HN440 USER’S GUIDE
2 8 I n s t a l l a t i o n
assumes the switch is open when the chassis is closed. The
Heceta II can detect an intrusion even when AC power is
disconnected (the logic is powered from the backup battery).
Pin
Description
1
Switch input
2
Signal ground
Front panel header strip (item 3 on page 10) providing a
range of connectors for various functions [pin numbers shown
in square brackets]:
Power button connector [1-2]. Connector for the lead
from the chassis Power button. Note that this requires
the use of a logic-controlled Power Supply Unit. The
button may be configured as a simple on/off button or as
a suspend/resume button in the BIOS Setup utility. The
suspend/ resume functionality also requires an ACPI-
aware operating system such as Windows 98.
Hard disk activity LED connector [13-16]. 4-pin
connector for the lead to the chassis’ hard disk drive
activity LED. Read and write activity on the primary
IDE interface cause the LED to light.
Power LED connector [18-20]. 3-pin connector for the
lead to the chassis’ power LED. A standard LED
illuminates when the computer is powered on. A two-
colour LED can also indicate when the computer is in a
power-saving Suspend mode.
Reset button connector [22-23]. 2-pin connector for
the lead from the chassis’ Reset button. This button
allows you to reboot the system without cycling the
power supply.
Internal speaker connector [24-27]. 4-pin connector
for the lead to a chassis-mounted PC speaker.
Message LED connector [29-30]. Connector for a lead
to a LED that signals whether a message has been
received from a fax/modem. This functionality requires
an ACPI-aware operating system such as Windows 98.
