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POWER: the XPNDR RCVR always draws battery power,
& only battery power.... to avoid battery drain,
keep checkouts short. The "power-saving"
mode powers only the SPAS lights & RCVR.
(Lock is req'd to apply rest of pwr)
The Housekeeping box gets switching commands from
the DHS - either DCU or MODUS:
[[Diagram]][[right margin]]paths to load are different[[/right margin]]
Note: All commands sent to the DCU are thought
by the MODUS to be fail commands. ∴ while
MODUS is still up, [[strikethrough]]every/strikethrough]] only the first cmd sent to DCU will bring with it a message: "SPAS DHS", and a cmd word FAIL
Undervoltage circuitry: any cell of a battery <1.1V
trips that battery off (it can be reset with
a "BATT A(B)-ON" input, but will trip again if
U/V is still present)