Standby And Display Unit Power Down; Watchdogs - GE Datex-Ohmeda S/5 Series Technical Reference Manual

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Programmable alarm sound generator
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PC-card slot for software updates

2.1.1 Standby and Display Unit power down

When the monitor is turned to standby, NMI-interrupt is generated by the control logic. The
interrupt signal in the Central Processing Board means that all the outputs from the CPB are
switched off (i.e. display, alarm leds, etc.). The CPU section processor enters the HALT state.
During the Halt state the DRAM refreshing cycle continues to occur, thus saving trend and
patient data and user settings stored in the DRAM. After 15 min. the Power Management Board
(in the Frame Unit) cuts of the Display Unit voltage.
If the monitor is restarted within 15 min. of the last power off, a Warm Start is performed
(trends and temporary settings will be available). If the monitor is restarted after 15 min. of the
last power off, a Cold Start is performed (trends and temporary settings will be erased).

2.1.2 Watchdogs

There are certain watchdog functions to ensure the monitor's performance. The UPI interrupts
the CPU continuously in order to tell that everything runs smoothly. If this watchdog fails, the
UPI section is initialized. The monitor is not reset.
The CPU section has its own watchdog in order to ensure that the main software functions
normally. In software overload situation the watchdog is not refreshed, and the monitor is
reset.
The Central Processing Board (the CPU section) communicates with the Power Management
Board in the Frame Unit. This communication is also used as a watchdog signal between CPB
and PMB.
2 serial channel signals in RS232-level
Display Unit for F-CM(C)1 (Rev. 05), F-CM(C)REC1 (Rev. 01)
Document no. M1144956-003
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