Campbell Scientific PC208 Datalogger Support Software - Manual (Page 52)

SECTION 3. GRAPHTERM
3-8
were used and is automatically re-loaded when
the monitor mode is entered. Multiple screen
configurations may be saved under multiple
Graph Setup Files. Enter *<Enter> to list the
files.
To automatically load a particular graph
specification, the Graph Setup Filename can be
entered as a command line parameter after the
"L" command (Section 5).
Graphing Interval: Specifies how often to
update the graph with input storage data in
seconds. All graphs use the same interval.
Entering "0" will put GraphTerm into an auto-
detect mode where the graphing interval is
automatically adjusted based on how often the
data is changing. The first ten samples of
changing data are used to determine this
interval. If the hardware including the
communications links cannot keep up with the
datalogger, GraphTerm will automatically adjust
the graphing interval to the closest even
second. Manually setting the interval to from 1
to 900 seconds allows control of how much time
is represented on the X-axis of the graphs.
Bar Graph Pixel Width: Provides a means for
setting the width of the bars on the graph. The
default value is 6, and the legal settings include
0 to 38 pixels. Bars greater than 7 pixels get
labeled with the first character of the location
label; above 17 pixels with 2 characters; above
25 pixels with 3 characters; and above 33 pixels
with 4 characters. The default setting of 6
pixels allows the bars to be thought of as "pens"
on a strip chart to help identify each data trace.
There is only one pixel setting for all graphs.
The remaining parameters are repeated for
each of the graphs.
Graph Type: Defines whether Auto or Fixed
scaling is to be applied to the graph. The
default setting is Auto, which stands for auto-
scaling mode. In this mode, all parameters are
graphed between an upper and lower limit that
disregards the power of ten of the data point.
For example, suppose you were graphing 2
points, one ranges from 32.0 to 50.0 and the
second from 645.0 to 995.0. In Auto mode, with
the upper and lower limits left at their default
settings of +10.0 and -10.0 respectively,
parameter one would be plotted between 3.2
and 5.0; parameter 2 would be scaled between
6.4 and 9.9.
With fixed scaling, values are plotted against
the absolute scale that is defined by the values
entered for Upper and Lower Limits.
Locations: Specifies which locations are to be
digitally displayed and graphed. The maximum
number of locations that can be displayed per
graph is 11. The number graphed (see below)
is a subset of this list and is specified as the
number of locations beginning at the top of the
list to graph. Therefore it is important to list the
locations that you wish to graph and digitally
display first, followed by the locations that will be
digitally displayed only.
A list of the selected input locations with labels
(assigned in EDLOG) is displayed at the right
side of the screen. Use the "F1" and "F2" keys
to display and scroll the list of all available
locations.
Continuous locations may be specified by the
first number then two periods and the last
number. For example, 1..11 would display the
first 11 Input locations, or 1..4,7..9,22..25 would
display locations 1 through 4, 7 through 9 and
22 through 25. Individual locations can be
strung together with commas (e.g.
1,7,23,4,66,3,21,33).
Number Graphed: This setting controls the
number of input locations, beginning at the start
of the list as specified in "Locations:", to graph.
Lower Limit: Sets the lower limit for the graph
defaults to -10). The allowable (non zero) range
is
± 0.0001 to ± 100,000 with 2 digits of
resolution. This setting is used in both Auto and
Fixed scaling modes.
Upper Limit: Sets the upper limit for the graph
defaults to 10). The allowable (non zero) range
is
± 0.0001 to ± 100,000 with 2 digits of
resolution. This setting is used in both Auto and
Fixed scaling modes.
3.4.8 V
−−−−
VIEW SAVE TO FILE
Saves the current graph display as a file named
MONSCR.000 with the extension incremented
each time a new screen is saved. The screen
image is saved in a compacted format that
requires between 8K and 30 Kbytes of disk
space. This function takes about 30 seconds
when running on a 20 MHz 386 PC. The disk
drive light stops flashing when the function is
complete. Pressing ESC aborts the function.