METHOD OF DEVICES INTERFACING OF DISTRIBUTED CONTROL VIA COMBINED TWO-WIRE COMMUNICATION AND POWER LINE Russian patent published in 2015 - IPC H04B3/54 

FIELD: electricity.

SUBSTANCE: lead device polls the sensors by current pulses in two-wire communication and power line, and sensors connected to the line generate response signals by change of the current pulses width. At the beginning of each polling pulse the maximum current is set at output of the lead device, and by link of the non-linear feedback current is regulated and amplitude of voltage pulses is stabilized in two-wire communication and power line at level of power supply voltage of the lead device. Under first cycle tact of the polling the lead device generates the current pulse with width at least two periods of clock frequency to set all sensors to the initial state, and then pulses with width about 75% of period of clock frequency are transmitted, their number corresponds to number of the polled sensors. The serial number of each pulse determines number of the polled sensor, upon its activation the current pulse width is reduced to 25% of period of clock frequency, and the sensor activation is confirmed by decreasing of the voltage pulse width entering via the two-wire communication and power line to input of the lead device.

EFFECT: reduced power consumption and increased authenticity of information communication in the distributed control systems with combined two-wire communication and power line of the sensors.

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