Method for synchronizing frequency-hopping short-range radio devices
First Claim
1. A method for synchronizing a security system control panel and a sensor, where the security system control panel and the sensor each have a transceiver, the method comprising the steps of:
- the security system control panel monitoring a publicly broadcast signal for a time signal generated and transmitted by a signal transmitting system;
receiving periodically the time signal directly from the signal transmitting system at the security system control panel;
calculating a frequency hopping index pointer by the security system control panel using the time signal;
accessing a frequency hopping table using the frequency hopping index pointer, the frequency hopping table is used by the security system control panel to determine when to hop between a plurality of different receiving channels and which of the plurality of different receiving channels to hop; and
the sensor receiving a time stamp directly from the signal transmitting system and selecting a channel of the plurality of different receiving channels that the security system control panel is then monitoring for signals from the sensor.
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Accused Products
Abstract
A method for synchronizing a security system control panel and a sensor. The control panel and the sensor each have a transceiver. The control panel monitors a publicly broadcast signal for an time signal, periodically receives the time signal, calculates a frequency hopping index pointer using the time signal and accesses a frequency hopping table using the frequency hopping index pointer. The frequency hopping table is used by the control panel to determine when to hop between multiple receiving channels and which of the receiving channels to hop. The sensor wakes up from a standby mode when the sensor determines that the sensor is to send data, receives the publicly broadcast signal that includes a time signal, selects the channel that the control panel is actively receiving data using the time signal and transmits the data to the control panel using the selected channel.
14 Citations
9 Claims
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1. A method for synchronizing a security system control panel and a sensor, where the security system control panel and the sensor each have a transceiver, the method comprising the steps of:
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the security system control panel monitoring a publicly broadcast signal for a time signal generated and transmitted by a signal transmitting system; receiving periodically the time signal directly from the signal transmitting system at the security system control panel; calculating a frequency hopping index pointer by the security system control panel using the time signal; accessing a frequency hopping table using the frequency hopping index pointer, the frequency hopping table is used by the security system control panel to determine when to hop between a plurality of different receiving channels and which of the plurality of different receiving channels to hop; and the sensor receiving a time stamp directly from the signal transmitting system and selecting a channel of the plurality of different receiving channels that the security system control panel is then monitoring for signals from the sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification