Low energy data communication circuit for hazardous or nonhazardous environments
First Claim
Patent Images
1. A data communication system, comprising:
- a first transmission circuit in a first location for transmitting a signal;
a first receiver circuit in a second location for receiving the transmitted signal, the first receiver circuit comprised of;
a. an averaging circuit receiving said transmitted signal through a switch for producing an average signal representing an average level of the transmitted signal received by the first receiver circuit; and
b. a comparator for comparing the average level of the average signal with the transmitted signal received by the first receiver circuit, wherein the comparator is turned on when the transmitted signal received by the first receiver circuit is above the average level and turned off when the transmitted signal received by the first receiver circuit is below the average level, wherein the switch is responsive to a feed back control signal from an output of the comparator that controls the switching of the transmitted signal received by the first receiver circuit through the switch to the averaging circuit;
wherein the output of the comparator represents the signal transmitted from the first transmission circuit.
2 Assignments
0 Petitions
Accused Products
Abstract
The present invention relates to a data communication circuit and system for use in hazardous or nonhazardous environments. In the preferred embodiment, the system is a bi-directional, low energy, current loop data communication circuit primarily for high speed data communications via parallel or twisted pair conductors. The system of the present invention can safely transmit data across long distances (e.g., up to 1000 feet (300 meters)) in an explosive atmosphere.
-
Citations
19 Claims
-
1. A data communication system, comprising:
-
a first transmission circuit in a first location for transmitting a signal; a first receiver circuit in a second location for receiving the transmitted signal, the first receiver circuit comprised of; a. an averaging circuit receiving said transmitted signal through a switch for producing an average signal representing an average level of the transmitted signal received by the first receiver circuit; and b. a comparator for comparing the average level of the average signal with the transmitted signal received by the first receiver circuit, wherein the comparator is turned on when the transmitted signal received by the first receiver circuit is above the average level and turned off when the transmitted signal received by the first receiver circuit is below the average level, wherein the switch is responsive to a feed back control signal from an output of the comparator that controls the switching of the transmitted signal received by the first receiver circuit through the switch to the averaging circuit; wherein the output of the comparator represents the signal transmitted from the first transmission circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A data communication receiver, comprising:
-
a first receiver circuit adapted to receive a transmitted signal sent from a first transmission circuit located remotely from the first receiver circuit, the first receiver circuit comprised of; a. an averaging circuit receiving said transmitted signal through a switch for producing an average signal representing an average level of the transmitted signal received by the first receiver circuit; and b. a comparator for comparing the average level of the average signal with the transmitted signal received by the first receiver circuit, wherein the comparator is turned on when the transmitted signal received by the first receiver circuit is above the average level and turned off when the transmitted signal received by the first receiver circuit is below the average level, wherein the switch is responsive to a feed back control signal from an output of the comparator that controls the switching of the transmitted signal received by the first receiver circuit through the switch to the averaging circuit; wherein the output of the comparator represents the signal transmitted from the first transmission circuit. - View Dependent Claims (13, 14, 15, 16)
-
-
17. A data communication transmitter, comprising:
-
a first transmission circuit in a first location for transmitting a signal to a first receiver circuit in a second location for receiving the transmitted signal, the first receiver circuit comprised of; a. an averaging circuit receiving said transmitted signal through a switch for producing an average signal representing an average level of the transmitted signal received by the first receiver circuit; and b. a comparator for comparing the average level of the average signal with the transmitted signal received by the first receiver circuit, wherein the comparator is turned on when the transmitted signal received by the first receiver circuit is above the average level and turned off when the transmitted signal received by the first receiver circuit is below the average level, wherein the switch is responsive to a feed back control signal from an output of the comparator that controls the switching of the transmitted signal received by the first receiver circuit through the switch to the averaging circuit; wherein the output of the comparator represents the signal transmitted from the first transmission circuit. - View Dependent Claims (18, 19)
-
Specification