Subject:
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Re: programming the Cybermaster.
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 25 Feb 1999 07:20:12 GMT
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Original-From:
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Peter Ljungstrand <PETER@INFORMATIK.GU.SEavoidspam>
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Viewed:
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1053 times
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> I still have problems programming my Cybermaster.
>
> I try to send to the tower (with the Java Programm of Dario Laverde)
>
> 55 ff 00 10 ~10 10 ~10 -> alive?
>
> And I only recieve 00 00 as an answer.
The packet headers on the Cybermaster and the RCX are different.
The RCX packet header in both directions (to and from host computer) :
55 ff 00 - (3 bytes)
The Cybermaster packet header when sending from host computer to CM:
fe 00 00 ff - (4 bytes)
The Cybermaster packet header when sending (a reply) from the CM to the
host computer:
ff - (1 byte)
All packet headers are followed by the same type of packets, which look
like this:
D1 ~D1 D2 ~D2 ... Dn ~Dn C ~C
where D1...Dn are the message body, and C = D1 + D2 + ... Dn.
If you send a packed like this to the Cybermaster,
fe 00 00 ff 10 ef 10 ef
you should get the following response:
ff ef 10 ef 10
See here for a commented example "conversation" session between the CM and
a PC.
http://www.viktoria.informatik.gu.se/~peter/lego/captured_data.txt
See here for Kekoa's excellent description of the RCX/CM protocol:
http://graphics.stanford.edu/~kekoa/rcx/
NB: You should be aware that the hardware layer and serial protocol is also
somewhat different between the RCX and the Cybermaster.
Check my web site for details.
-------------------------------------------------------------------------
Peter Ljungstrand; PLAY Research Group, Viktoria Institute
http://www.viktoria.informatics.gu.se
Email: peter@informatics.gu.se
Phone: +46-(0)31-7735543 Mobile: +46-(0)708-302251
Fax: +46-(0)31-7735530 ICQ: 6820636
Visitors: Viktoriagatan 13, 7th floor
Snail-mail: Box 620, 40530 Göteborg, Sweden
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message is in Reply To:
 | | programming the Cybermaster.
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| HI I still have problems programming my Cybermaster. I try to send to the tower (with the Java Programm of Dario Laverde) 55 ff 00 10 ~10 10 ~10 -> alive? And I only recieve 00 00 as an answer. Are the opcodes ((URL) for the cybermaster different is (...) (26 years ago, 25-Feb-99, to lugnet.robotics)
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