Solid state remote unit for data transmitting system

Claim 2

In combination with a signal transmission line and a condition monitoring switch, a data signalling system comprising a power circuit connected to the signal transmission line, switching means connected to the signal transmission line for loading thereof, oscillator means connected to the power circuit for imposing frequency signals on the signal transmission line, digital logic means energized through the power circuit by the signal transmission line for intermittently loading the power circuit and gating the oscillator means, power control means responsive to actuation of the condition monitoring switch for transferring power from the signal transmission line to the power circuit during operation of the digital logic means, said power circuit including parallel circuit sections respectively connected to the signal transmission line and the switching means for supplying energy respectively to the condition monitoring switch and the oscillator means, and a regulated power circuit section connected in series with one of the parallel circuit sections for supplying energy to the digital logic means.

Claim 3

The combination of claim 1 including means connected to the power circuit for detecting predetermined signal frequencies in the signal transmission line during operation of the digital logic means, and shut-down means responsive to detection of said predetermined frequencies by the detecting means for disabling the power control means to unload the signal transmission line and remove power from the power circuit.

Claim 4

The combination of claim 2 wherein said digital logic means includes a source of clock pulses, programming means connected to the power circuit for sequentially rendering the switching means, the oscillator means and the detecting means operative, counter means connecting the source of clock pulses to the programming means for timing the periods during which said switching means, oscillator means and detecting means are operative, code control means connected to the counter means for converting the clock pulses into control signals, and gating means connecting the code control means to the switching means and the oscillator means for said intermittent loading of the power circuit and gating of the oscillator means.

Claim 5

The combination of claim 3 wherein said counter means includes a pair of counters connected to the code control means for selecting different numbers of code pulses in a train of pulse groups from the clock pulses, delay means interconnected between said pair of counters for spacing said code pulses, and a third counter connected in series with said pair of counters for spacing programmed changes of the programming means.

Claim 6

In combination with a signal transmission line and a condition monitoring switch, a data signalling system comprising a power circuit connected to the signal transmission line, switching means connected to the signal transmission line for loading thereof, oscillator means connected to the power circuit for imposing frequency signals on the signal transmission line, digital logic means energized through the power circuit by the signal transmission line for intermittently loading the power circuit and gating the oscillator means, power control means responsive to actuation of the condition monitoring switch for transferring power from the signal transmission line to the power circuit during operation of the digital logic means, said digital logic means including a source of clock pulses, programming means connected to the power circuit for sequentially rendering the switching means and the oscillator means operative, counter means connecting the source of clock pulses to the programming means for timing the periods during which said switching means and oscillator means are operative, code control means connected to the counter means for converting the clock pulses into control signals, and gating means connecting the code control means to the switching means and the oscillator means for said intermittent loading of the power circuit and gating of the oscillator means.

Claim 7

In combination with a signal transmission line and a condition monitoring switch, a data signalling system comprising a power circuit connected to the signal transmission line, switching means connected to the signal transmission line for loading thereof, oscillator means connected to the power circuit for imposing frequency signals on the signal transmission line, digital logic means energized through the power circuit by the signal transmission line for intermittently loading the power circuit and gating the oscillator means, power control means responsive to actuation of the condition monitoring switch for transferring power from the signal transmission line to the power circuit during operation of the digital logic means, said digital logic means including a source of clock pulses, programming means connected to the power circuit for sequentially rendering the switching means and the oscillator means operative, counter means connecting the source of clock pulses to the programming means for timing the periods during which said switching means and oscillator means are operative, code control means connected to the counter means for converting the clock pulses into control signals, and gating means connecting the code control means to the switching means and the oscillator means for said intermittent loading of the power circuit and gating of the oscillator means.

Claim 8

The combination of claim 5 wherein said counter means includes a pair of counters connected to the code control means for selecting different numbers of code pulses in a train of pulse groups from the clock pulses, delay means interconnected between said pair of counters for spacing said code pulses, and a third counter connected in series with said pair of counters for spacing programmed changes of the programming means.

Claim 9

In combination with a signal transmission line and a condition monitoring switch, a data signalling system comprising analog interface means connected to the signal transmission line for monitoring and transmitting signals to the transmission line, digital logic means connected to the analog interface means for programming operation thereof, and power control means responsive to actuation of the condition monitoring switch for transferring power to the digital logic means from the transmission line to generate said signals and program operation of the analog interface means, said digital logic means including a source of clock pulses, programming means for controlling operations of the analog interface means, counter means connecting the source of clock pulses to the programming means for timing said operations and code control means connected to the counter means for generating said signals, said counter means including a pair of counters connected to the code control means for selecting different numbers of code pulses in a train of pulse groups from the clock pulses, delay means interconnected between said pair of counters for spacing said code pulses, and a third counter connected in series with said pair of counters for spacing programmed changes of the programming means.

Claim 10

In combination with a signal transmission line and a condition monitoring switch, a data signalling system comprising analog interface means connected to the signal transmission line for monitoring and transmitting signals to the transmission line, digital logic means connected to the analog interface means for programming operation thereof, and power control means responsive to actuation of the condition monitoring switch for transferring power to the digital logic means from the transmission line to generate said signals and program operation of the analog interface means, said digital logic means including a source of clock pulses, programming means for controlling operations of the analog interface means, counter means connecting the source of clock pulses to the programming means for timing said operations and code control means connected to the counter means for generating said signals, said counter means including a pair of counters connected to the code control means for selecting different numbers of code pulses in a train of pulse groups from the clock pulses, delay means interconnected between said pair of counters for spacing said code pulses, and a third counter connected in series with said pair of counters for spacing programmed changes of the programming means.

Claim 11

In combination with a signal transmission line and a condition monitoring switch, a data signalling system comprising a power circuit connected to the signal transmission line, analog interface Means connected to the signal transmission line for monitoring and transmitting signals to the transmission line, digital logic means connected to the analog interface means for programming operation thereof, and power control means responsive to actuation of the condition monitoring switch for transferring power to the power circuit from the transmission line.

Claim 12

In combination with a signal transmission line and a condition monitoring switch, a data signalling system comprising a power circuit connected to the signal transmission line, analog interface Means connected to the signal transmission line for monitoring and transmitting signals to the transmission line, digital logic means connected to the analog interface means for programming operation thereof, and power control means responsive to actuation of the condition monitoring switch for transferring power to the power circuit from the transmission line.

Claim 13

The combination of claim 8 wherein the power circuit includes parallel circuit sections respectively connected to the signal transmission line and the analog interface means for supplying energy to the condition monitoring switch, and a regulated power circuit section connected in series with one of the parallel circuit sections for supplying energy to the digital logic means.