Hình ảnh một số mạch có tính năng Auto Direction cho giao tiếp RS485:
Một vài Schematic được mình sưu tầm trên Google:
https://protosupplies.com/product/scm-ttl-to-rs-485-interface-module/
https://cool-emerald.blogspot.com/2021/10/16-channel-rs485-modbus-relay-board.html
https://www.microchip.com/forums/m520447.aspx
https://electronics.stackexchange.com/questions/65881/any-good-way-to-automatically-enable-an-rs-485-transmitter-in-hardware
https://www.ti.com/lit/ug/tiduei7/tiduei7.pdf?ts=1656555466870&ref_url=https%253A%252F%252Fwww.google.com%252F
https://programmersought.com/article/26414119160/
https://ee-paper.com/design-of-signal-isolation-self-transceiver-based-on-74hc14-chip-and-adm2483-chip-to-realize-rs-485-interface/
https://electronics.stackexchange.com/questions/244425/how-is-this-rs485-module-working
https://electronics.stackexchange.com/questions/481797/how-to-wire-up-gsm-modem-dce-with-max485
https://epcb.vn/blogs/news/thiet-ke-gateway-esp32-lite-ethernet-rs485-2-input-2-output
IC của MAXIM:...
