The keypad controller is a tiny PCB with a 4 pin connector.
It is designed to physically fit inside the case of a Honeywell Galaxy alarm panel keybad. There is space in the case at the bottom.
You need to solder wires to the back of the PCB for GND, DC, A, and B. These connect in the same order to the 4 pin header.
The keypad then needs normal power on its screw terminals, but does not have anything connected to its A/B contacts as the keypad controller talks to it directly.
The board also has a simple RGB LED which can be used to indicate status.
Note: Whilst most modules have moved to using Pheonix Contact connectors, they are too big for the space in the keyboard, so this is supplied with a mini SPOX connector, plug and flying leads to solder to the keyboard PCB.
In situ in Galaxy keypad
