Multiple remote terminal digital control system
First Claim
1. An electrical control system for controlling a plurality of electrical loads comprising:
- central controller means;
a plurality of control means each associated with a respective one of said loads;
each of said control means including means for controlling its respective associated load and each of said control means having a plurality of control states;
said central controller means incuding means for selectively transmitting multibit digital serial messages, each of said serial messages consisting of a plurality of individually unique multibit address signals, each corresponding to one of said terminal means and each of said serial messages further including a command signal;
each of said control means including terminal means;
a common bus connecting said central controller means and each of said terminal means adapted to receive and transmit said serial messages from said central controller means to all of said terminal means;
each terminal means including means responsive to the receipt of at least two consecutive serial messages containing its corresponding unique address signal to cause said control means to assume one of said states, each state corresponding to a differing combination of command signals transmitted in said consecutively received serial messages;
whereby each of said control means is caused to assume one of said states upon receipt of said consecutive serial messages both containing said unique address signal and a combination of command signals in said consecutive messages corresponding to said state.
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Accused Products
Abstract
A central processor exercises on-off power control over a number of widely spaced loads and determines the status of the loads through a system which includes a transmitter-receiver terminal at each load and a common data bus connecting the central station to all of the transmitter-receivers. Each receiver has a unique address and the processor addresses one of the receivers by sending a message consisting of the receiver'"'"'s address plus a command signal over the bus. A valid message consists of two sequential transmissions of the unit'"'"'s address and the combination of command signals that accompany these addresses determines the function that is enabled at the receiver. All transmissions are serial and repeaters interposed in the bus restore signal levels and provide power to nearby terminals.
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Citations
6 Claims
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1. An electrical control system for controlling a plurality of electrical loads comprising:
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central controller means; a plurality of control means each associated with a respective one of said loads; each of said control means including means for controlling its respective associated load and each of said control means having a plurality of control states; said central controller means incuding means for selectively transmitting multibit digital serial messages, each of said serial messages consisting of a plurality of individually unique multibit address signals, each corresponding to one of said terminal means and each of said serial messages further including a command signal; each of said control means including terminal means; a common bus connecting said central controller means and each of said terminal means adapted to receive and transmit said serial messages from said central controller means to all of said terminal means; each terminal means including means responsive to the receipt of at least two consecutive serial messages containing its corresponding unique address signal to cause said control means to assume one of said states, each state corresponding to a differing combination of command signals transmitted in said consecutively received serial messages; whereby each of said control means is caused to assume one of said states upon receipt of said consecutive serial messages both containing said unique address signal and a combination of command signals in said consecutive messages corresponding to said state. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification