This article talks about serial duplex communication between PC and MCU. BAY888.com The world's leading slot game platform, providing exciting gaming experience and generic rewards. Join now and start your journey to victory!
List of contents for this article:
- 1、What are the MCU communication interfaces?
- 2、How should I choose serial communication?
- 3、Which device can implement full-duplex communication?
- 4、How does the upper computer communicate with the lower computer
- 5、Master these 16 commonly used circuit modules, and you no longer need to take time and effort to make hardware products!
- 6、[Single-chip microcomputer] Serial communication
What are the MCU communication interfaces?
1. There are mainly the following communication interfaces of a microcontroller: UART Universal Asynchronous Receiver/Transmitter, which is an asynchronous, full-duplex serial bus. It only requires two wires to communicate, with TXD used to send data and RXD used to receive data.
2. There are many common interfaces for single-chip computers, mainly including the following types: Parallel interface Universal parallel I/O port: This is the most basic parallel interface for single-chip computers, such as the P0 - P3 ports of 8051 series single-chip computers.
3. Introduction: SPI is a commonly used synchronous serial communication interface. Application: It is especially suitable for communication with Flash chips and other devices. It supports master-slave mode and has a relatively short transmission distance. UART/USART: Introduction: UART/USART is a basic serial communication interface. Function: Used to cooperate with the microcontroller and the level conversion chip, and supports multiple communication methods, such as RS232, and AT command interaction of Bluetooth and WiFi modules.
4. The interfaces of the MCU mainly include the following types: Serial interface: It is one of the most commonly used communication methods between the MCU and external equipment. Through bit-by-bit transmission of data signals, data exchange between the MCU and other equipment is realized. It is mainly used for long-distance communication and low-speed data transmission. Parallel interface: It can transmit multiple data bits at the same time, and the data transmission rate is fast. Commonly used to connect high-speed external devices such as printers. Need to occupy more MCU pins.
How should I choose serial communication?
The choice of a serial communication interface needs to be determined according to the requirements of specific application scenarios. RS-232 is suitable for short-distance, low-rate, and simple full-duplex communication scenarios, but it is recommended to choose other interfaces for scenarios that require transmission distance and anti-interference (such as RS-48USB or Ethernet). The following is a specific analysis: Applicable scenarios for RS-232 Short-distance communication: The maximum transmission distance of RS-232 standard is 50 feet (about 15 meters), which usually does not exceed 15 meters in actual use.
Serial communication is more suitable; if high-bandwidth, long-distance or multi-node networks are needed and standardized protocols are supported, Ethernet communication is the better choice.
Serial communication methods are classified according to communication synchronization method and data transmission direction. The differences and characteristics are as follows: Classified according to communication synchronization method Core characteristics of asynchronous communication: The transmission time interval between characters is not fixed, but the time interval between bits within characters is strictly fixed. The hardware structure is simple, allowing slight differences in clock frequencies between the sender and receiver, and synchronization is achieved through start bits and stop bits.
Picture display: (Figure 1: Full-duplex communication schematic diagram shows the transmission and reception diversion of data, which are transmitted by two different transmission lines respectively)(Figure 2: Half-duplex communication schematic diagram shows the use of the same transmission line for both reception and transmission, but both parties cannot send and receive data at the same time) To sum up, the three methods of serial communication each have their own characteristics and application scenarios, and which method is selected depends on the specific application requirements and communication conditions.
No complex reverse operations are required. Conclusion Serial communication occupies a place in the modern communication world with its unique transmission method. Understanding and mastering the differences between simplex, half-duplex and full-duplex, as well as the characteristics of asynchronous and synchronous, can help us better design and optimize communication systems and achieve efficient and convenient data transmission. When selecting a communication mode, the most suitable choice should be made based on the needs and performance requirements of actual application scenarios.
Which device can implement full-duplex communication?
1. Communication method: Transceiving and receiving are independent and can be synchronized, and full-duplex communication can be realized between master and slave devices.
2. Definition of SPI (Serial Peripheral Interface): SPI is a synchronous, full-duplex bidirectional 4-wire serial interface bus.
3. This method has simple wiring and low cost, and is suitable for most industrial control, security monitoring and other scenarios that do not require simultaneous two-way communication. To achieve full-duplex communication in full-duplex mode, two pairs of twisted pairs are required, one pair is dedicated to transmitting data (TX+, TX-) and the other pair is dedicated to receiving data (RX+, RX-). In this way, the device can simultaneously send and receive data.
How does the upper computer communicate with the lower computer
The communication between the upper computer (such as PC) and the lower computer (such as AT89C51 microcontroller) is mainly realized through serial communication. The core is to use the UART (Universal Asynchronous Transceiver) of the microcontroller to exchange data with the RS-232 interface of the PC, and solve the problem of level incompatibility through a level conversion chip (such as MAX232).
USB connection: The upper computer is usually equipped with a USB interface, and some microcontrollers in the lower computer also support the USB interface. After both parties run the corresponding communication program, they can communicate efficiently through the USB interface. Serial port connection: Almost all single-chip computers have UART interfaces, which can be used to communicate with the upper computer.
There are two main connection methods between the upper computer and the lower computer: USB and serial port. An upper computer usually refers to a computer, while a lower computer refers to an electronic device containing a single chip microcomputer (MCU). Most modern computers are equipped with USB interfaces, and some microcontrollers also support USB interfaces, allowing efficient communication with computers. Of course, this kind of communication requires both parties to run corresponding communication programs. In addition to USB, serial port is also a common connection method.
In practical applications, the appropriate transmission rate can be selected based on specific needs and equipment performance. A higher transmission rate can improve data transmission efficiency, but it may require higher signal quality, and the transmission rate needs to be determined by comprehensively considering the stability and reliability of the system. There are 4 lines connecting the RS422 interface for signal connection, namely A, B, A-, and B-. Where A and B are data transmission lines, and A-and B-are signal ground wires.
Unified protocol selection for communication protocols: The upper computer and the lower computer should adopt the same communication protocol, such as Modbus, CANopen, etc., in order to accurately understand the data formats sent and received by each other. For example, the Modbus protocol stipulates the data transmission method, address allocation, etc., and the two parties communicate in accordance with this standard.
Master these 16 commonly used circuit modules, and you no longer need to take time and effort to make hardware products!
1. Function of RS232 communication circuit: Dual 232 communication, 3 wires connected to the female head, and working voltage of 5V. Core device: MAX202 or MAX232 chip. Features: Suitable for short-distance low-speed serial communication, such as data interaction between PC and MCU. Circuit diagram: Transistor serial communication circuit function: Low-cost serial communication, stable performance when the baud rate is low. Core device: Transistor (such as 8050).
2. Characteristics of PLC The high reliability of PLC is one of the reasons why it is most used in the industrial field. Simply put, the composition of the PLC is composed of a single chip microcomputer plus corresponding protection circuits and self-diagnosis functions. Therefore, the stability and safety of the PLC are higher than that of a single chip microcomputer. PLC has complete input and output functional modules.
3.(1) What should I do if the computer host is not used? The data inside has been transferred out. Is it safe to throw it into the moat? I am afraid that the data will be stolen if it is thrown on the street. In this case, the hard drive can be removed and retained, and the rest can be sold as waste. It can also be recycled. You don't have to worry about data being withheld by others.
4. Applicable scenarios and limitations: Models 86, 118 or 120 can hide modules.
[Single-chip microcomputer] Serial communication
1. Serial communication is an important way for single-chip computers to realize data transmission. Full duplex communication is realized through the UART interface and multiple working modes and baud rate configurations are supported. Overview of the basic functions of serial communication: Serial communication allows a single chip microcomputer to receive and send character data, and problems such as data loading, transmission format, rate control and correctness guarantee need to be solved.
2. The similarities and differences between the three buses, SPI, I2C, and UART, in MCU communication are as follows: The similarities all belong to serial communication: all three buses adopt serial communication methods, that is, data is transmitted bit by bit in sequence, compared with parallel communication. Compared with communication, the number of lines is reduced, hardware costs and complexity are reduced.
3. If you have any questions or additional opinions about this process, you are welcome to discuss it. Through communication, we can better understand and master the specific implementation details of serial communication. It should be noted that the description here is based on a typical serial communication protocol, and there may be differences in practical applications. Therefore, it is recommended to refer to relevant technical documents or standards in actual operation. I hope the above information can help you better understand the timing diagram of MCU serial communication.
4. The difference between serial communication and parallel communication of a single chip microcomputer is called serial communication. The characteristics of serial communication are: data bit transmission is carried out in bit order, and it can be completed with at least one transmission line. The cost is low but the transmission speed is slow. Serial communication distances can range from a few meters to several kilometers. Depending on the direction of information transmission, serial communication can be further divided into three types: simplex, half-duplex and full-duplex.
5. But this is also what can happen without interference. But if you use commercial power to supply power through a transformer or a switching power supply, when their voltage starting points are different, the voltage difference between the two microcontrollers may be large. This will immediately burn the microcontroller. In addition, only these two wires can only do unilateral serial communication: MCU 1 sends a signal to MCU 2, and MCU 2 receives the signal to carry out subsequent work according to instructions.
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