RS-485 falls under the half-duplex standard, which provides communication in both directions, but only one direction at a time.
In the software flow control, we can use RTS signal to select direction.
In modern design, super I/O can control flow direction automatically.
This video demonstrates how to turn on the auto flow control function of the RS-485 in the BIOS.
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EC70A/EC70B-SU Compact Fanless Industrial Computer
EC70A-SU/EC70B-SU embedded computers, support excellent computing, -20°C to +60°C temperature, DDR4 onboard, dual Mini PCIe, and industrial I/O interfaces for Industry 4.0 applications.