Installation and Startup
Rev. 1 June 2019
33
41113042
Analog Input
You can use the green wire to connect Pin 4 to an analog sensor. As an analog input
(voltage sensing pin), the router monitors voltage changes in small increments. This
allows you to monitor equipment that reports status as an analog voltage.
Pin 4 detects inputs of 0.5–36 V referenced to ground. When used with a sensor to
transform values into voltages, the pin can monitor measurements such as temperatures,
sensors, or input voltage.
Figure 2-14: Analog Input
Data sampling is handled by a dedicated microprocessor. In order to filter noisy signals,
twenty measurements are taken over a 250 ms interval and they are averaged to generate
a sample. If the change since the last sample is significant, a notification is sent to the
CPU for updating the current value displayed in the user interface and for use by Events
Reporting.
Changes are considered significant if the change is 150 mV or more. If there has not been
a significant change to the parameter being monitored, the CPU reads a sample every 2.5
minutes, which detects small changes.
Figure 2-15: Analog Input Sampling and Reading
Note: The same method is used to sample the input voltage and the internal board temperature for
Events Reporting. The significant changes are 300 mV for the input voltage and 1 ºC for the board
temperature.
RV55
V
in
Internal pull-up
resistor
Off (default)*
Z
in
!Nſ
Protection
Circuitry
Pin 4 (power connector)
Solar panel or battery
Output Off (default)*
+
–
Table 2-8: Analog Input
Pull-up
Minimum
Typical
Maximum
Units
Comments
Off
Analog Input Range
0.5
—
36
V
—
Analog Input Accuracy
-1.5%
0.50%
1.5%
—
—
Microprocessor
CPU
Sample every 250 ms,
Reading from the CPU
Updates UI
Events Reporting
When a reading is received,
based on 20 measurements
when change is significant
or 2.5 minutes has passed
with no change
Pin 4
Analog input
