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I'm a user, not engineer, but.. you might want to try this if you
haven't already. I had the same difficulty and went through all the
toubleshooting methods you have.
This is going to sound silly, but has worked for me: With the IR tower
on low setting and RCX brick quite close, facing it, I then shield any
overhead light. You can try it quickly by leaning over to shade the
transmission. If no, or only partial success, use a piece of heavy
dark paper to build a tunnel for the transmission.
I have generally had very poor results in transmitting with these IR
towers. It can be extremely frustrating. Even the above is not a sure
solution. Sometimes after unplugging everything, rebooting, and moving
the objects, just standing over it -- it'll suddenly work. other
times, I'll have done a complete process of elimination with brick,
batteries, tower, cables, system extentions, ports, and machines with
no success. it's quite mysterious.
oh, one conflict I found was related to Palm Pilot software. I have to
disable the serial checker that runs on startup.
good luck.
-Suz.
"Paul E. Rybski" wrote:
>
> Hello,
> I'm teaching an RCX-based programming class using the Robolab
> software to a group of 19 4th,5th and 6th graders. I've been trying to
> get the Robolab software installed and running on the Powermac 5500/225s
> and 6400/200s owned by the school. Every time I try to run Robolab and
> download firmware or even just test the communication between the
> transmitter and the brick, I get an error saying that the macintosh could
> not communicate to the RCX and the graphical error display shows a red X
> over the transmitter, the cable and the RCX. However, I do see the little
> green LED inside of the transmitter turning on. [...]
> Any advice, words of wisdom or troubleshooting suggestions would
> be greatly appreciated.
>
> Thanks!
>
> ---
> Paul E. Rybski --- http://www.cs.umn.edu/~rybski
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