Datex-Ohmeda S/5 Anesthesia Monitor
Document No. 800 1005-1
18
2.2.4
ACX measuring board
The measuring electronics can be divided into a few functional blocks, which are described below
(see the block diagram in figure 11).
The ACX Measuring board controls gas measurements. It converts the photometer signal into digital
data, calculates results and transmits it to Gas mother board. The board contains, in addition to
the 80C51FA processor, EPROM, RAM, and EEPROM, several analog and digital I/O functions.
Internal and external bus
The processor has access to the Measuring board peripherals (memory, A/D converter, D/A
converters, etc) via an internal bus. For communication between the Gas mother board and the
Measuring board, there is an external bus in connector X1.
Memory
Memory components include 64k
×
8 bit EPROM program memory, 32k
×
8 bit low current CMOS
RAM, and EEPROM for permanent calibration values and setup memory.
Summary of Contents for S/5 B-GAS
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