Resources
Walt’s Led Sign Page
Lot of information on various led signs.
Led sign hacking by Michael Barton
Michael Barton created a Python library similar to this one. I used some of Michael’s code to figure out the protocol.
Led sign hacking by Andrew Konkol
Andrew Konkol posted on his blog on hacking a 4U2SEE -led sign. Again, some information was useful for figuring out the protocol.