User manual

F4-BMS 2.0 Technical Manual

Data Bit

Name

Enum Mask Location Functional Description

WOW 0x10 lightBits Weight on Wheels (WOW). This value is “on” if the

aircraft is on the ground, the landing gear is in the

down position and there are no faults in the landing

gear system. Otherwise, the value is “off”. There is

one value for all three gear struts (the real F-16 has a

WOW switch for each separate strut).

AutoPilotOn 0x40000000 lightBits Autopilot engaged. This value is “on“ if the pitch

mode control switch on the MISC panel is in either

the ATT HLD or ALT HLD positions. The real jet

uses a magnetically captured three place toggle

switch for this control in the MISC panel. The switch

bat snaps to center (OFF) position if the magnetic

coil in the switch is not energized. Use this bit to

energize that coil if your switch has that capability.

Note: technically, there are certain conditions under

which the AP will not be engaged and funcitoning

even when the switch is still captured (for example if

you exceed roll or pitch limits during AP operation).

Thus the bit here only really indicates whether the

switch should be held out of the OFF position by the

magnetic coil or not.

TFR_STBY 0x80000000 lightBits TFR powered but not engaged. The TFR

implementation in Falcon4 isn’t totally complete. The

actual STBY light works a little differently. In Falcon4

this light, the lower half of the split-face indicator

pushbutton in the ADV MODE position on the MISC

panel is on whenever there is electrical power

available and the terrain following autopilot mode is

not engaged.

Power_Off 0x1000 lightBits3 No electrical power flowing. This bit is not used to

drive any lamp output. Rather it is a pure state flag

to indicate whether the avionics and other systems

attached to the various electrical buses are receiving

power. This bit is only on if no power is available, i.e.

the engine is not operating and the generators (main

and standby) are not online. This can be useful in

some cases to support controller logic that drives

lamp bits for cockpit hardware that has no actual

state bits in the shared memory area (i.e. supress

any lamp from being on if there is no power in the