Asus A7V333 User Manual page 53

22) Chassis Open Alarm Lead (4-1 pin CHASSIS)
This lead is intended for a chassis designed to support intrusion detection.
The lead requires an external detection mechanism such as a chassis
intrusion monitor/sensor or microswitch. When any chassis component is
removed, the sensor is triggered and a high-level signal is sent to this lead to
record a chassis intrusion event. The event is then be processed by software
such as LDCM. When not using the chassis intrusion lead, place a jumper
cap over the pins to close the circuit. Removing the jumper cap will prevent
the system from booting up.
CHASSIS
A7V333
®
A7V333 Chassis Alarm Lead
ASUS A7V333 motherboard user guide 41