RS-485 interface polarity detecting method and system based on electric energy meter communication protocol
A RS-485, polarity detection technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of easy reverse polarity, complicated polarity detection methods, etc., to achieve convenient construction and later maintenance, Realize the effect of simple and reliable, simple and reliable networking
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[0061] Such as image 3 As shown, the polarity detection method flow process provided by the present invention is:
[0062] 1. When communicating through the RS-485 interface, according to the requirements of the multi-function electric energy meter protocol (DL / 645-1997), the leading byte 0xfe and the frame header 0x68 must be transmitted first, and then the address bits, data bits, etc. should be transmitted.
[0063] 2. If the leading byte 0xfe is used to judge, the probability of misjudgment is relatively high, so the frame header 0x68 is used to judge, that is, the differential signal between A and B received by the RS-485 receiver is stored in an 8-bit shift register. Judge the data in the register at the falling edge of the clock. If the data in the register is 0x68, it means that the polarity detection is correct; if the data in the register is 0x79, it means that the polarity detection is wrong; if the data in the register is not 0x68 or 0x97, It means that the data ...
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