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Communications

Serial Output

The Model 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.

Information from the device, 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.

NOTE: The 9th data bit is used for odd parity in memory download. In

real-time mode, it is always set to the mark condition. Therefore,

real-time data may be read as 8 data bits, no parity.

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 date and time. Thereafter, the data are sent once per second 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.

Pulse Oximeter Sensor Connector Pin Assignments

Number Assignment

1-Wire

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 No Connection

9 Detector Cathode, +5 V

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Respironics 920M Betreibershandbuch Seite 28