Z Touch-off Puck
From PROBOTIX :: wiki
Retrofiting an existing machine:
Here is the inside of the connector for machines without the ATLaS Tool Length Sensor:
In order to use both the touch-off puck and the tool length sensors, you will need to cut off the existing DB25 connector for the tool length sensor and wire it in to the DB25 connector for the touch-off puck, as seen here: