RS232: Asynchronous transmission standard interface. Typically, the RS-232 interface appears in the form of 9 pins (DB-9) or 25 pins (DB-25). Using a DB-9 9-pin connector, transmission employs shielded twisted pair cables, utilizing only three wires for sending data, receiving data, and signal ground. RS485: A standard that defines the electrical characteristics of drivers and … Read more
A few days ago, I saw a discussion in the group chat regarding the “transmission distances of TTL, RS232, and RS485“. Today, I took some time to share relevant content, hoping it will be helpful to everyone. Overview Many people may not be very familiar with TTL, RS232, and RS485, so let me briefly summarize … Read more
RS232 and RS485 are common interfaces in low-voltage applications, but some people always struggle to distinguish their differences. Below is an analysis of the RS232 and RS485 interfaces.Due to the early emergence of the RS232 interface standard, it inevitably has some shortcomings, mainly including the following four points:(1) The signal voltage levels of the interface … Read more
Wireless modules are one of the most important components in modern wireless communication and are quite popular in the market. There are various types of wireless modules, each showcasing different functionalities. However, have you noticed that most high-end walkie-talkie wireless modules come with a metal casing? Do you know what role this metal casing plays … Read more
[Abstract] The 485 bus is often used in the wiring of common access control systems, but most people do not understand it. Below, the editor will discuss the 485 bus protocol and the related knowledge of the 485 bus transmission distance. 485 Bus Protocol 485 Bus Protocol When the communication distance is required to be… … Read more