I've decided to start documenting the history and evolution of ACA and ASC siren controllers, in order to hopefully clear up confusion and present this information in an easily digestible format. Feel free to contribute any information or corrections if my information is incorrect.
First up, the ASC Compulert U-RTU:
Internals:
The Universal Remote Terminal Unit is basically just a Compulert controller and decoder with relays/relay outputs and/or tone generator depending on configuration. This is pretty much ASC's version of the Federal Signal FC controller.