Major Changes Initial version Added marking and STM 425J. Editorial corrections. Changed PCB / System Drawings – STM 425J and STM 429J. Added radio certifi- cate. 1.31 Changed helical antenna picture Update of revision with consolidation and small corrections.
In addition a sign of life signal is transmitted every 20-30 minutes. A LRN button and a TX indicator LED are pre-installed on the PCB. On STM 429J they are oriented upwards. When the LRN button is pressed then a special teach-in signal will be sent.
Therefore mode change is limited to 50 times. In normal application scenario only very few are required. The factory delivery mode of the STM 429J is standard – not encrypted. This mode is com- mon mode originally available. Secure mode was added in later product upgrades.
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