Subject:
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Re: Help with my IR tower
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 2 Jan 1999 11:58:18 GMT
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Original-From:
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Adrian Godwin <adrian@fangorn.%NoSpam%demon.co.uk>
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Viewed:
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1504 times
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I've had no problems with the Mindstorm's use of the IR tower, but some
problems with the Rcx.tcl script under Linux. I'm using /dev/ttyS0 (COM1)
with the Lego-supplied 9/25 adapter.
Initially, the script failed to get any echo or ping response from the RCX.
Running Kermit on the same port, I found that the first 40 - 50 characters
echoed were garbage, but after a little while the transmitted characters
were echoed. If I stopped typing, the IR tower LED went out and the same
behaviour was repeated. This seems to me like a problem with a data slicer -
the IR receiver floats to a poor slice level when there's no data and
eventually stablilises after it's seen enough bits to average to a reasonable
level. This is consistent with the need to have the IR messages 'balanced'.
However, I then ran nqcc : this seemed to talk OK. And afterwards, rcx.tcl
worked, and Kermit showed correctly-echoed characters after a much shorter
sequence was sent.
Does nqcc do something to the port that rcx-tcl needs ? Perhaps set some
handshake line correctly, and leave it set ? Something that might affect
the behaviour of the IR receiver ?
-adrian
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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