Operating Manual Smart Weather Sensor
38 G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany
10.4.2 Power Saving Mode 2
Power saving mode 2 permits another relevant reduction of the power consumption, but
adds on the other hand more severe restrictions.
In this operation mode the device will be almost completely switched off and will wake up
only by the data request for one measurement cycle. During measurement and data
transmission the device will be switched on for about 10 – 15 sec. The total consumption will
be mostly determined by the data request interval.
Note: This operating mode has the following restrictions:
All restrictions of power saving mode 1
Power saving mode 2 is not available for devices with radar rain sensor (WS700-UMB,
WS600-UMB, WS400-UMB). We recommend devices with tipping bucket rain gauge for
low power applications.
The calculation of average, minimum and maximum as well as precipitation intensity are
not available. Only instantaneous values will be transmitted.
Compass measurement is only performed once after power up. The fan, which is
otherwise deactivated, will be switched on shortly for the time of this measurement.
Communication protocol Modbus is not available
When using the UMB protocol a certain request sequence and timing is required (s. Chap.
19.3.7). The interval length must be at least 15sec to make sure that the measurement
and transmission cycle can be completed. Shorter interval could cause the device to stay
in transmission state without starting a new measurement.
The joint operation with other sensors in an UMB network is possible, but it has to be
considered that each telegram (even when addressed to another device) will cause the
Smart Weather Sensor to wake up for at least several seconds, thus increasing the total
power consumption. The minimum interval length must be hold up under consideration of
the telegrams with other addresses. Mixed operation of devices in power saving mode 2
with devices in normal operation and fast request rates within the same UMB network is
not possible.
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