My goal was to be able to update the sign from Processing and thereby be able to use it interactively in some way. It was a two step process, first I needed a cable, secondly I needed the protocol. Researching on the interwebs, I was able to find (as we all are) all the information I needed and now I will share this information in one location here, at our first and favourite 'how-to' stop.
Step 1: Hunter and Gatherer
- A Pro-Lite Display Sign (try online, I lucked out in finding mine)
- A four wire telephone cable (RJ12) - look closely and see how many wires there are, six will also work, but four is simpler, a phone extension from the dollar store will usually have four.
- A female serial DB9 Connector – I picked mine up at my local shop, they are easy enough to find online as well.
- a crimp connector or some wire strippers with a crimper built in
- wire clippers
- a computer