Method and apparatus for polling security alarm installations

Details Method and apparatus for polling security alarm installations Method and apparatus for polling security alarm installations

1975-09-15

1978-06-27

Cooper, William C.

179 5R, H04M 1104

Patent

active

040976963

ABSTRACT:
A centrally located polling system uses conventional telephone dial networks and a means for digital telecommunication to periodically interrogate remote site alarm installations for security related information. Apparatus at the central location retrieves remote site telephone numbers from memory and controls dialing sequences to establish communication exchange between the central and remote sites. Circuit means are provided to validate the communication link, or alternatively, retry the dialing sequence. Apparatus at the remote site continuously monitors the status of a plurality of alarms and is responsive to requests from the central location by means of the telephone dial network. The remote site security status thus transmitted is received and digitally displayed in coded form at the central location.

REFERENCES:
patent: 3400378 (1968-09-01), Smith
patent: 3553376 (1971-01-01), Bogaart
patent: 3842218 (1974-10-01), DeLuca
patent: 3885108 (1975-05-01), Zock
patent: 3899639 (1975-08-01), Cleveley
patent: 3920926 (1975-11-01), Lenaerts
patent: 3922492 (1975-11-01), Lumsden
patent: 3932709 (1976-01-01), Hoff
patent: 3937890 (1976-02-01), Blethen

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