The PZEM-017 DC communication module, the module is mainly used for measuring DC voltage, current, active , frequency and energy consumption, the module is without display function, the data is read through the RS485 interface.PZEM-017: Measuring Range 50A,100A,200A,300A (the current range is depend on the external shunt specification ).Please click this link to download the software and the user manual.Link:http://.mediafire.com/file/vtvevyvattxi5sy/PZEM003%25EF%25BC%258C017-Master-English.zip/fileWorking voltage: 0.05 ~300VDC, when the test voltage is Less than 7V, please use the supply mode, Resolution:0.01V.Test voltage: 0.05 ~300VDC. Rated : 0.02A-300A/0.2-90kW. Measurement accuracy: 1.0 grade1 Current1.1 Measuring range:0.01-10A(PZEM-003);0.02-300A(PZEM-017;can be matched with 50,100,200,300A four kinds of shunt).1.2 Resolution:0.01A1.3 Measurement accuracy:1%2 2.1 Measuring range:0.2-90kW(PZEM-017)2.2 Resolution: 0.1W2.3 Measurement accuracy:1%3 Energy Consumption3.1 Measuring range: 0-9999kWh3.2 Resolution: 1Wh3.3 Measurement accuracy:1%Reset energy: use software to reset.Communication interfaceRS485 interface.Communication protocolPhysical layer protocolPhysical layer use UART to RS485 communication interface.Baud rate is 9600, 8 data bits, 2 stop bit, no parity.Other instructions:1 RS485 interface is passive output, need external connect 5V supply and the the external supply should Greater than 100mA.2 When the input test voltage is less than 7V, it must supply 5V work voltage through -USB port;3 Note: Do not use the USB port bring by your PC to be the supply, otherwise it may damage your PC Colour:blackMaterial:Plastic + MetalSize:90 x 60.5 x 23mmPackage Contents:1X PZEM-017module1X 50A shunt1X USB cableOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.