Communications: electrical – Digital comparator systems
Patent
1975-07-16
1976-11-23
Yusko, Donald J.
Communications: electrical
Digital comparator systems
307140, 317136, 340176, H04Q 906, H01H 4700
Patent
active
039939774
ABSTRACT:
An improved system and method for transmitting and monitoring, for example, commands to relays or other output command devices driving controlled devices remotely located from the transmission portion of the transmission and monitoring system. The system is usually divided into two parts geographically separated by a significant distance with two wires running between the parts (FIGS. 1 and 3). The first part is used for transmitting the command and interrogation signals through the use of current levels set by overall circuit characteristics and produced on alternate positive and negative half cycles by an alternating current source and set by the resistive load in the loop. The second part is for interpreting the signal by relay discrimination to determine if it is a command or just the interrogation signal requesting the current state of the device being controlled by the system and also for local indication. During operation, when no commands are being sent to the receiving part, the signals indicate the present state of remote contacts that represent the positional state of the controlled device. When a command is to be sent to the receiving part, the current is changed by resistive load change to a new level which represents the command to be transmitted to the receiving part. The improvement prevents the stop command from actuating the system in an improved manner rather than stopping the controlled device.
REFERENCES:
patent: 2992366 (1961-07-01), Veltfort, Jr.
patent: 3185911 (1965-05-01), Epstein et al.
patent: 3398329 (1968-08-01), Cataldo et al.
patent: 3629608 (1971-12-01), Trindle
Ostfeld David M.
Powell Electrical Manufacturing Company
Yusko Donald J.
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