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As the NEC protocol is widely used, all the addresses are used up quickly, so the extended NEC protocol is generated on the basis of the standard NEC protocol described above.
The extended NEC protocol discards the mechanism that the 8-bit address code of the standard NEC protocol is followed by the 8-bit address verification inverse code, and instead classifies the address verification inverse code as a part of the address code. In this way, the address code of the extended NEC protocol is changed from 8 bits to 16 bits, and the number of addresses allowed to be used is also increased from 256 standard NEC addresses to about 65000? Pieces. The extended NEC protocol is the same as the standard NEC protocol except for the difference in the number of bits of the address code