Asus Desktop Barebone Pundit P3-PH5 - Manual (Page 58)

-10 Chapter 4: Motherboard info
8. Chassis intrusion connector (4-1 pin CHASSIS)
This connector is for a chassis-mounted intrusion detection sensor or switch.
Connect one end of the chassis intrusion sensor or switch cable to this
connector. The chassis intrusion sensor or switch sends a high-level signal to
this connector when a chassis component is removed or replaced. The signal
is then generated as a chassis intrusion event.
By default , the pin labeled “Chassis Signal” and “ Ground” are shorted with
a jumper cap. Remove the jumper caps only when you intend to use the
chassis intrusion detection feature.
R
P5B-V
M
P5B-VM Chassis Intrusion Connector
CHASSIS
+5VSB_M
B
Chassis Signal GND
(Default)