Building technical management controller with a two-wire data and power transmission line
First Claim
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1. An integrated power and data transmission apparatus for controlling the operation of electrical equipment in a building comprising:
- a two-wire bus including a first line acting as a voltage supply line and a second line acting as a return line for power and asynchronous data transmission;
a power supply means for providing a low level DC voltage to said two-wire bus, said power supply means including a current limiter for limiting the current supplied by said power supply means to said two-wire bus when said supply line and said return line are short-circuited;
a plurality of independently addressable modules coupled to said two-wire bus and powered by said power supply means, said plurality of modules including at least one module which transmits a command signal and one module which performs a preprogrammed function in response to said command signal, wherein each of said plurality of modules includes;
a) data transmission and data reception means for performing data transmission and data reception with another module;
b) a programmable microcontroller for controlling the operation of the module including performance of said preprogrammed function and said data transmission and data reception;
c) interface means coupled to said two-wire bus including means for providing uninterrupted power to the module and short-circuiting means controlled by said programmable microcontroller for short-circuiting said supply line to said return line; and
d) data communication priority means for determining a priority of data communication for the module including mans for detecting when a difference occurs between a signal present on said two-wire bus with a data transmission signal output from the module and withdrawing from data transmission when said difference is detected;
wherein data is transmitted on said two-wire bus as a binary DC signal with a logic high represented by the presence of a supply voltage of the two-wire bus and a logic low represented by a zero voltage on the two-wire bus caused by the short-circuiting of said supply line with said return line.
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Abstract
A building power management controller comprises a plurality of modules connected by a two-wire network. Each module comprises a data transceiver device, controlled by a microprocessor to both transmit data to the other modules and to a central unit via the two-wire network, and to receive information via this two-wire network. The modules are supplied with power by the two-wire network. When two modules transmit simultaneously, one takes priority so as not to disturb the messages transmitted.
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Citations
9 Claims
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1. An integrated power and data transmission apparatus for controlling the operation of electrical equipment in a building comprising:
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a two-wire bus including a first line acting as a voltage supply line and a second line acting as a return line for power and asynchronous data transmission; a power supply means for providing a low level DC voltage to said two-wire bus, said power supply means including a current limiter for limiting the current supplied by said power supply means to said two-wire bus when said supply line and said return line are short-circuited; a plurality of independently addressable modules coupled to said two-wire bus and powered by said power supply means, said plurality of modules including at least one module which transmits a command signal and one module which performs a preprogrammed function in response to said command signal, wherein each of said plurality of modules includes; a) data transmission and data reception means for performing data transmission and data reception with another module; b) a programmable microcontroller for controlling the operation of the module including performance of said preprogrammed function and said data transmission and data reception; c) interface means coupled to said two-wire bus including means for providing uninterrupted power to the module and short-circuiting means controlled by said programmable microcontroller for short-circuiting said supply line to said return line; and d) data communication priority means for determining a priority of data communication for the module including mans for detecting when a difference occurs between a signal present on said two-wire bus with a data transmission signal output from the module and withdrawing from data transmission when said difference is detected; wherein data is transmitted on said two-wire bus as a binary DC signal with a logic high represented by the presence of a supply voltage of the two-wire bus and a logic low represented by a zero voltage on the two-wire bus caused by the short-circuiting of said supply line with said return line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification