Dräger Savina 300 Technical Documentation Manual page 14

Function descriptions
Electronic assembly
14
Front processor
The front processor has the following tasks:
– Interface with the display processor
– Monitoring of the master processor and display processor
– Monitoring of the input logic and the data e.g. the pixel sum
The RAM caches data from the front processor.
The EEPROM with socket of the front processor stores safety parameters,
set values such as volume, software options and the operating hours.
Display processor
The display processor has the following tasks:
– Presentation of curves and parameters on the display, LEDs
– Input and operator data (keyboard, rotary encoder, touchscreen)
– Collation of data such as the pixel sum.
The EEPROM of the display processor stores user-specific display settings,
such as measured value positions.
Flash EEPROMs
The device's operating system program (software) is stored in Flash
EEPROMs (rewritable memory modules).
Real-time clock
The real-time clock generates the time and date information. The real-time
clock has an internal battery.
The Central Control Board incorporates the following functions:
– Processing of the signals from the sensors (O2, flow, pressure, tempera-
ture)
– Control of the blower and valves
– Monitoring of the unit functions and the supply voltages
– Actuation of the displays
– Keypad interpretation
– Provision of the internal and external interfaces
– Set values such as the volume
Mains power failure alarm
If the mains power fails, the device switches to the internal batteries which
supply the device with power. If the internal batteries are discharged and the
device has no external batteries, an acoustic alarm is sounded with a Gold-
Cap and a horn.
Savina 300