AFAIK the 9448 isn't an eol panel
You also shouldn't wire more than 1 sensor to a circuit
I'd be interested in the photos.
If not eol you can't have a tamper circuit and an alarm circuit on 2 wires.
If it is eol you can't make it work as you will have issues when both detw otrs are active unless you have a 6 core between the detecrors
I assume it's a daisy chain and not 2 wires at the panel?