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If it has been 30 minutes or more since the device has received communication from the gateway (Join Request success, Downlink from user, ACK response), then the device requests an Acknowledgement of its next Uplink. An ACK request without an ACK response is reported by status bit “RCE”. After 3 consecutive unsuccessful ACK requests, the actuator automatically switches to “Rejoin”. In this situation, the actuator switches to Safety Mode and Safety Value as specified by the user, and attempts to rejoin a gateway. It sends a gateway Join Request at the frequency: 10 seconds, 10 seconds, 10 seconds, 2 minutes, then 1 hour until rejoinedJoin Requests every hour until it rejoins a gateway.
The actuator generates the required electrical energy for operation by means of a built-in thermoelectric generator (TEG) and therefore operates maintenance-free.