Subject:
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Re: some more questions about lnp.
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Sat, 28 Sep 2002 14:06:26 GMT
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Viewed:
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2627 times
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duh... guess i was kinda wrong here.. IR is in reality a frequency defined
from A to B.
any messages sent within this spectre is said to be IR messages. so in
theory sending an IR message closer to A than B from one RCX.
and at the same time sending an IR message closer to B than A from the
other RCX, should make it possible to send and receive at
both RCX at the same time.. only question now is, what frequency does the
RCX and IR tower use!?
unfortunately i have a sneaking suspicion that they all use the same
frequency which makes my point below still valid.
oh well..guess im just rambling here.
regards
kenneth
kennethj@stud.cs.uit.no
kenneth johansen wrote:
> ok, im back again with even more questions.
> when i created my last program using lnp on an RCX i did a mistake by
> setting the same port as the one im listening on and the one im sending
> on.
> this made me think. what is the reason we use two different ports to
> listen for, and send, messages?
> i mean, you are either sending or receiving. IR by its nature (as i
> understand it), is a broadcast medium and if one RCX sends at the same
> time
> as another RCX tries to send, the resulting IR that may, or may not, get
> to the other RCX will most likely be garbled. thus an RCX cannot
> be sending and receiving an IR message at the same time!
> By this errr....theorem(?) i conclude that only one port is needed to
> send and receive.
>
> soo..hmm...any comments ?
>
> regards
> kennethj
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Message has 1 Reply:
 | | Re: some more questions about lnp.
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| The frequency of the RCX's IR does not change at all: " The RCX uses a 38kHz carrier, which is pretty typical for TV remotes. As for the sampling rate, the RCX runs at 2400 bps, which makes each bit approx 417us " (URL) think the only way you could (...) (22 years ago, 28-Sep-02, to lugnet.robotics.rcx.legos)
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Message is in Reply To:
| | some more questions about lnp.
|
| ok, im back again with even more questions. when i created my last program using lnp on an RCX i did a mistake by setting the same port as the one im listening on and the one im sending on. this made me think. what is the reason we use two different (...) (22 years ago, 27-Sep-02, to lugnet.robotics.rcx.legos)
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