Datex-Ohmeda S/5 Compact Anesthesia Monitor, Technical Reference Manual

Page: 22 / 72

Datex-Ohmeda S/5 Compact Anesthesia and Critical Care Monitor
2.5 Software loading
The program memory on Central Processing Board is loaded with monitor software at the factory. The
software is used for running all the functions that are integrated into the board. For service and upgrade
procedures the Central Processing Board is fitted with a PCMCIA card drive through which new software can
be loaded.
2.6 Parameter modules
Mod
ule Bus
Pat
ient i
sol
at
io
n
Isolation
transformer
+15 V
Opto isolation
RS485
drivers
Data
Reset
+5 V
±12 V
CPU
Module
keys
Analog
electronics
A/D converter
RAM
EEPROM
Peripheral
drivers
Pa
tient
Module
keys
Module
keys
The detailed structure of a parameter module
depends on the specific needs for each individual
parameter. However, some common parts are
used in the parameter modules. The electronics
inside the module is usually divided into isolated
(floating) and non-isolated sections. Typically, the
non-isolated section consists of buffers to
interface the parameter module to the module
bus while the rest of the electronics is located in
the isolated section. The isolated section includes
the microcontroller together with memory
components, the front-end analog electronics
(amplifiers, etc.) and peripheral drivers to control
LEDs, sensors, valves and pumps.
Figure 4 General structure of parameter modules
Document No. M1031508
12