RS485 is Not a Language, But a ‘Highway’ Let’s use a vivid analogy to understand: RS485: It is like building atwo-way, two-lane highway. It specifies how wide this road is (transmission distance, up to 1200 meters), how many vehicles can run simultaneously (load capacity, up to 128 devices), and the basic rules for vehicle operation … Read more
Hello, good evening everyone~ Today we have another technical article about Siemens communication! Siemens Modbus RTU Communication: S7-200 Smart Modbus RTU Master Station Communication (√) S7-200 Smart Modbus RTU Slave Station Communication (√) RS485/232 Communication Ports and DP Connector Connection Methods (√) S7-1200 Modbus (RTU) Instruction V3 Basic Functions S7-1200 Modbus (RTU) Instruction V4 New … Read more
WeChat SearchTechnical Training RS485 is one of the most common buses, and almost every industrial control device uses it, which we are quite familiar with. We all know that RS485 is a half-duplex communication, and its internal source in the CPU is serial communication. Serial communication distinguishes between transmission TX and reception RX. If TX … Read more
WeChat SearchTechnical Training In industrial control, PLC is a device that runs stably, has powerful performance, and is easy to program, which is favored by many enterprises. Generally, communication between the PLC and control devices is mostly through serial communication interfaces, controlled by their corresponding communication protocols, among which the most common are RS485 and … Read more
A few days ago, I saw discussions in the group chat about the issue of “TTL, RS232, and RS485 transmission distances“..Today, I took some time to share related 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 what … Read more
Introduction:RS-232 and RS-485 are both industrial serial data interface standards, initially formulated and published by the Electronic Industries Alliance (EIA), with RS-232 released in 1962, named EIA-232-E, as an industrial standard to ensure compatibility between products from different manufacturers. To expand its application range, EIA also established the RS-485 standard in 1983, adding multipoint, bidirectional … Read more
1. Basics of RS232 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, representing the latest modification of RS232 (1969). Prior to this, there were RS232B and RS232A. … Read more
The DB25 serial port generally only uses three pins: 2 (RXD), 3 (TXD), and 7 (GND). With the continuous improvement of devices, the DB25 connector is rarely seen today, and it has been replaced by the DB9 interface. The pins used in DB9 differ from those in DB25, specifically 2 (RXD), 3 (TXD), and 5 … Read more
This expert technical article is brought to you by Feng Xuewei from the Siemens Industrial Expert Team, titled “Differences Between RS232, RS485, and RS422 Serial Communication Standards”. About Feng: Areas of Expertise: Siemens Integrated Automation Systems and Technologies, including S7-PLC Automation Systems, Network Communications, Profinet Networks, Factory Network Systems, Industrial Remote Communications, Industrial Information Security, … Read more
(Click the above brown words to download the materials) Consider a DC power supply with three pins at its output socket: positive, negative, and ground. Accordingly, the load’s plug should also have three pins corresponding to the power supply side to correctly obtain the energy supply. Note that there are three essential conditions to be … Read more