Method of establishing communication

Details Method of establishing communication Method of establishing communication

1983-08-22

1985-06-04

George, Keith E.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340909, 340924, H04M 900

Patent

active

045216444

ABSTRACT:
A method of establishing communication between a first device (e.g. 12) in a first one (e.g. 22) of a plurality of groups (22, 32, 42 and 48) with a second device (e.g. 28) which is a selected one of a plurality of devices (e.g. 24, 26, and 28) and a second one (e.g. 32) of the plurality of groups (22, 32, 42 and 48). The method is utilizable in a communications system having a plurality of groups (22, 32, 42 and 48) and a plurality of devices (e.g. 24, 26 and 28) within at least one (e.g. 32) of the plurality of groups (22, 32, 42 and 48), where communication between the plurality of groups (22, 32, 42 and 48) is by a randomly addressable switching system (20), where each of the plurality of groups (22, 32, 42 and 48) has a unique address within the randomly addressable switching system (20), where each of the plurality of devices (e.g. 24, 26 and 28) within each of the plurality of groups (22, 32, 42 and 48) has a unique identification code within the dedicated line (18, 30, 40 and 46). The method consists of connecting (202) the first device to the switching system, addressing (204) the second group, responding (206) by all devices within the second group, addressing (210) the second device within the second group, disconnecting (212) all but the address device within the second group, and responding (216) by the second device to establish communication. Communication (218) between the first device and the second device may then commence.

REFERENCES:
patent: 3675196 (1972-07-01), Molloy et al.
patent: 3828307 (1974-08-01), Hungerford
patent: 3868640 (1975-02-01), Binnie et al.
patent: 4076961 (1978-02-01), Holsinger et al.
patent: 4110743 (1978-08-01), Zahnd
patent: 4419666 (1983-12-01), Gurr et al.

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