Hi all. So, the Arduino community is large and diverse enough that I’m hoping there are some swimming pool equipment authorities out there.
I have a Hayward Aqua Plus (model PL-PLUS) controller for my saltwater pool. This unit has a 4-wire connection for a wired remote control (Hayward AQL-WW-P-4 or AQL-SS-6B). I’d like to instead connect a homebrew Arduino project.
Anybody have information on the electrical spec for this interface or the communication protocol used? Could be as simple as power, ground and RS232 TX / RX? Or, maybe half-duplex RS485?