Hill-Rom Advanta P1600, Service Manual

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ZoneAire® Sleep Surface Software Theory of Operation
Chapter 3: Theory of Operation
Page 3 - 36 Advanta™ Bed Service Manual (man168ra)
Communication between the controller circuit and the footboard control panel
is via LON communications protocol through a single pair of wires utilizing
RS485 medium standard. Communications between the controller circuit and
the pressure sensing circuit is via a 25 pin D-sub cable, utilizing 3-wire,
synchronous, serial, bi-directional communications (along with other discrete
lines, and AC and DC power).
General Description
The ZoneAire® Sleep Surface is an air-inflated, multi-functional, automatic
sleep surface used in conjunction with hospital patient beds. The system
functions are separated into several modes of operation.
The pressure relief mode is designed to minimize and uniformly distribute
interface pressures between a patient and the sleep surface.
Three heel relief modes further reduce heel-to-sleep surface interface pressure
and can accommodate a wide range of patient heights.
The auto firm mode inflates the mattress to a high pressure to aid in transfer of
patients to and from the bed.
The CPR mode inflates the sleep surface to a high pressure to provide a firm
surface should CPR need to be performed on a patient.
Software algorithms are included to provide limited self-diagnostics to reduce
the probability of unknowingly operating in a degraded state and/or reduce
durability of components. Software algorithms, which can be activated through
the footboard control panel, are also included to aid in troubleshooting.
Reset
A reset can happen two ways. A reset is initiated when power is applied to the
Neuron micro controller, and when a Neuron watchdog timer expires.