Hi Robert Others have addressed what the CRC16's are, but about reliability, be prepared to experiment with what you do with the spares. I wrote about experiements in a recent thread (subject "fiasco"), and in my case, connecting some of the spares to earth at one end was essential for reliability. Having moved from breadboard to a PCB with slave on, I added this to the network at the weekend and again had at least 50% data errors, and it was an "oh no, not again" feeling. However as soon as I connected the unused white/green at the master, it became 100% reliable again.
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