Have engineers encountered situations where testing a single RS-485 device shows no abnormalities, but communication data anomalies or connection failures occur when the device is networked? What are the reasons for these errors? This article will reveal the abnormality of RS-485 networking from the perspective of threshold levels. The RS-485 bus is widely used in … Read more
The RS-485 bus is widely used in various fields such as video surveillance, access control intercom, and building alarms due to its simple wiring and reliable stability. However, many problems arise during the wiring process of the RS-485 bus due to various inaccurate concepts. Here, we clarify some common misconceptions. 1 485 signal lines can … Read more
Currently, common serial interfaces include UART, 232, 422, 485, CAN, etc., but for beginners, it is generally difficult to understand their differences and when to use them. In industrial applications, not all serial interfaces are the same. For instance, the RS-485 serial interface meets the requirements of high speed and industrial robustness, making it a … Read more
RS-485 belongs to wired transmission, so it requires a hardware transmission medium, which can actually be just two wires. The signal transmitted over these two wires is the same; the sender splits this signal into two, but the receiver restores it to the original signal. The advantage of this method can be compared with RS-232; … Read more
RS-485 is a commonly used differential communication bus, capable of long-distance transmission with good interference resistance. However, how can we monitor the communication process for several hours or even days in the face of occasional faults during communication? 1. Testing Requirements Low-cost long-term monitoring of RS-485 bus communication. 2. Testing Challenges The RS-485 is … Read more
This article is a guide. The advantages of the RS-485 bus are well-known, and to ensure stable communication, isolated RS-485 modules are used for signal isolation. However, during actual RS-485 networking, one may encounter communication failures, errors, or even damaged RS-485 transceivers. What causes these issues? This article will deeply analyze the problems associated with … Read more
Click the blue text above Follow us! For over twenty years, RS-485 has been an extremely common wired communication interface in industrial applications. The balanced differential signal transmission characteristics of RS-485 can suppress common-mode noise and enable long-distance communication in noisy industrial environments. As a result, RS-485 has become a common communication port in most … Read more
In applications such as CAN and RS-485, it is generally recommended to use shielded twisted pair cables for networking and wiring to reduce external interference on bus communication. Many engineers understand this recommendation but do not know the underlying reasons. This article will briefly introduce the principle of interference resistance in twisted pair cables. 1Differential … Read more
The main differences between RS-232 and RS-485 are: 1. The transmission methods are different. RS-232 uses an unbalanced transmission method, known as single-ended communication. In contrast, RS-485 uses balanced transmission, which is a differential transmission method. 2. The transmission distances are different. RS-232 is suitable for communication between local devices, with a transmission distance generally … Read more
Compressor Technology Report Editor: Lu Sanbian Legal Advisor: Cui Daodao A gentleman has three transformations: he appears dignified from a distance, is warm upon approach, and speaks with authority. Understanding the RS-485 Communication Protocol Introduction In this article, we will delve into the world of the RS-485 communication protocol. If you are already familiar with … Read more