I have a question about how the first 8 bits on a standard 125 kHz EM Microelectronic tag, said to be the manufacturer data, are used in access-control systems. If a cloned tag doesn't have the first 8 bits like the original but it has the rest of the 32 bits, will it be a valid and working clone?
I reached out to EM Micro to get an answer to your question. The company says the behavior of a transponder is dependent on the system integration. One integrator might set up a system to ignore the first 8 bits, whereas another might include them. The only way to know if the 8 bits are being used as part of the identifier to allow access would be to ask the company that installed and configured your access-control system.
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