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UOJ284 Graphical Data Displays This software package provides two means of displaying data graphically--maps and XY graphs. Maps can be easily drawn, using cursors, to represent a given geographical area and dis.tinguishing features, such as rivers, lakes, boundary lines, etc. On it can be placed the location of the various remote sensors in this area. The display will then show the value of the sensor reading at each loca- tion in real-time. In other words, the display will update itself as the conditions at the sensor change. Thus, this display is one of the most useful because conditions in an entire area can be monitored at a glance. An example, using the color monitor option, is shown in Figure 13. A large number of these maps can be stored in the computer and quickly called up by name using the MACRO feature. Another useful graphical display is the XY graph. A sensor readin.g can be plotted versus time and will update itself as the sensor value changes. A very useful example is a plot of water level, or stream flow rate with time. This graph, shown in Figure 14 shows a typical hydrograph of a rising river level in current time. It is possible; as the plot reaches the end of the graph, to scroll the X, or time axis, to keep the plot on screen. Again, graphs of this type can be stored and instantly called up by name using the MACRO feature. Using the 547B Base Station all graphs can be plotted in color. Up to sixteen different colors may be used for the graph itself plus ti tles and borders. Alarm Management Alert Software also provides a versatile alarm Each sensor can be assigned alarm limits in the when the limits are exceeded a tone will sound and " a message will be displayed on the CRT or printer. The alarm also functions automatically when the remote station battery voltage falls below a predetermined value to warn of battery discharge. The Enhanced management system. software such that Alarm limits can be set for a maximum or minimum value and posi- tive and negative rates of change of a sensor, including threshold limits. that must be exceeded in addition to the rate of change limit. For example, rainfall or river level rates of increase may be set, as well as maximum water levels, that will caUSe an alarm at the base station when any of these limits are exceeded. In addition all alarms are logged into a file so that they may be later displayed and ana- lyzed. An example of the alarm log file is shown in Figure 15. 21