NEC POWERMATE PROFESSIONAL 9000 Service Manual page 261

A-26 Connector Pin Assignments
Hard Drive LED
This header can be connected to an LED to provide a visual indicator that data is being read
from or written to an IDE or SCSI hard drive, as well as add-in cards that provide an
activity signal. For the LED to function properly, the IDE drive must be connected to the
onboard IDE controller. This LED will also show activity for devices connected to the hard
drive LED header.
Infrared Connector
Serial Port 2 can be configured to support an IrDA module connected to the front panel
infrared connector (not installed). After the IrDA interface is configured, files can be
transferred to or from portable devices such as laptop computers, PDAs, and printers using
application software.
Sleep/Resume Switch
When APM is enabled in the system BIOS, and the operating system's APM driver is
loaded, the system can enter sleep (standby) mode in one of the following ways:
T
Optional front panel sleep/resume button (not installed)
T
Prolonged system inactivity using the BIOS inactivity timer feature (see "Power
Menu" in Section 2 for a description of power management modes).
The 2-pin header located on the front panel I/O connector supports a front panel
sleep/resume switch, which must be a momentary SPST type that is normally open.
Closing the sleep/resume switch sends a System Management Interrupt (SMI) to the
processor, which immediately goes into System Management Mode (SMM). While the
computer is in sleep mode it is fully capable of responding to and servicing external
interrupts (such as an incoming fax) even though the monitor turns on only if a keyboard or
mouse interrupt occurs. The yellow LED lights when the computer is in sleep mode. To
reactivate or resume the system, the sleep/resume switch must be pressed again, or the
keyboard or mouse must be used.
Table A-36 Power/Sleep LED States
LED State Indication
Off Power off
Green Power on
Yellow Sleep