Communication network
First Claim
1. A communication network for transmitting data comprising:
- a master controller;
a slave control;
means for transformer coupling said master controller to said data path;
means for transformer coupling said slave control to said data path;
means for applying a DC voltage between taps provided in the master controller transformer coupling means when the master controller is energized;
means for detecting said DC voltage between corresponding taps provided in the slave control transformer coupling means and producing a responsive control signal; and
means for energizing the slave control in response to said control signal.
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Accused Products
Abstract
A communication network is provided for transmitting data in a hostile electromagnetic environment. Master and slave units are coupled to a data path by transformer coupling. The slave units can be turned on by applying a DC voltage between transfomer taps at the master, and detecting the voltage at corresponding taps at the slave. Separate pairs of conductors are used to carry signals transmitted by the master and signals transmitted by the slave. The conductors form a closed loop data path enabling the master to selectively transmit data either in a clockwise or counterclockwise direction around the loop. Data may also be received by the master either clockwise or counterclockwise around the loop. In this manner, the master can communicate with the slaves even if there is a break in the data path.
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Citations
20 Claims
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1. A communication network for transmitting data comprising:
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a master controller; a slave control; means for transformer coupling said master controller to said data path; means for transformer coupling said slave control to said data path; means for applying a DC voltage between taps provided in the master controller transformer coupling means when the master controller is energized; means for detecting said DC voltage between corresponding taps provided in the slave control transformer coupling means and producing a responsive control signal; and means for energizing the slave control in response to said control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A communication network for transmitting data comprising:
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a master controller having first and second transmitter ports and first and second receiver ports; a slave control; a first closed loop data path coupled between the first and second transmitter ports of said master controller and to said slave control for carrying signals from the master controller to the slave control; and a second closed loop data path coupled between the first and second receiver ports of said master controller and to said slave control for carrying signals from the slave control to the master controller; said master controller comprising means for transmitting data from said first or second transmission port to selectively effect data transmission in either a clockwise or counterclockwise direction around the first loop, and for receiving data at said first or second receiver port to selectively effect data reception in either a clockwise or counterclockwise direction around the second loop. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification