Addressing / Device ID
The device ID is the unique address assigned to each transmitter set in production, and it is carried in every packet. The receiver processes only packets carrying an ID registered in its own table and discards the others without even putting them through the checksum test. This is the basis on which many sets can work on the same site without triggering one another.
The address field sits at the start of the packet; the receiver reads this field and, if it sees a mismatch, exits without processing the remaining fields. This both lowers consumption and prevents false triggering from the outset.
- Address space: the wider the field, the lower the probability of a random collision.
- Learning: the ID is written into the receiver's memory during the learning procedure and is not lost when power is removed.
- Multiple registrations: some receivers can store more than one transmitter ID; the use of a backup remote control relies on this.
An important distinction: the address is not a security measure but a discrimination mechanism. Since the transmission is in the air, the ID can be listened to; the real protection against unauthorised use is encryption and session verification. On the AXI side, a unique pairing ID per device is one of the features of the XRF protocol listed in the dump data for the HCT400 and HCT402 sets.
Context in which this term is used: Receiver-transmitter pairing procedure