15 minutes to announce the current values. Power is provided to STM 350 and STM 350U by means of a small pre-installed solar cell which works in conjunction with an integrated energy storage element in order to ensure operation in periods without ambient light.
Simplified device block diagram Measurement and transmission timing STM 350 and STM 350U wake up approximately once every 100 seconds to measure tem- perature and humidity. The measured values are then compared against the last reported (transmitted) values. If there is a significant change then the measured values are transmit- ted immediately.
Test reports are only valid for the delivered modules with their standard (unmodified) hard- ware and software. STM 350 and STM 350U HW and SW design must not be modified and they must not be used outside their specification limits.
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