Asus KFN4-D16 User Guide - Page 52

POWERLED+ GND POWERLEDMLED+ MLEDNC +5V GND GND SPKROUT HDLED+ HDLEDNMIBTN# GND POWERBTN# GND NC RESETBTN# GND • Power Supply SMBus connector (5-pin PSUSMB1). This connector allows you to connect SMBus (System Management Bus) devices to the power supply unit. Devices communicate with an SMBus host and/or other SMBus devices using the SMBus interface. 9. System panel connector (20-pin PANEL1) This connector supports several chassis-mounted functions. PANEL1 KFN4-D16/SAS KFN4-D16 (Series) System Panel Connector The system panel connector is color-coded for easy connection. Refer to the connector description below for details. • System power LED (Green 3-pin POWERLED) This 3-pin connector is for the system power LED. Connect the chassis power LED cable to this connector. The system power LED lights up when you turn on the system power, and blinks when the system is in sleep mode. • Hard disk drive activity (Red 2-pin HDDLED) This 2-pin connector is for the HDD Activity LED. Connect the HDD Activity LED cable to this connector. The IDE LED lights up or flashes when data is read from or written to the HDD. If an optional SATA add-in card is installed, the read or write activities of any device connected to the SATA add-in card causes this LED to light up. • System warning speaker (Orange 4-pin SPKROUT) This 4-pin connector is for the chassis-mounted system warning speaker. The speaker allows you to hear system beeps and warnings. 2-32 Chapter 2: Hardware information