Asus H81-Gamer User Manual page 23

2. Serial port connector (10-1 pin COM)
This connector is for a serial (COM) port. Connect the serial port module cable to this
connector, then install the module to a slot opening at the back of the system chassis.
H81-GAMER
H81-GAMER Serial port (COM) connector
3. EATX power connectors (24-pin EATXPWR, 8-pin EATX12V)
These connectors are for ATX power supply plugs. The power supply plugs are
designed to fit these connectors in only one orientation. Find the proper orientation and
push down firmly until the connectors completely fit.
H81-GAMER
H81-GAMER ATX power connectors
• For a fully configured system, we recommend that you use a power supply unit
(PSU) that complies with ATX 12 V Specification 2.0 (or later version) and provides a
minimum power of 350 W.
• DO NOT forget to connect the 4-pin/8-pin ATX +12V power plug. Otherwise, the
system will not boot up.
• We recommend that you use a PSU with higher power output when configuring a
system with more power-consuming devices or when you intend to install additional
devices. The system may become unstable or may not boot up if the power is
inadequate.
ASUS H81-GAMER
COM
PIN 1
A
A
EATX12V
PIN 1
+3 Volts
+12 Volts
+12 Volts
+5V Standby
B
Power OK
+5 Volts
+5 Volts
+3 Volts
+3 Volts
B
EATXPWR
GND
+5 Volts
+5 Volts
+5 Volts
-5 Volts
GND GND
GND
GND GND
PSON#
GND GND
-12 Volts
+3 Volts
PIN 1
1-15