FUJITSU ErgoPro m664 - Manual (Page 28)

ErgoPro m664-series PC Specialist's Handbook
Page 2-6 Edition 1 - Release 1 - March 1998
Front panel I/O connectors
The front panel connector includes headers for the following I/O connections:
Speaker
The speaker is enabled by a jumper on pins 26-27 of the front panel connector. The onboard speaker can
be disabled by removing the jumper, and an offboard speaker can be connected in its place. The speaker
(onboard or offboard) provides error beep code information during the POST in the event that the
computer cannot use the video interface. The speaker is not connected to the audio subsystem and does
not receive output from the audio subsystem.
Reset
This header can be connected to a momentary SPST type switch that is normally open. When the switch
is closed, the system board resets and runs the POST.
Power LED (/Sleep/MessageWaiting)
This header can be connected to an LED that will light when the computer is powered on.
HDD 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 hard drive. 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 SCSI hard drive
LED header.
Infrared
Serial Port 2 can be configured to support an IrDA module connected to this 6-pin header. After the IrDA
interface is configured, files can be transferred to or from portable devices such as laptops, 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:
•
Optional front panel sleep/resume button
•
Prolonged system inactivity using the BIOS inactivity timer feature
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 system 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. To reactivate or resume the system, the sleep/resume switch must be pressed
again, or the keyboard or mouse must be used.
Power On
This header can be connected to a front panel power switch. The switch must pull the SW_ON# pin to
ground for at least 50 ms to signal the power supply to switch on or off. (The time requirement is due to
internal debounce circuitry on the motherboard.) At least two seconds must pass before the power supply
will recognize another on/off signal.