Respironics 920M Service Manual download pdf (Page 27)

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2. Memory Output Mode

To output the data stored in the memory of the 920M, start with the

unit OFF and then:

1) Hold the “ñ” switch while pressing the “” switch;

2) Release the “ñ” and “” switches when “888 888” is

displayed in the SpO

and pulse rate LEDs;

3) Observe “Prn xx” will be displayed in the SpO

and ♥

LEDs;

4) Data is automatically transferred from the memory in

approximately 8 to 10 minutes.

Data is transferred at a rate of 20 minutes of collected data per

second. An 18 hour recording session (the maximum memory

saved) is transferred in approximately 1 minute. After all the data is

transferred, the 920M should be shut off prior to collecting new

patient data. The patient information is held in memory as long as

the batteries are good, so if the memory has to be cleared, remove

the battery door for a period of 60 seconds or longer. Outputting the

memory does not clear any data from the memory.

NOTE:

The memory is cleared each time the batteries

are changed.

The format of the data transferred is given in Table IV. The size of

this file will depend on the amount of data saved in the memory.

The most recent data is transferred first. The memory data format is

in binary. Bad data is represented by FF (hexadecimal) or 255

(decimal). If the memory “wrapped around” (the recording time

exceeded 18 hours) and the final (i.e., the oldest) file of data has

been truncated, the final start time will be represented by zeroes

and the start times for that file will then not match up.

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Respironics 920M Service Manual Page 27