SmartSwarm 300 Series
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88
In the diagram above the green triangles represent the “10 per second” rate of change against which each new
sample is compared when it is received. At the top and bottom of a sine-wave the rate of change is low, so the
trigger condition is not met.
Even though the Rate limit is specified in units per second, the system does not have to wait 1 second before
deciding whether or not to publish. Whenever two consecutive samples are received, be they separated in time by
less than or more than 1 second, the instantaneous rate of change is calculated. If the actual rate of change is
greater than the programmed threshold, the MQTT publish will be triggered.
In the following example, the Modbus Master is polling the same register at a much slower rate: once every 4
seconds:
