i wanted to add, i recognize the ubiquiti AP under the sign, The locks across the bottom are pretty standard coming out of China, It looks like a P10, DIP, 1R1G1B, get the name off the receiving card from inside the sign, That will tell you exactly what software to use to control it. Each and every controller manufacturer has their own software.
To list some of the majors
linsn
Dbstar
Xixun
Lytec
Huidu
Lumen
There are alot more but these are most of the major players when it comes to controllers. Oh i forgot to mention, it will have either a asyn card or an on board computer making this sign sync.
The wireless comes in 2G or 5G, most of us switch to the 5G due to the fact the airways are jammed with 2G.
I was using on board computers for a spell, i liked that i could use a remote software to back door the sign and run any type of diagnostics i wanted. You can buy panel now that self diagnose. But i recently switched to Novastar, the TB3 and TB6 controllers are super easy to run and you get FREE cloud control, and it is 5G capable, so it is constantly transmitting a signal from the sign and you can login to the signal from your phone and run it from a PDA or whatever with the proper credentials.
And either unit is enough to run the types of sign we sell ( you and I). probably not billboards!
Anyways good luck and let me know if you have any other questions
PS. if you want to switch controllers, you need the numbers off the hub card and the numbers off the IC chips on the back of your tiles, or people call them LED panels. okay bye!