Nellcor N-200 Operator's Manual page 45

Guide to Operation
See the Connecting to Other Instruments section for further
information on available formats.
Printing Trend Data: Data in the trend memory may be
printed graphically on a Hewlett-Packard ThinkJet printer
with an RS-232 serial interface (model 2225D), or on an analog
strip-chart recorder, or by using a NELLCOR N-50 powerbase/
display module. Trend data may also be output in ASCII form
to a printer or computer. To print the contents of trend
memory, the N-200 must be connected to AC power. The
instrument continues to function as a monitor while the trend
data is being printed. The data is retained in memory after
printing, unless they are erased as described at the end of this
section.
Using a ThinkJet Printer: Set up the printer and connect it
to the N-200 rear-panel SERIAL COMM connector according to
the instructions in the Connecting to Other Instruments
section. To print trend data in graphic form, set the N-200
RS-232 format switches to graphics mode I or II as described in
the same section. In graphics mode I (high resolution) or
graphics mode II (low resolution), select either by setting the
RS-232 format switches appropriately. Low resolution produces
a graph that contains one data point for every 50 seconds of
saturation and pulse rate data; high resolution produces a
graph that contains one data point for every 5seconds of
saturation and pulse rate data. Press the TREND button on
the back of the N-200 to begin printing.
When trend data is printed on a ThinkJet printer, up to
12hours of data is printed on one page, with the earliest data
in the top left portion of the page. When low resolution is used,
each point on the printout represents 50 seconds. When high
resolution is selected, the graph will necessarily be more than
one page as each dot represents 5 seconds.
The oxygen saturation scale is automatically selected, based on
the range of the data: the maximum value is always 100%; the
minimum value is 50%, 25%, or 0%. The pulse rate scale is 0 to
250 beats per minute (a narrower range is automatically
selected if the data is suited to it.) Time (date, hour, minute) is
presented along the horizontal axis.
39