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The output signal from sensor element of the transducer is feed through a low pass filter circuit for an operational amplifier and a controller. An 8-bit microprocessor Atmega 16 with a step DC voltage measurement 5 mV is used in the basis of the controller. Signal from the 10-bit ADC (MAX232) via an adapter is supplied on a USB-port. Active power in a transmission line is controlled by measuring wattmeter.
For communication between the device and the computer are used a communication protocol Modbus, based on the technology of "Client-Server". The Server is magnetoresistive active power converter with a fixed address, and the Client - the program. The device is functionally limited. There are used the read data.
Request format: 1-byte - device address; 2-byte - read function; 3,4-byte - register address; 5,6 - the number of read registers; 7,8-byte - checksum CRC.
Computer every 0,5 seconds makes a request for a data interface RS-232. A device that
