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AssigneeSiemens Gebaudesicherheit GmbH & Co. OHG
InventorsWerner Schropp, Karlheinz Schreyer
Estimating the term…
A method is proposed for radiotransmission in a danger alarm system that operates by way of repeaters and yet is of current-saving design, so that battery operation is possible. Here, the reception means (3, 6, 9) are switched on cyclically at preassigned points in time, and transmission-ready participants (1, 4, 7) send a preamble leading to the result that the intended recipient participants, in event of reception, remain switched on until the end of the complete preamble, and in the event that no preamble is received, are switched on again. In the preamble, a point in time is transmitted at which the receiver switches on again, to receive the data telegram proper.
A method of radiotransmission in a danger alarm system having a plurality of participants each having a transmitter and a receiver, comprising cyclically switching-on the receivers at preassigned points in time, sending a preamble by a transmission-ready participant, said receiver in the event of receiving a preamble, remaining switched-on until the preamble is completed, and in the event that no preamble is received, being switched-off, wherein the start time of a data telegram is transmitted in the preamble, a recipient's receiver, after receiving the start time, is switched-off, and switched-on again at that start time, and the transmission-ready participant sends out a telegram over his transmitter which is received by the receiver.
Dependencies are inferred from the claim text.