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Technical Discussion
Charging Circuits
Real-Time Clock (RTC)
Storage of Patient Data
114
pulse beep volume) are used by the N-550B until it is turned off. Default
values will be restored when the N-550B is turned back on.
Patient Data is stored by the N-550B and can be downloaded to a printer
through the data port provided on the back of the N-550B. An in-depth
discussion of the data port is covered in the Data Port Interface Protocol on
page 95.
The power supply will charge the battery any time the N-550B is connected to
AC power. The voltage applied to the battery is 14 ±0.15 volts DC.
Real time is counted by the DS1307 Real-Time Clock. As long as lithium
battery power or AC power is available, the N-550B will keep time. If the
lithium battery is removed, the time clock must be reset.
Whenever the N-550B is turned on, it stores a "data point" in memory every
four seconds (regardless of whether the N-550B is monitoring a patient or
not). Alarm limit changes will also be stored in trend data. The N-550B can
store up to 24 hours of trend data. There are no limitations on displaying or
printing data.
The N-550B trend data will be lost if the battery fails or is removed.
CAUTION : Changing alarm limit settings uses up trend memory space.
Change alarm limits only as needed.
Note: Trend memory always contains the MOST RECENT 24 hours of
data, with newly collected data over-writing the oldest data on a
rolling basis. The N-550B continues to record data points as long as
the N-550B is powered on, with "blank" data points collected if no
sensor is connected to the N-550B or patient. "Blank" data will
over-write older patient data if the memory becomes full. Therefore,
if you want to save old patient data, it is important that you turn your
N-550B off when you are not monitoring a patient before it fills up
and over-writes the old data with new data (or "blank" data).
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