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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)