Communication system
First Claim
1. A communication system, comprising:
- a communication cable including a pair of first and second wires;
a local device having positive and negative terminals;
a slave controller connected to the communication cable and connected to the positive and negative terminals of the local device, the slave controller being fed with a first direct current voltage via the communication cable and feeding a second direct current voltage to the local device; and
a master controller connected to the communication cable, the master controller having a feeding phase for feeding the first direct current voltage to the communication cable and a communication phase for communicating with the slave controller by changing the first direct current voltage in such a manner that voltages on the first and second wires of the communication cable are opposite in phase, whereinwhen the master controller communicates with the slave controller, the slave controller changes the second direct current voltage in such a manner that voltages on the positive and negative terminals of the local device are opposite in phase and vary synchronously with the first direct current voltage.
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Accused Products
Abstract
A communication system includes master and slave controllers, a local device connected to the slave controller, and a communication cable having a pair of wires and connected between the master and slave controllers. The master controller feeds a first DC voltage to the slave controller via the communication cable and communicates with the slave controller by changing the first DC voltage such that voltages on the wires of the communication cable are opposite in phase. The slave controller generates a second DC voltage from the first DC voltage and feeds the second DC voltage to the local device. When the master and slave controllers communicate with each other, the slave controller changes the second DC voltage such that voltages on terminals of the local device are opposite in phase and vary synchronously with the voltages on the communication cable.
20 Citations
7 Claims
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1. A communication system, comprising:
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a communication cable including a pair of first and second wires; a local device having positive and negative terminals; a slave controller connected to the communication cable and connected to the positive and negative terminals of the local device, the slave controller being fed with a first direct current voltage via the communication cable and feeding a second direct current voltage to the local device; and a master controller connected to the communication cable, the master controller having a feeding phase for feeding the first direct current voltage to the communication cable and a communication phase for communicating with the slave controller by changing the first direct current voltage in such a manner that voltages on the first and second wires of the communication cable are opposite in phase, wherein when the master controller communicates with the slave controller, the slave controller changes the second direct current voltage in such a manner that voltages on the positive and negative terminals of the local device are opposite in phase and vary synchronously with the first direct current voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification