Garnet 709-RVC NLP Manual page 5

If a sender is operating properly and connected to the display with
good wiring, then the display will show the level normally. If the
wiring is disconnected, shorted, or cut, or if the sender panel is
defective, then the display will indicate an error code. The various
error codes are shown in the troubleshooting chapter.
With these diagnostic features and the digital nature of the tank
level sensing technology, it is almost impossible for the system
to indicate an incorrect water level, and in the very unlikely
event it does occur, servicing is greatly aided with the diagnostic
information.
The system also shows the RV battery voltage by measuring the
voltage which powers the display. The voltage is shown with a
resolution of 0.1 volt.
In order to keep the tank level and alarm information on the RV-C
bus current, the display regularly scans the senders every 10-15
seconds. When a tank button is pressed, the information displayed
is recalled from the most recent scan. A tank on hold is scanned
more frequently. Systems with two displays are configured so
that the primary display initiates the scanning and the secondary
display passively listens to the sender information, this way both
displays stay updated without interfering with each other.
The single common alarm output can be programmed to indicate
a high or low sewage level or a high or low water level. More than
one alarm can be assigned to the alarm output. This output can
be connected to an indicator light and used to show a high sewer
level and/or a low water level, alerting the user that attention is
required. Another example is the alarm could be used on the
black tank to prevent toilet use when the tank is full.
709-RVC NLP Manual
Page 5