Communications: electrical – Digital comparator systems
Patent
1977-05-16
1979-06-26
Yusko, Donald J.
Communications: electrical
Digital comparator systems
1791752C, 3401461BE, H04Q 900, G08C 2500
Patent
active
041594703
ABSTRACT:
A loop communication system includes a loop controller originating and terminating parallel output multiple bit message frames over a pair of trunks to remote stations, each of which includes a multiplexing connection means to the incoming trunk segments, with means to selectively and operably connect one of the incoming trunk segments to a frame processor. A pair of transmitters are also provided at the interface means and actuated to synchronously and correspondingly retransmit the process signal over the two outgoing trunk lines or segments. A logic circuit directly transmits the signal from one receiver and blocks the other until the first fails. The message is processed and retransmitted by a pair of transmitters over the two outgoing trunk segments. Suitable indicators coupled into the logic circuit signal the failure. A contact status circuit initiates transmission of the failure location via message frames to the controller. A control switch by-passes the station and is operable manually or in response to a power failure.
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Froehling Paul
Galaszewski Robert D.
Strojny Lawrence J.
Johnson Controls Inc.
Yusko Donald J.
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