RS-485 Framework Expansion Card (FTDI Edition)

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Its available from multiple sources, it has low pin count in easily hand-solderable package, and at 5 Mbps its way faster than UART I was planning to pair it with. There are so many ways to calculate these resistor values and you need to know a lot about the exact setup in order to make it perfect. For protection, I decided to use good old SM712 TVS diodes to keep SP485EN safe and a few fast fuses on both data lines and on the ground for catastrophe prevention. Routing boards intended for type-C connector used here requires 1.0 mm or smaller bit in order to properly do the notches. After a short back-and-forth where I got to explain the exact problem, I had my updated order with extra notes attached.

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