The ASL 210 Adjustable Beam Switch with 3 Pin Connector projects an invisible beam of light.  When mounted above the ASL 105 Electronic Head Array the switch functions as a passive stop switch and a reset switch.  It is configured in a normally closed setting and activation occurs when the head is moved beyond the adjusted sensing range.  A setscrew on the barrel of the switch allows the activation range to be adjusted up to a maximum distance of fifteen inches.  The 3 pin connector plugs directly into an ASL 151 Interface.