Subject:
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Communicating with RCX native serial port
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 12 Mar 1999 22:54:36 GMT
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Viewed:
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941 times
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I have been trying for the last week to get my RCX to respond to serial
commands i am a little confused. I think i understand most of the
header packet stuff but here's where im stuck...
you send 0x55 0xff 0x00 as the header...
I am sending this as a typecasted byte eg. byte(55 + ff + 00)
should i send it as an ansi string of the converted hex? or just as a
byte?
next i add to that header the command in this case i am trying for a
basic alive response..which i have tried a 0x10
so now i would be sending 55 ff 00 10
at this point im stuck as well since in one place i have seen it sent at
55 ff 00 f7 then 10 and some other hex which i am not sure where it is
coming from.
Also i noticed that the programs for communcating native have done a
bitwise OR operation. Is this done on the entire message and then
appended to the message? like a check sum? or is it just on the command
and not the header?
but either way the RCX responds with an incorrect reply and if i try to
many different combinations i eventually fry the RCX and have to upload
the firmware again.
If anyone could help i would Really appreciate it...im not sure my RCX
can take much more of my IR attacks.
BTW im using Delphi and using assembly to send to the port on a win98
machine.
TIA
Barry R.
http://www.angelfire.com/ar/lego
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Message has 1 Reply:
 | | Re: Communicating with RCX native serial port
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| (...) The packet format was described a long time ago by Dave Baum. A copy of his original message is at: (URL) also: (URL) these documents, you should be able to figure things out, minus programming-related issues. -Kekoa (25 years ago, 13-Mar-99, to lugnet.robotics)
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