ben Erwin asked about other user's experiences with the IR tower and range. I'm trying to characterize a persistent problem with the pbForth serial library, with respect to message reliability. It seems that even in high range (...) (25 years ago, 24-Apr-01, to lugnet.robotics.rcx)
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