Giao tiếp RS485 với tính năng Auto Direction

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Hình ảnh một số mạch có tính năng Auto Direction cho giao tiếp RS485:

https://cxt.vn/upload/images/Linhkien/rs485.jpg

XY-K485 Module Chuyển Đổi TTL To RS485, Nguồn vào: 2.8~30V, Khuyến nghị:  3.3 hoặc 5V

serial - When it comes to UART to RS485 communication, what is the  difference between the 'MAX485' and the 'HW-0519' module? - Arduino Stack  Exchange

Mô đun chuyển đổi dòng điện tự động RS485 sang 485 | Shopee Việt Nam

Một vài Schematic được mình sưu tầm trên Google:

RS 485 with LPC-23xx

Diagram, schematic

Description automatically generated

https://protosupplies.com/product/scm-ttl-to-rs-485-interface-module/

https://1.bp.blogspot.com/-4E977I8ziwQ/YVvthE00T0I/AAAAAAAA5Xw/ElsPurRzlDgc9YosVWwvjywUaPaoanfsgCLcBGAsYHQ/s1241/relayboard3_autoflow.png

https://cool-emerald.blogspot.com/2021/10/16-channel-rs485-modbus-relay-board.html

Diagram, schematic

Description automatically generated

https://www.microchip.com/forums/m520447.aspx

schematic

https://electronics.stackexchange.com/questions/65881/any-good-way-to-automatically-enable-an-rs-485-transmitter-in-hardware

Diagram, schematic

Description automatically generated

Diagram, schematic

Description automatically generated

A picture containing text, map, sky

Description automatically generated

https://www.ti.com/lit/ug/tiduei7/tiduei7.pdf?ts=1656555466870&ref_url=https%253A%252F%252Fwww.google.com%252F

Diagram, schematic

Description automatically generated

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/

Diagram, schematic

Description automatically generated

A picture containing text, scoreboard

Description automatically generated

Diagram, schematic

Description automatically generated

Diagram, schematic

Description automatically generated

https://electronics.stackexchange.com/questions/244425/how-is-this-rs485-module-working

schematic

https://electronics.stackexchange.com/questions/481797/how-to-wire-up-gsm-modem-dce-with-max485

Diagram, schematic

Description automatically generated

https://epcb.vn/blogs/news/thiet-ke-gateway-esp32-lite-ethernet-rs485-2-input-2-output

IC của MAXIM:
Half-Duplex RS-485-/RS-422- Compatible Transceiver with AutoDirection Control MAX13487E/MAX13488E

Mạch bảo vệ chống sét, ESD:

https://www.bizkit.ru/wp-content/uploads/2021/04/RS485_protection_schematic.jpg

Mạch RS485 đảm bảo EMC:

https://programmersought.com/images/156/0bd3379aa0344f53917ce14fc2c20ec4.png

https://programmersought.com/article/88443791778/

Tham khảo các tài liệu khác:
TI: https://www.ti.com/lit/ug/tidubw6/tidubw6.pdf?ts=1659497591714

ANALOG DEVICES: https://www.analog.com/media/en/technical-documentation/application-notes/an-1458.pdf

MAXIM: https://datasheets.maximintegrated.com/en/ds/MAX13487E-MAX13488E.pdf

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