This module is mainly used for measuring DC voltage, current, active power, frequency and energy consumption, the module is without display function, the data is read through the RS485 interface.Features:It is mainly used for measuring DC voltage, current, active power, frequency and energy consumption.Comes with built in shunt, the current measure range is 0.01-10A.Physical layer use UART to RS485 communication interface, baud rate is 9600, 8 data bits, 2 stop bit, no parity.The application layer use the ModbusRTU protocol to communicate, it only supports function codes such as 0x03, 0x04,0x06, 0x41, 0x42, etc.Voltage threshold can be set, divide into high voltage and low voltage threshold, when the measured voltage exceeds the threshold, it can alarm.Specification:Brand: PEACEFAIRModel: PZEM-003Voltage:Measuring Range: 0.05-300V (When the test voltage is 7V, please use the independent power supply mode)Resolution: 0.01VMeasurement Accuracy: 1%Current:Measuring Range: 0.01-10AResolution: 0.01AMeasurement Accuracy: 1%Power:Measuring Range: 0.1-3kWResolution: 0.1WMeasurement Accuracy: 1%Energy Consumption:Measuring Range: 0-9999kWhResolution: 1WhMeasurement Accuracy: 1%Reset Energy: Use Software to ResetOver Voltage Alarm:Default High Voltage Threshold: 300VDefault Low Voltage Threshold: 7VCommunication Interface: RS485 InterfaceWorking Temperature: -20~60Product Size: Approx. 9*6*2.3cm/3.5*2.4*0.9inchWeight: Approx. 72g~92g / 2.5oz~3.2ozDescriptionResolutionVoltage value1LSB correspond to 0.01VCurrent value1LSB correspond to 0.01APower value low 16 bits1LSB correspond to 0.1WPower value high 16 bitsEnergy value low 16 bits1LSB correspond to 1WhEnergy value high 16 bitsHigh voltage alarm status0xFFFF is alarm,0x0000 is not alarmLow voltage alarm status0xFFFF is alarm,0x0000 is not alarmRegister addressDescriptionResolution0x0000High voltage alarmthreshold(5~350V),default is 300V1LSB correspond to 0.01V0x0001Low voltage alarmthreshold1~350V,default is 7V1LSB correspond to 0.01V0x0002ModbusRTU addressThe range is 0x0001~0x00F7OptionalKit#11 x DC Consumption Meter#21 x DC Consumption Meter1 x RS485 to USB CableNote:RS485 interface is passive output, need external connect 5V power supply and the external power supply should 100mA.When the input test voltage is less than 7V, it must supply 5V independent work voltage through USB port.Do NOT use the USB port bring by your PC to be the independent power supply, otherwise it may damage your PC.