So Sánh 2 Chuẩn Truyền Thông RS232 Và RS485

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https://www.youtube.com/watch?v=0F6K7EM4B0Y&ab_channel=PHOENIXCONTACT So sánh 2 chuẩn truyền thông RS232 và RS485

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admin Uncategorized Tháng Năm 6, 2020

 Hôm nay, chúng ta tiếp tục bàn luận, xem xét sự khác nhau giữa hai chuẩn truyền thông RS232/RS485 các bạn nhé!

Như các bạn biết, RS232 có định nghĩa chuẩn giao diện cơ học ( giắc cắm), ở các máy tính PC đều có cổng truyền thông theo chuẩn RS-232 mà ta hay gọi là cổng COM. Còn RS485, thì ta hay thấy nó được truyền trên 2 dây, và khoảng cách xa hơn nhiều so với RS232. Vậy, sự khác nhau cơ bản giữa hai chuẩn này là gì?

Hình dưới sẽ cho chúng ta cái nhìn cơ bản sự khác nhau về mặt vật lý như: độ dài đường truyền, chế độ truyền thông, mức logic vật lý, dải tốc độ truyền thông,….

Ngoài ra, hai chuẩn này có một sư khác nhau cơ bản là ở phương thức truyền dẫn tín hiệu, hay hiểu nôm na là cách thức hoạt động:

• RS-232 cho phép sử dụng tối thiểu 3 dây: Tx ( truyền), RX ( nhận) và GND ( đất). Trong đó, trạng thái logic của tín hiệu sử dụng mức chênh áp giữa TX và RX so với dây đất GND.
• RS-485 sử dụng chênh lệch điện áp giữa 2 dây A và B để phân biệt logic 0 và 1, chứ không so với đất. Đặc biệt, khi truyền tín hiệu xa, nếu có sụt áp thì đồng thời sụt trên cả 2 dây nên tín hiệu vẫn đảm bảo.

Chính vì vậy mà RS485 cho phép truyền tín hiệu xa hơn và tốc độ truyền cho phép cũng cao hơn RS232.

Thêm nữa, RS485 cho phép liên kết đa điểm (multi point), gồm nhiều thiết bị có thể truyền thông trong 1 mạng còn RS232 thì chỉ truyền theo phương thức điểm – điểm (poin to point), tức là khi hai thiết bị đang trực tiếp kết nối truyền thông với nhau thì không thể có thiết bị thứ 3 cùng tham gia vào trao đổi dữ liệu được.

Điều hướng bài viết

Chào mừng ngày giải phóng miền Nam và Quốc tế lao động 30/4 – 1/5THÔNG BÁO THAY ĐỔI ĐỊA CHỈ XUẤT HÓA ĐƠN

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