modbus serial communication

Using C++builder to develop serial communication programs under Win9x is a common headache for programmers, not only to understand many complex API functions, but also to master multithreaded programming. Thankfully, some companies have developed tools for C++builder to write serial communications programs, such as the Moxa Company's Pcomm (which can be downloade

php5| Application Demo I. Prior knowledge: What is rs232/rs484 and its application? QUOTE:RS232 interface is a serial port, computer chassis rear of the 9-core (or 25-core) socket, next to the general has "| o| o| "Sample identification.The general chassis has two, the new chassis may have only one. Laptops may not be available.There are many industrial instruments that use it as a standard communication

Basic concepts of Serial Communication 1. What is a serial port?2, what is RS-232?3, What Is RS-422?4, What Is RS-485?5. What is a handshake?1. What is a serial port?The serial port is a protocol used to communicate with a very general device on a computer (do not confuse it

C # Serial Communication ProgrammingIvanxBy This article describes how to use C # To create a serial communication program on the. NET platform. NET 2.0 provides the serial communication function. Its namespace is System. IO. Port

The definition of serial port, please know for yourself.C # operation serial communication in. NET powerful class library, only three steps are required:1 Create2 Open3 Send/Receive1 Create:1 The required namespaces for serial communication are as follows:using System.IO.Por

Summary:Pyserial module:https://github.com/tbusf/pyserialPython uses pyserial for serial communication: http://blog.csdn.net/log1100/article/details/54380325Python module--pyserial:http://blog.csdn.net/dainiao01/article/details/5885122 for serial communicationParameters for the Serial classser = serial.Serial(port=None

Connection Methods for serial communication: 9-pin/25-pin Basic connection method for Serial Communication Currently, the commonly used serial ports include 9-pin serial ports (DB9) and 25-pin

Under Win32, you can use two kinds of programming to implement serial communication, one is to use ActiveX control, this method is simple, but less flexible. The second is to call the Windows API function, this method can clearly grasp the mechanism of serial communication, and free and flexible. The following is a des

/* ------ + ------An example of serial ProgrammingTo help you better understand serial programming, We will compile two routines (see the source code section ),Both routines implement serial communication between the industrial computer and the Baxter display instrument through the RS485 interface. WhereThe first routi

Three ways of Siemens PLC serial communication time: 2015-10-25-14:31:55 Edit: Electrician section: Siemens PLC Introduction: Siemens PLC serial communication Three ways, divided into RS485 serial communication,

Document directory (1) experiment Overview (2) test preparation (3) program flowchart (4) experiment source code and Analysis (5) Experiment Results I. Connecting In a wireless sensor network, cc2430 sends the collected data to the upper computer (PC) for processing, and the upper computer needs to send control information to cc2430. All of this is inseparable from the transfer of information between the two. In this section, we will learn how to implement

communication program. Test, with 1 PCs as the main station, another PC simulation of the work of 32 sub stations, two PCs using rs232c serial communication. To the main station communication demo program forms (form) to add 1 communication controls, 2 timer controls and a

The last article to tell you about the serial port programming some of the basic knowledge. Today, we are going to introduce a simple example of serial port programming. This example can help you to have a general understanding of the basic knowledge of serial communication. The first is to look at the interface: A b

Today I learned the serial communication experiment under wince. The following is a summary: 1. Device File Name: the device file name prefix consists of three uppercase letters used to identify the special device file name corresponding to the special flow interface driver. The file name prefix is stored in the key value of the corresponding driver in the registry. Such as COM (

There are many ways of communication between single-chip microcomputer and PC. The following program mainly uses the asynchronous serial communication of 51 single-chip microcomputer.I. 51 Serial Communication pins of Single-chip Microcomputer P3.1 is the txd pin (Transfer D

Serial Communication /Serial Communication1 introduction of serial port /Serial IntroductionSerial interface (Serial Interface) is referred to as the serial port, usually COM interface,

The physical connection is as follows. Each serial port is attached to multiple collectors. Communication Protocol: Baotou (1B) + address code (1B) + command word (1B) + Data Length (1B) + Verification Code 1 (1B) + Data body (NB) + Verification Code 2 (1B ). Here, verification code 1 verifies the address code, command word, data length, and Verification Code 2 verifies the data body. 1.

OutputStream out; static InputStream in; SerialBuffer SB; ReadSerial RT; /** * * Constructor * * @param PortID the ID of the serial to be used. 1 for COM1, * 2 for COM2, etc. * */ public SerialBean(int PortID) { PortName = "COM" + PortID; } /** * * Thi

Raspberry Pi uses python+pyserial to realize serial communicationExt.: http://blog.csdn.net/homeway999/article/details/8642353Directory (?) [+] Raspberry Pi uses pythonpyserial to realize serial communication Raspberry Pi End Mount Pyserial Method 1source Installation Method 2pip Installation Raspberry PI Terminal connection

This period of time to do a communication with the Hardware Device small project, involving scanning head, conveyor line, weighing machine, labeling machine and other hardware. And the communication between the devices using a serial port or network (Socket) way. The network communication used by the scanning head and