DM2436AB not only takes the place of several static converters and measuring instruments(V,A,W,VAR,PF,WH,VARH,Hz)by single unit,but also have some special function such as Maximum measuring,Minimum measuring and comparator output. In communication, we use the most convenient and the easiest RS232 or RS485 as our standard ooutput port, besides, we adopt Modbus Protocol, one of the most popular protocol in the world, as our standard protocol.