Asus P7H55-M SI - Manual (Page 22)

4. CPU and Chassis fan connectors (4-pin CPU_FAN, 3-pin CHA_FAN)
Connect the fan cables to the fan connectors on the motherboard, making sure that the
black wire of each cable matches the ground pin of the connector.
DO NOT forget to connect the fan cables to the fan connectors. Insufficient air flow inside
the system may damage the motherboard components. They are not jumpers! DO NOT
place jumper caps on the fan connectors.
P7H55-M SI
P7H55-M SI fan connectors
GND
CHA FAN PWR
CHA FAN IN
CHA_FAN
CPU_FAN
CPU
FA
N PWM
CPU
FA
N IN
CPU
FA
N PWR
GND
5. Chassis intrusion connector (4-1 pin CHASSIS)
This connector is for a chassis-mounted intrusion detection sensor or switch. 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.
+5VSB_M
B
Chassis Signal GN
D
CHASSIS
P7H55-M SI Chassis intrusion connector
P7H55-M SI
Chapter 1: Product introduction 1-12