Digital Input

[Vaughan2024]

My problem is I have some inputs I can connect directly to the digital inputs on the KC868-A8 but I have some inputs that are shared with an alarm panel they are alarm sensors, Previously they were connected to an Arduino to the digital input with a sheared common ground, Worked fine.

But I can't connect them to the KC868-A8 digital inputs because it can't accept the low signal.

Is there an expander that will allow me to connect the low level signal inputs with shared common ground? 


Thanks