Chapter 4 - Display Operation - Garnet SeeLeveL Special 809-DM User Manual

CHAPTER 4 - DISPLAY OPERATION

Display window description:
1. The upper left display shows the volume of product in the
selected tank. The lower right display shows the tank number
selected. When the 12 volt power is active, then the displays
are illuminated for night viewing.
2. Normally, the upper right and lower left displays are blank.
When dispensing, the upper right display shows the amount
that has been dispensed, and the lower left shows the volume
when the dispensing will be complete. During alarm events
these two displays will show the alarm information.
3. During dispense volume programming, the displays are used
for programming functions; see the alarm section for a full
description of that.
4. The lower right display also shows the alarm bypass status,
the leftmost decimal indicates a bypassed overfill warning
alarm. The third decimal (xxx.x) indicates a bypassed overfill
shutdown alarm. See the alarm section for full details.
Display scanning operation:
1. When not dispensing, the gauge continuously scans all of the
tanks for alarm events and to keep the remote communication
information up to date.
2. The viewed tank is the one that currently is showing its level
on the upper left display. The tank number of the viewed tank
is shown on the lower right display. To select the viewed tank,
see the next section below.
3. A scanned tank is any of the other five tanks that are not
being viewed. The gauge will select which of the six sender
bars to receive in order to do the scan.
4. The scanning order always gives priority to the viewed tank,
with the receiving of the scanned tanks occurring in between
the receiving of the viewed tank. For example, if tank 2 is the
viewed tank, the scanning will occur as follows: 2-1-2-3-2-4-
2-5-2-6-2-1-2-3-2-4-2-5-2-6-2 and so on.
5. Since each sender bar sends out its data about every 700ms,
it can take up to 10*700ms=7 seconds to complete a scan.
However, since the bars are transmitting randomly, a typical
scan will take less time than this. If the gauge starts to receive a
sender bar when it is already part way through its transmission,
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