PH Expansion Module

[carlii]

I am about to order a PH expansion module. The question is how does it connect to my system? I have a Reef Angel Plus controller with two relay modules and a wifi attachment.

I will ask about code if necessary after I order it.

[rimai]

If you don't already have the expansion hub, you will need one.
You will connect the hub into your main relay box and the relay expansion module and the pH expansion module into the hub.