User's Manual

Page 3–14
18 September 2007
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
eNfusion™ HSD-128 High-speed Data Terminal
• AFG: Airframe DC Ground
• FAC: Fwd Address Common (TP7K)
Resolve any conflict between WOW1 and WOW2 by assuming the aircraft is
“in-air.” The interpretation of the state of the WOW1 and WOW2 pins is defined
by the state of the WOW program select pin. Refer to
Table 3–4 for details.
1. Stand-Alone Mode Installations
Labeled as WOW1, WOW2, and WOW Program Select, these discretes are
wired only if equivalent information is not strapped as being available to the
SDU on an ARINC 429 input [for example, IRS or the Centralized Fault
Display System (CFDS)].
WOW wiring is optional for system operation in Stand-Alone Mode
installations as the HSD already receives speed information for Doppler
correction. However, if WOW wiring is not wired, normal maintenance must
be disabled when speed or Doppler readings are greater than zero.
(e) Forward and Return Address IDs – Stand-Alone
Figure 3–3 provides an example of a Forward ID address. The Forward ID is a
Hex number (example: $ABC123) that must be converted into a binary number
for strapping.
Table 3–4. WOW Pin Wiring Table
Pin Name and Location
WOW1 WOW2 PGM
Aircraft Status
TP3G TP3H TP3J
AFG AFG FAC In-air
OPN AFG FAC Not valid – Default in-air
AFG OPN FAC Not valid – Default in-air
OPN OPN FAC On-ground
AFG AFG OPN On-ground
OPN AFG OPN Not valid – Default in-air
AFG OPN OPN Not valid – Default in-air
OPN OPN OPN In-air