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numeric sequence, alphabetic and numeric sequence, or English and other
languages.  The paper report is an invaluable resource for after-the-fact
investigation and reconstruction of events.
8.4.3.1  Line Printer.  The line printer is a high-speed computer peripheral
that prints a line of text in a single burst and is capable of printing up
to several hundred lines per minute.  This information can be quite bulky
when stored for later review.  Line printer use for a security system is
usually confined to historical report compilation which may burden an
ordinary printer.
8.4.3.2  Other Printers.  The usual report printer associated with a
security system prints at a maximum speed of one line per second and
accommodates 8 1/2-inch by 11-inch paper (or smaller) in continuous form.
The least desirable of these types of printers are the roll or strip
printers, an inexpensive item which limits line length to 16 characters or
less, and which prints data that is difficult to file and reference.
Information on the smaller printers is often in abbreviated or numerical
form which is a compromise in comprehension due to cost.
8.4.4  Visual Reporting.  The devices described below provide report
information regarding alarm system monitoring and control functions.  These
devices usually provide an audible signal to draw attention to the display
and permit silencing of the audible signal (see Figure 52).
8.4.4.1  Alphanumeric Arrays.  The alphanumeric array is a display feature
which consists of relatively simple coded information (three to 16
characters) which differentiates alarm zones.  Best suited to extremely
small applications, this device permits indications of alarms in an economy
of space.  The simplicity of this reporting system does not exhibit features
of prioritization and line security techniques.  This dot matrix, or
light-emitting diode display system, is useful for two to four zone
reporting functions.
8.4.4.2  Cathode Ray Tube (CRT) Displays.  The CRT display is used to
provide reports, operating copy, written copy, and graphic arrangements.
The display element is often part of a video display terminal (VDT) that
permits display and system control functions.  Since the information that is
reported is an output of a processor, there is often much more information
available than in common point alarm indicators.  Instructions to operating
personnel based upon the series of detected events can also be displayed.
8.4.4.3  Graphic Displays.  The video display terminal can also be used for
presentation of graphic information, often in color.  For alarm reporting
systems, floor plans, site plans, and maps can be displayed in colors with
conspicuous representation of zones and areas in alarm.  Specific color
schemes can be indicative of priority or emergency alarms and direct
attention
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