Asus M4A78LT-M - Manual (Page 39)

9. CPU and chassis fan connectors (4-pin CPU_FAN and 3-pin CHA_FAN)
Connect the fan cables to the fan connectors on the motherboard, ensuring that the
black wire of each cable matches the ground pin of the connector.
Only the 4-pin CPU fan connector supports the ASUS Q-Fan feature.
DO NOT forget to connect the fan cables to the fan connectors. Insufficient air flow inside
the system may damage the motherboard components. These are not jumpers! DO NOT
place jumper caps on the fan connectors.
M4A78LT-M
M4A78LT-M fan connectors
CPU_FAN
GN
D
CPU
FA
N PW
R
CPU
FA
N IN
CPU
FA
N PW
M
Rotation
+12V
GND
CHA_FAN
10. Serial port connectors (10-1 pin COM1)
The connector is for a serial (COM) port. Connect the serial port module cable to the
connector, then install the module to a slot opening at the back of the system chassis.
The serial port bracket (COM1) is purchased separately.
M4A78LT-M
M4A78LT-M Serial port (COM1) connector
PIN 1
COM1
ASUS M4A78LT-M 1-29