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, cur rent, 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 v oltage and low voltage threshold, when the measured voltage exceeds the threshold, it can alarm. Specification: Brand: PEACEFAIR Model: PZEM-003 Voltage: Measuring Rang e: 0.05-300V (When the test voltage is ＜7V, please use the independent power supply mode) Resolution: 0.01V Measurement Accur acy: 1% Current: Measuring Rang e: 0.01-10A Resolution: 0.01A Measurement Accu racy: 1% Power: Measuring Range: 0.1-3kW Resolution: 0.1W Measurement Accuracy: 1% Energy Consumption: Measuring Range: 0-9 999kWh Resolution: 1Wh Measurement Accuracy: 1 % Reset Energy: Use Software to Reset Over Voltage Alarm: Default High Voltage Thresh old: 300V Default Low Voltage Threshold : 7V Communication Interface: RS485 Interface Working Temperature: -20~60℃ Product Size: Approx. 9*6*2.3cm/3.5*2.4*0.9inch Weight: Approx. 72g~92g / 2.5oz~3.2oz Description Resolution Voltage value 1LSB correspond to 0.01V Current value 1LSB correspond to 0.01A Power value low 16 bits 1LSB correspond to 0.1W Power value high 16 bits Energy value low 16 bits 1LSB correspond to 1Wh Energy value high 16 bits High voltage alarm status 0xFFFF is alarm,0x0000 is not alarm Low voltage alarm status 0xFFFF is alarm,0x0000 is not alarm Register address Description Resolution 0x0000 High voltage alarm threshold(5~350V), default is 300V 1LSB correspond to 0.01V 0x0001 Low voltage alarm threshold（1~350V）, default is 7V 1LSB correspond to 0.01V 0x0002 ModbusRTU address The range is 0x0001~0x00F7 Optional Kit #1 1 x DC Consumption Meter #2 1 x DC Consumption Meter 1 x RS485 to USB Cable Note: RS485 interface is passive ou tput, 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 b y your PC to be the independent power supply, otherwise it may damage your PC.