User Manual

June 10, 2021 Ecoh 915 Manual 1.0.3 Pag. 17 of 25
4.10.3. Understanding Info and Keep-alive frames
In the regular working mode, "Sampling" and "Keep-alive" parameters are used. So the sensor
normally sleeps for a specific time then wakes-up for sampling (measurement) and applies the
algorithm detection in order to detect changes in the parking slot.
If a change is detected from ’free’ to ’occupied’ or viceversa, then an "Info" frame is sent. If no
change occurred during the last "Keep-alive" time, then a Keep-alive frame is sent. Besides, if a
sensor error is detected, a Keep-alive frame sending is forced in order to inform about this issue.
Example parameters used:
●
Samplig: 10 seconds
●
Keep-alive: 1 hour
Figure : Example Info and Keep-alive frames