When the supply voltage is switched on, the information is transmitted to a non-volatile memory in the module from a plugged in HOPKEY. Then this HOPKEY can be used to "train" other receivers. In the last receiver, the HOPKEY can be preserved. If no HOPKEY is plugged in, the information in the module is used.
RAD-ISM-900-HOP-US
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Hopkey
2867539
The HOPKEY contains information such as the transmission frequencies used and the hop sequence. This information is required e.g. when installing an additional receiver / repeater in an existing system.