Author: iot-en (page 111)

1. 50 pieces of electrical control knowledge 1. According to the classification of uses, low-voltage electrical appliances are divided into control electrical appliances, main command electrical appliances, protective electrical appliances, distribution electrical appliances and executive electrical appliances. 2. According to…

Capacitor is the most commonly used device in circuit design and is one of the passive components. Simply put, an active device is a device that requires an energy (electricity) source. It is called an active device. A device that…

What is breaker failure protection? When the main protection action of the faulty electrical equipment issues a trip command but the circuit breaker refuses to operate, the protection action information of the faulty equipment and the current or other information…

Siemens Profibus DP communication is often used for communication between PLC and other PLCs, remote substations, frequency converters, bus instruments and third-party DP equipment. The program is simple and the wiring is convenient. However, once the red light on the…

RS-422 RS-422 (EIARS-422-AStandard) is the serial port connection standard for Apple’s Mac in osh computers. RS-422 is developed from RS-232 and is proposed to make up for the shortcomings of RS-232. RS 422 is a one-way, balanced transmission method for…

The Electronic Industries Association (EIA) formulated and released the RS 485 standard in 1983, and it was revised by the Telecommunications Industry Association (TIA) and named TIA/EIA-485-A. Since the proposed standards proposed by EIA are all prefixed with “RS”, in…

1.Contact control signal line: DSR: Data set ready, the data device is ready, indicating that the MODEM is ready for use. DTR: Data Terminal ready, the data terminal is ready, indicating that the data terminal can be used. RTS: Request…

Released in 1962 by the Electronic Industries Association (EIA) and BELL and other companies; the full name of the RS 232C standard (protocol) is the EIA-RS-232C standard, where EIA represents the Electronic Industries Association, RS represents the recommended standard ,…

Synchronous serial communication: During synchronous communication, direct control of the sender’s clock to the receiver’s clock must be established so that both parties can achieve complete synchronization; Characteristics of asynchronous communication: It does not require strict consistency of the clocks…

ASCII: American Standard Code for Information Interchange American Standard Code for Information Interchange: A computer coding system based on the letter J; Mainly used to display modern English and other Western European languages; The most common single-byte encoding system today;…

Explanation of serial communication and parallel communication Serial communication: data bits are sent one data bit after another, and the data bits represent 0 or 1 Parallel communication: sending 8 data bits at a time, which is one byte, Comparison…

Serial networking server products provide solutions for accessing industrial equipment directly through the network. Traditional serial devices can thus be converted into Ethernet devices that can be monitored and controlled from a LAN or even the Internet. XUNWEI’s serial port…