1.7.2Internal connectors

1.ATX power connectors (24-pin EATXPWR, 4-pin ATX12V)

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.

ATX12V EATXPWR

GND +12V DC

GND +12V DC

B85M-G

+3 Volts

 

 

 

 

 

 

GND

 

 

 

 

 

 

 

 

 

 

+12

Volts

 

 

 

 

 

 

+5 Volts

+12

Volts

 

 

 

 

 

 

+5 Volts

+5V Standby

 

 

 

 

 

 

+5 Volts

Power OK

 

 

 

 

 

 

-5 Volts

PIN 1

GND

 

 

 

 

 

 

GND

+5 Volts

 

 

 

 

 

 

GND

 

GND

 

 

 

 

 

 

GND

+5 Volts

 

 

 

 

 

 

PSON#

 

GND

 

 

 

 

 

 

GND

+3

Volts

 

 

 

 

 

 

-12 Volts

+3

Volts

 

 

 

 

 

 

+3 Volts

 

PIN 1

 

 

 

 

 

 

B85M-G ATX power connectors

•We recommend that you use an ATX 12V Specification 2.0‑compliant power supply

unit (PSU) with a minimum of 300W power rating. This PSU type has 24-pin and 4-pin power plugs.

•DO NOT forget to connect the 4-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.

•If you are uncertain about the minimum power supply requirement for your system, refer to the Recommended Power Supply Wattage Calculator at http://support.asus. com/PowerSupplyCalculator/PSCalculator.aspx?SLanguage=en-us for details.

2.LPT connector (26-1 pin LPT)

The LPT (Line Printing Terminal) connector supports devices such as a printer. LPT standardizes as IEEE 1284, which is the parallel port interface on IBM PC-compatible computers.

LPT

SLCTPEBUSYACK#PD7PD6PD5PD4PD3PD2PD1PD0STB#

PIN 1

B85M-G

GNDGNDGNDGNDGNDGNDGNDGNDSLIN#INIT#ERR#AFD

B85M-G Parallel Port Connector

1-14

Chapter 1: Product introduction