Title: Digital multiplexing system remote scanning of a plurality of monitoring points

Abstract: A digital start-stop multiplexing system including a sender which sequentially scans a plurality of monitoring points and generates a train of digital pulses coded to represent information provided at the monitoring points for transmission over a transmission line to a receiver which is responsive to the digital pulses to automatically synchronize itself with the sender, store the data pulses and provide indications of conditions indicated at the monitoring points. The receiver also monitors the transmission line and detects and displays open or short circuit conditions of the transmission line. Coded pulses may also be transmitted from the receiver location to the remote sender over the same transmission line during stop portions of the primary signal.

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Other info:

Inventors: Pederson, Carl N. (Westmont, IL, US)
Angelopoulos, Peter G. (Elmhurst, IL, US)

Application Number: 419714
Filing Date: 1973-11-28
Publication_date: 1976-02-10
Assignee: Johnson Service Company (Milwaukee, WI)
Primary Class(es): 370/305 340/660, 340/870.09, 375/369
Other Classes:
US Patent Ref:

3651263	Mar, 1972	Lindback	178/69.
3686439	Aug, 1972	Gerard	340/413.
3735396	May, 1973	Getchell	340/413.
3764983	Oct, 1973	Stok	340/413.
3812430	May, 1974	Schmidt	178/69.

Other Refs:
Primary Examiner: Habecker, Thomas B.
Assistant Examiner:
Attorney: Johnson, Dienner, Emrich & Wagner