Karen,
David's solution may help, but it's possible to have pieces of
broken wire that are simply impossible to find. Just to make sure
everyone's on the same page: the "broken wire" in
question is not a physical wire, it's a programming wire that (when
not broken) connects the data hubs of two programming blocks. Those of
you who use wires know that a broken wire shows up as a dotted-gray
line, whereas good wires show up as solid, colored lines.
You may find the wire by moving blocks around, but some wires
resist being found, because they're very short or hidden behind
blocks. There is a solution, recommended in "The Lego Mindstorms
NXT Idea Book." Quoting from that book:
Thankfully there's a helpful tool to fix
this. Due to some incredible foresight on the part of the designers of
NXT-G, not only is the language extendable with features such as
MyBlocks, but the programming environment is as well. One of the tools
that has been developed and can be installed into NXT-G has the name
"Remove Bad Wires." ... Remove Bad Wires is an extension of
the programming environment that just needs to be dropped into an
internal folder of the applictaion. Once there, it appears in the
pull-down Tools menu as an item you can select. It will simply go
through and delete every broken wire in the program, saving you the
trouble.
To install:
1. Create a folder or directory called
"project" in the MINDSTORMS NXT engine folder or directory
(if there's not already one there).
2. Drop the addition (called a VI) into
it.
3. Restart NXT-G.
The code may be found by going here:
http://forums.nxtasy.org/index.php?showtopic=444&mode=threaded
and downloading the file RemoveBadWires.llb at the bottom of the
forum post.
Hope that helps!
Mike
I've heard others recommend
downloading the latest firmware so I suppose that's a good place
to start. If you are still seeing the problem, then
I would isolate the problem block by removing sections of the program
until you get the download to work. ( don't save the
file). Once the block is isolated then replace it with a
new one.
That seems to work for my team although
if there is a better solution, I'd sure like to hear
it.
David
On Nov 2, 2008, at 6:03 PM, Karen
McSweeney Contreras wrote:
We are suddenly having trouble with our robot
accepting downloads from our laptop computer. We get an error
message on the laptop computer that says "There is a data wire that
does not have a data source. Error # 5021." But there do
not appear to be any wires that are not connected!! We tried
connecting a different NXT robot to the laptop and we get the same
problem; so we know it is the program, not the robot. We deleted
the program and reloaded it. Nothing has
helped.
Any thoughts on a solution or where I can find a
solution?
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