Datex-Ohmeda S/5 B-GAS, Technical Reference Manual

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Datex-Ohmeda S/5 Anesthesia Monitor
Document No. 800 1005-1
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2.2.8 Gas mother board
The Gas mother board controls power supply to each measuring unit, as well as the serial
communication between the units and the module processor. There are connectors for the pump,
valves and gas measuring units on the board. The board contains a processor which controls the
functions within the module.
The tasks of the module processor are:
•
to receive commands from the main CPU board and pass them on to Measuring boards.
•
to gather measurement results from the Measuring boards, analyze them, and transmits
data to the main CPU board.
•
to control the valves and pump based on the data which ACX Measuring board transmits.
Main parts
•
Module processor 80C196KC/16 MHz
•
16 MHz oscillator
•
EPROM program memory
•
External RAM memory
•
EEPROM
•
Address and data bus latch
•
Address decoding GAL-circuit
•
4-channel serial communication IC (QUART, D4)
External communication
Serial communication bus inside the module processor is used. The bus is connected to module
bus via RS-485 buffer. Transmit and reception controls of buffer are controlled by the processor.
Connections to measuring boards
Data collection from the measuring units takes place in serial communication bus. Serial
communication lines of the measuring units are connected to QUART IC on the Gas mother board;
Channel 1 - ACX, channel 2 - ASX, channels 3 - PVX, channel 4 - not in use). The transmit side of
QUART has a buffer IC and the receipt side has a pull-up resistor.