Data transmission device, system and method

Details Data transmission device, system and method Data transmission device, system and method

1994-05-23

1995-01-17

Voeltz, Emanuel T.

Boots, shoes, and leggings

34087003, 34087006, 34087011, 34082554, G08C 1700, H04K 100, H04B 1500

Patent

active

053831349

ABSTRACT:
A data transmission device (11; 111,) for use in a system (10) comprising a plurality of such devices is described along with a corresponding method of data transmission. A data signal (at 23) is provided for transmission and a timer apparatus (16, 18; 16, 118, 160) establishes a sequence of maximum time intervals (6 hours; 6 hours and 20 seconds) during which the data signal can be transmitted. A transmitter (18, 24, 25; 118, 24, 25) transmits the data signal during each of these maximum time intervals. The timer apparatus (16, 18; 16, 118, 160) generates a random number (steps 33, 54; steps 172, 195) for each one of the maximum time intervals, and the transmitter (18, 24, 25; 118, 24, 25) determines the transmission times for the data signal in accordance with the random numbers provided for each of these maximum time intervals. Preferably, the data transmission devices are part of a data transmission system (10) which includes a data receiver (12), and the data signal is obtained from and corresponds to the output of a utility meter (13). By utilization of random numbers to randomize the transmit times of the transmission devices, the probability that data transmissions from one transmission device will interfere with data transmissions from another device is substantially minimized.

REFERENCES:
patent: 4414661 (1983-12-01), Karlstrom
patent: 4799059 (1989-01-01), Grindahl et al.
patent: 5056107 (1991-10-01), Johnson et al.
"SAE Truck and Bus Standard J1708, Jan. 1986", pp. 1-9.

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