RS-485 thoughts

MAX3485ESA+T * 10mbps * 32 devices MAX3485EESA+T * 12mbps * 32 devices MAX3485AEASA+T * 20mbps * 32 devices MAX3491ESD+T * 10mbps * 32 devices

https://www.maximintegrated.com/en/products/interface/transceivers/MAX3485E.html https://www.maximintegrated.com/en/products/interface/transceivers/MAX3485.html

"The MAX3488AE/90AE/91AE have a 1/4-unit load receiver input impedance, allowing up to 128 transceivers on the bus."