Item Type: Communication Module_x000D_ 1. Voltage:_x000D_ Measurement Range: AC 80-260V_x000D_ Resolution: 0.1 V_x000D_ Accuracy:0.5%_x000D_ _x000D_ 2. Current:_x000D_ Measurement Range:0-100A_x000D_ Resolution: 0.001 A_x000D_ Accuracy: 0.5%_x000D_ _x000D_ 3. Active Power_x000D_ Measurement Range:0-2.3 KW_x000D_ Min. Measuring Power: 0.4W_x000D_ Resolution: 0.1W_x000D_ _x000D_ 4. Power Factor_x000D_ Measurement Range: 0.00-1.00_x000D_ Resolution: 0.01_x000D_ Accuracy:1%_x000D_ _x000D_ 5. Frequency_x000D_ Range:45 Hz-65 Hz_x000D_ Resolution: 0.1 Hz_x000D_ Accuracy: 0.5%_x000D_ _x000D_ 6. Active Electrical Energy_x000D_ Metering Range:0-9999.99 kWh_x000D_ Resolution: 1Wh_x000D_ Accuracy: 0.5%_x000D_ _x000D_ Communication Protocol:_x000D_ 1. Physical layer protocol:_x000D_ Physical layer adopts UART to TTL communication interface_x000D_ Baud rate:9600,8 bit data bit,1 bit stop bit, no check_x000D_ 2. Application layer protocol_x000D_ The application layer supports for Modbus-RTU protocol for communication and currently only supports function codes such as 0x03 (read-hold register), 0x04 (read-input register), 0x06 (write single register), 0x41 (calibration), 0x42 (power zero)._x000D_ The 0x41 function code is limited to internal use (the address can only be 0xF8), used for factory calibration and back-to-factory maintenance, add a password of 16 bits after the function code, the password default is 0x3721._x000D_ The address range of the slave computer is 0x01 ~ 0xF7, and the address 0x00 is used as the broadcast address. The slave computer does not need to reply to the host, and the address 0xF8 is used as the general address. The address can only be used in a single-slave environment and can be used for calibration and other operations._x000D_ 3. Read the results of the measurement_x000D_ The command format for the host to read the result of the measurement is (8 bytes in total):_x000D_ Slave computer address + 0x04 + register address high byte + register address low byte + register number high byte + register number low byte + CRC check high byte + CRC check low byte._x000D_ Reply of slave computer to the following command format is divided into two types:_x000D_ Correct reply: Slave computer address + 0x04 + bytes + registers 1 data high byte + registers 1 data low byte +...+ CRC check high byte + CRC check low byte._x000D_ Wrong reply: Slave computer address + 0x84 + exception code + CRC check high byte + CRC check low byte._x000D_ The exception code is read as follows (the same below):_x000D_ 0x01, illegal function; 0x02, illegal address; 0x03, illegal data; 0x04, slave error._x000D_ The register layout of the measured results is shown in the following table:_x000D_ Register addressDescriptionResolution_x000D_ 0x000Voltage value measurement1LSB corresponds to 0.1V_x000D_ 0x001Current Measurement Value Low 16 Bits1LSB corresponds to 0.01A_x000D_ 0x0002Current Measurement Value High 16 Bits_x000D_ 0x0003Power Measurement Value Low 16 Bits1LSB corresponds to 0.1W_x000D_ 0x0004Power Measurement Value High 16 Bits_x000D_ 0x0005Energy Measurement Value Low 16 Bits1LSB corresponds to 1Wh_x000D_ 0x0006Energy Measurement Value High 16 Bits_x000D_ 0x0007Frequency Measurement Value1LSB corresponds to 0.1Hz_x000D_ 0x0008Power Factor Measurement Value1LSB corresponds to 0.01_x000D_ 0x0009Alarm State0xFFFF alarm0x0000 no alarm_x000D_ _x000D_ 4. Read and modify the slave parameters_x000D_ It supports reading and modifying the address and power alarm settings of the slave machine_x000D_ 5. Zero power_x000D_ 6. Calibration_x000D_ 7. CRC check