Respironics 920, Instruction And Service Manual

Page: 27 / 52

19
English
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
2
and pulse rate LEDs;
3) Observe “ Prn xx” will be displayed in the SpO
2
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.