User's Manual

Table 3-3 WOW Pin Wiring
Pin Name and Location
WOW1 WOW2 PGM
Aircraft Status
TP3G TP3K TP3J
CLOSED CLOSED CLOSED In-air
OPEN CLOSED CLOSED Not valid—Default in-air
CLOSED OPEN CLOSED Not valid—Default in-air
OPEN OPEN CLOSED On-ground
CLOSED CLOSED OPEN On-ground
OPEN CLOSED OPEN Not valid—Default in-air
CLOSED OPEN OPEN Not valid—Default in-air
OPEN OPEN OPEN In-air
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
eNfusion® HSD-440 Mark 2 Terminal
23-15-30 3-7
3 JUN 10
WOW discretes indicate when an aircraft is
on the ground and are used for flight
data-logging purposes. Since data that the aircraft is airborne is supplied to the
HSD-440 Mark 2 Terminal by other equipment, this information from the discretes is
not required. WOW is only used to determine aircraft on-ground status, if the Inertial
Reference System (IRS) has no valid data, and the CMC is not installed, or if the
CMC is not providing valid data.
The function of WOW can inhibit RF transmissio
n when the aircraft is on the ground.
This function is disabled by default and must be enabled through the ORT parameter
TRANSMIT ON GROUND—see "Configuring Transmit on Ground" on page 6-27.
NOTE: If the WOW function is disabled, do not perform normal maintenance when
the system is active to avoid RF exposure. Follow normal safety procedures
and disable the system before performing antenna maintenance.
(5) ICAO IDs
TheHSD-440 Mark 2 Terminal requires an ICAO ID to op
erate and access classic
services. The HSD-440 Mark 2 Terminal receives the ICAO ID either from discrete
strapping or from an ARINC 429 source as determined by the ICAO CODE SOURCE
ORT parameter—see "Configuring the ICAO Code Source" on page 6-15.
Figure 3-2 provides an example of a strapped ICAO ID address. This number (for
example: Decimal 11256099, Hex ABC123, or
Octal 52740443) must be converted
into a binary number for strapping.
NOTE: MSB is the Most Significant Bit and LSB is the Least Significant Bit.