Anti-tamper Alarm
The K401-EW’s alarm trigger is activated by an LDR (Light Dependant Resistor) which is located to the lower
side of the unit as illustrated below using the K401-E
The alarm function is designed as an ‘Anti-Theft’ facility. Forceful removal of the installed keypad or a sudden
change in light source will trigger the keypad to bleep constantly. The keypad will also be “Blocked” from use
The function cannot be disabled but it can be stopped by presenting a valid card or key fob to the reader or
entering the Master Code followed by the # sign
Alternatively, you can prevent the alarm from future activation by covering the LDR with a non-light absorbent
substance in addition to sealing around all edges of the keypad
This is the LDR (Light
Dependent Resistor). The
LDR is the K401-I’s Alarm
Trigger Sensor and activated
by light
