Table of Contents
Advertisement
When a reading is received,
Updates UI
Events Reporting
CPU
Rev 4 Nov.16
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.
Reading from the CPU
when change is significant
or 2.5 minutes has passed
with no change
Figure 2-14: 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 m V for the input
voltage and 1 degree Celsius for the board temperature.
Low Side Current Sink Output
Low side current sink output, for example to drive a relay, is only available using
Pin 4 on the power connector.
MP70 router
V
in
Internal Pull-up
Resistor
Off
I
= 500 mA (Typical)
Sink
* See
Table 2-8
on page 26 for more details.
Figure 2-15: Low Side Current Sink
25
Sample every 250 ms,
based on 20 measurements
Microprocessor
Vin
Protection
circuitry
External Solenoid/
*
Pin 4 on the power connector
Installation and Startup
Analog input
Pin 4 on the power connector or
Pin 6 or 7 on the auxiliary I/O connector
Relay circuit
4119008
Hide quick links:
Advertisement
Table of Contents
