I used to do training and support for a company that manufactures security systems. We made the boards that the door contacts, PIRs, and the like connect to, but we didn't make peripheral hardware, other than card readers. I enjoyed hearing how the doohickey on the other end of the wire worked
I would think that some persons would be interested in knowing how prox readers and cards work. I encounter lots of misconceptions about prox cards, such "they send out a signal all on their ownsome."
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