Can two AMC IP controllers be connected together via RS485?
Short answer - no. Whether you are using APE or AMS, two AMC standalone IP controllers can't be connected together. They are meant to be addressed via separate IP's as individual units. This is valid for "weigand" or "rs485" AMC controllers.
You "can" connect a reader expansion board or Input/Output board to a "weigand" controller. You can only connect an Input/Output board to a "rs485" controller, not a reader expansion board.