The RS485 bus has advantages such as simple structure, long communication distance, fast communication speed, and low cost. It is widely used in industrial communication, power monitoring, instrumentation, and other industries. Due to the harsh industrial control environment, more interference coupling can occur in communication lines, affecting the reliability of the RS485 bus, and even … Read more
In engineering, the RS485 control line is often mentioned. What exactly is it? Today, let’s discuss the applications related to RS485. By delving deeper into RS485, you will find that there is indeed a lot of knowledge involved. We will choose some common issues that need to be considered in weak current systems for everyone’s … Read more
RS-232, RS-485, and RS-422 often encounter various serial communication issues during on-site debugging, such as communication connection problems between different ports like RS-232, RS-485, and RS-422. Typically, conversion between RS-485 and RS-422 is quite convenient. However, when communicating between RS-232 and RS-422 ports, if there are no other conversion methods available on-site, and mailing could … Read more
1. RS-232-C is a serial physical interface standard established by the Electronic Industry Association (EIA) in the United States. RS is the abbreviation for “Recommended Standard,” 232 is the identification number, and C indicates the revision number. The RS-232-C bus standard has 25 signal lines, including one main channel and one auxiliary channel. In most … Read more
A few days ago, I saw discussions in my technical group about the topic of “TTL, RS232, and RS485 transmission distances“. Today, I took some time to share relevant content. Overview Many readers might not know what TTL, RS232, and RS485 are, so this section provides a brief overview of them. 1. TTL Level TTL: … Read more
Follow the IoT Planet to track the latest developments in the Internet of Things! “IoT Planet” focuses on sharing technologies and applications related to the Internet of Things. In the Internet of Things, communication lines are used to transmit data, signals, and power to establish communication links between devices. Common communication lines include USB cables, … Read more
1. Review: Overview of ROS Communication Mechanism & Similarities and Differences with MQTT Communication Overview of ROS Communication Mechanism The main communication mechanisms in ROS are as follows: 1. Topics ○ Publish/Subscribe Model: In this communication method, nodes can publish messages to a topic or subscribe to a topic to receive messages. This method is … Read more
Data packets sent by IoT smart devices must be encapsulated by the corresponding protocol at each layer. With the rapid development of Internet of Things (IoT) technology, most smart devices’ communication modules support various network communication protocols such as TCP, UDP, MQTT, CoAP, HTTP, and LwM2M, which include both transport layer and application layer protocols, … Read more
MQTT Packet Structure In the MQTT protocol, an MQTT packet consists of three parts: Fixed Header, Variable Header, and Payload. (1) Fixed Header. Present in all MQTT packets, indicating the packet type and group class identifier. (2) Variable Header. Present in some MQTT packets, the packet type determines whether the variable header exists and its … Read more
What is a Communication Network There is a network surrounding us at all times, such as telephone networks, telegraph networks, television networks, computer networks, etc.; even within our bodies, there are many network systems, such as the nervous system and the digestive system. The most typical example is the computer network, which is a combination … Read more