Red Lion LEGEND - Manual (Page 11)

OVERFLOW INDICATION
The unit flashes the word “OVERFLOW” (or assigned mnemonic) in the
appropriate display when an overflow condition occurs. An overflow occurs
if the capacity of the display (6-digits) is exceeded or if the internal count
capacity (9-digits) is exceeded. The use of an extremely small Scale
Multiplier and Scale Factor value can cause the internal count capacity to
overflow before the displayed value overflows.
For example, if a Scale Factor of 0.0001 and a Scale Multiplier of 0.001 is
used, for every 10,000,000 count edges received, the display increments by 1.
Before the display reaches 215, the internal counter overflows. When the
capacity of the display is exceeded, the count value is maintained and is valid.
If the internal count capacity is exceeded, the count value is no longer valid.
Use of a Scale Factor larger than “1” can cause the count display to
overflow before 999,999 internal counts are accumulated. The use of a Rate
Scale Factor, Scale Multiplier, and Rate Conversion Factor larger than “1”
can cause the rate display to be in an overflow condition.
The counters should not be allowed to operate in an overflow condition. As
soon as, or before the counters overflow, the information should be recorded
and the counters reset.
PEAK & VALLEY
The Peak and Valley registers record the lowest (Valley) and the highest
(Peak) readings of the rate input signal. These values are viewed in the
indication display loop and are updated automatically. A User Input can be
programmed to reset the values to the current rate value individually or by
sending the proper command via the serial communication port. The Peak and
Valley values are NOT retained when power to the unit is removed.
NORMAL OPERATING MODE
In the normal operating mode, the up, down, left, and right arrow keys are used
to scroll through the main display loop. In the main display loop, the four
indication displays, scale factors, and program mode modules are viewed, as
shown below. In the indication display loop, the up and down arrow keys are
used to scroll to each display. The indication displays are referenced as 1 (0
CNT/0 CPS), 2 (PEAK), 3 (VALLEY), and 4 (COUNT), which are the factory
default settings. The indication displays can be programmed to show other
parameters and automatically scroll (See Program Displays Module). The last
indication display that was viewed at power down, is the one viewed on power
up.
The Presets and Counter Load values are accessed from any of the
indication displays or from the programming loop. The Count and Rate scale
factors are accessed from the Scale Factors display or when in the
programming loop from the Program Scaling module. In the Program Mode
display, the operator enters the programming loop to access all parameters to
configure the unit. Shown below is the Main Display Loop.
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