Communication system and communication terminal
First Claim
1. A communication system comprising:
- a plurality of communication terminals connected to a two-wire communication line;
a power supply that applies a voltage between two wires of the communication line; and
a current/voltage converter that converts a current change on the communication line to a voltage change on the communication line by voltage drop by two resistance components,each of the plurality of communication terminals comprising;
a transmitting circuit that is connected to the communication line and generates a primary current signal on the communication line, by changing a current flowing from the communication line; and
a receiving circuit that receives a secondary signal, which is generated by converting the primary current signal to a voltage signal by the current/voltage converter,wherein the current/voltage converter comprises the two resistance components, each being positioned along one of the two wires, and connected in parallel.
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0 Petitions
Accused Products
Abstract
A transmitting circuit is connected to a communication line and configured to transmit a primary signal, being a current signal, to the communication line by changing a current flowing from a transmission unit via the communication line. A receiving circuit is configured to receive a secondary signal which is generated by converting the primary signal transmitted from the transmitting circuit to a voltage signal by a current/voltage converter provided between the transmission unit and the communication line. Specifically, the primary signal, being a current signal transmitted from a communication terminal, is converted to the secondary signal being a voltage signal by the current/voltage converter. As a result, communication can be performed even when the impedance of the communication line is reduced, facilitating introduction of a communication system.
23 Citations
12 Claims
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1. A communication system comprising:
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a plurality of communication terminals connected to a two-wire communication line; a power supply that applies a voltage between two wires of the communication line; and a current/voltage converter that converts a current change on the communication line to a voltage change on the communication line by voltage drop by two resistance components, each of the plurality of communication terminals comprising; a transmitting circuit that is connected to the communication line and generates a primary current signal on the communication line, by changing a current flowing from the communication line; and a receiving circuit that receives a secondary signal, which is generated by converting the primary current signal to a voltage signal by the current/voltage converter, wherein the current/voltage converter comprises the two resistance components, each being positioned along one of the two wires, and connected in parallel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification