Respironics 920M Betreibershandbuch PDF herunterladen (Seite 23)

Communications 17

Communications

Serial Output

The 920M PLUS provides real-time data output capability via the pulse

oximeter sensor connector (a 9-pin Sub-D connector). The pulse oximeter

sensor connector pin assignments are listed below.

The information from the 920M PLUS in the real-time mode is sent in an

ASCII serial format at 9600 baud with 9 data bits, 1 start bit, and 1 stop bit.

The data are output at a rate of once per second.

Real-time data may be printed or displayed by devices other than the pulse

oximeter. On power up a header is sent identifying the format and the time

and date. Thereafter, the data are sent once per second by the 920M PLUS in

the following format:

SPO2=XXX HR=YYY

where “XXX” represents the SpO

value and “YYY” represents the pulse

rate. The SpO

and pulse rate will be displayed as “---” if there are no data

available for the data reading.

Memory

The 920M PLUS can collect and store up to 72 hours of SpO

and pulse rate

information. Data retrieval software is available for use with Microsoft

Windows

95/98/00 operating systems. Contact your distributor or

Respironics for options.

The memory in the 920M PLUS functions much like an “endless loop” tape.

When the memory fills up, the unit begins overwriting the oldest data with

the new data.

Pulse Oximeter Sensor Connector Pin Assignments

Number

Assignment

1 Battery Voltage

2 Infrared Anode, Red Cathode

3 Infrared Cathode, Red Anode

4 Serial Data, TTL Levels

5 Detector Anode

6 Sensor Type

7 Cable Shield (Ground)

8 Ground

9 Detector Cathode, +5 V

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Respironics 920M Betreibershandbuch Seite 23