1. The serial port and COM port refer to the physical interface form (hardware), while TTL, RS-232, and RS-485 refer to the level standards (electrical signals). 2. When connecting devices, generally only GND, RX, and TX are connected. The Vcc or +3.3V power line is not connected to avoid conflicts with the power supply of … Read more
Answer: Since the RS-232-C interface standard was introduced earlier, it inevitably has shortcomings, mainly as follows: (1) The signal voltage levels of the interface are relatively high, which can easily damage the chips of the interface circuit. Additionally, due to incompatibility with TTL levels, a level conversion circuit is required to connect to TTL circuits. … Read more
Follow + Star our official account to not miss exciting content Author | A Person and a Team Official WeChat Account | A Person and a Team According to technical specifications and electrical interfaces, there are three common serial data standards: RS-232, RS-422, and RS-485. This article will introduce cable termination techniques, the use of … Read more
For more timely and valuable content, please follow our WeChat official account: wc_sfdj We sincerely invite industry professionals and organizations to submit articles to us, and there are rewards for submissions Submission email: [email protected] Source | Wangcai Servo and Motion Control Overview of RS-232 The RS-232 interface complies with the serial data communication interface standard … Read more
Click the blue text above to follow usReceive 20 automation benefits, limited to 200 people, valid for 2 weeks. Claim now Claim | Zhejiang University DCS Configuration Tutorial Video Claim | Holley DCS Configuration Tutorial Video Claim | Siemens PLC Configuration Tutorial Video Claim | 10 DCS Books + 10 Instrument Maintenance Books Claim | … Read more
1Introduction to Serial Ports RS-232, RS-422, and RS-485 are all standards for serial data communication interfaces, initially formulated and published by the Electronic Industries Association (EIA). RS-232 was released in 1962, named EIA-232-E, as an industrial standard to ensure compatibility between products from different manufacturers. RS-422 was developed from RS-232 to address its shortcomings. To … Read more
Serial communication is one of the most basic communication methods faced by electrical engineers, with RS-232 being the simplest among them.Many beginners often struggle to understand the relationship and differences between UART and RS-232, RS-422, and RS-485. This article will discuss these concepts to help clarify their relationships. If we compare serial communication to traffic, … Read more
PLC Serial Communication: Modbus Protocol Analysis and Implementation In actual industrial automation projects, communication between PLCs and other devices (such as sensors, inverters, HMIs, etc.) is an indispensable part. Among the many communication protocols, Modbus protocol has become a “frequent guest” in the field of industrial control due to its simplicity, ease of use, and … Read more
A netizen consulted me about methods to handle communication interference. Below are our exchanged emails (text slightly modified), hoping to help everyone. Q&A Netizen:Our unit has a set of equipment equipped with an S7-400 system, and a TP 270 touch screen placed on the operation console. Information is transmitted via DP/MPI. The strange issue is … Read more
Hello everyone, I am Da Yi! Today we will talk about a very practical topic: UART-485 communication. This technology allows microcontrollers and PLCs to communicate wirelessly, just like two people conveniently chatting via video call on their phones. Have you ever wondered how mobile phones achieve wireless communication? Let’s start with an example from our … Read more