I'm upgrading my Aqualink board and adding an iAqualink and a Pentair Intelliflo VS pump. I have one All Button control panel. So that's 3 devices that want to use RS-485 and there's only two (red 4-pin) connectors. I think that RS-485 is a serial protocol and devices each have an address, so I can connect multiple devices to the same terminals. The manual hints at this saying something like "if you want to connect more than 2 devices to a connector, get the expansion board". Can I just connect the pump and the control panel to one terminal and the iAqualink to the other?