10 Mbps half-duplex transceiver for RS-485 and RS-422 buses
35 mV receiver hysteresis — noise margin on a long cable run
The built-in 35 mV receiver hysteresis helps reject noise on the differential bus, which matters when the cable runs through a noisy industrial environment. It reduces the chance of the receiver toggling on coupled interference, so you get a cleaner signal at the UART without external filtering.