Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1985-09-30
1987-03-31
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular coupling link
340506, 340518, 340525, G08B 100
Patent
active
046546383
ABSTRACT:
A monitoring system of the type suitable for use in monitoring signals from security installations or networks includes a central control station serving a plurality of users and to which the users are connected by an existing telephone network or some other form of direct or switched line connection. Each user is provided with an encoder in the form of a combined control unit and digital telephone dialler, said encoder being programmed with information concerning each user in principally alphabetical character form to increase the likelihood that the message will be received and understood even in the event that certain characters contained in the message are missing. The control station is equipped with means for receiving and decoding the message transmitted from the user's control unit together with visual display means, such as a VDU or line printer, for visually displaying the received message. The system embodying the invention removes the need for card file systems or expensive computers and improves the reliability of the system by the use of principally alphabetical characters.
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patent: 3944724 (1976-03-01), Kilby et al.
patent: 3958240 (1976-05-01), Richardson
patent: 4006460 (1977-02-01), Hewitt et al.
patent: 4040013 (1977-08-01), Carlson
patent: 4086434 (1978-04-01), Bocchi
patent: 4168494 (1979-09-01), Hummel et al.
Cadin Electronics Pty. Ltd.
Crosland Donnie L.
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