serial keys

A Preliminary Study on the combination of primary keys and primary keys of SQL statements; a preliminary study on the primary keys of SQL statements I. Composite primary key The so-called composite primary key means that the primary key of your table contains more than one field and does not use auto-increment IDs without business meanings as the primary key.For

Currently, the commonly used serial ports include 9-pin serial ports (DB9) and 25-pin serial ports (DB25). When the communication distance is close (1. Description of common signal ports of DB9 and DB259-pin serial port (DB9) 25-pin serial port (DB25)PIN number Function Desc

Multi-machine serial communication and machine serial communication★Devices Used Three 80c51 single-chip microcomputer are used, in which U1 controls the other two slave machines U2 and u3. Each single-chip microcomputer has a digital tube to display data. The host has two keys, KEY_1 and KEY_2, respectively, to control different slave servers.★Goals The main goa

In many cases, you may need to obtain the hardware information of the microcomputer. For example, you want to lock your software and prevent others from accessing it at will. The most effective way is to get the serial number of the CPU, and then let your software run on a machine with such a serial number. As we all know, the CPU serial number is unique! There

C # serial port control, c # Serial Port The serial port is the standard interface of a computer. Currently, a PC (Personal Computer) usually has at least two serial port COM1 and COM2. Serial interfaces are widely used in data communication, computer networks, and distribut

Serial Port is short for serial port, also known as serial communication interface or COM interface. Serial communication refers to the communication mode that uses the serial communication protocol (Serial Communication) to tra

Mycom is a serial communication class and has complete code in the previous article of this blog. (C # Serial Communication Programming (modified ))The following is the source code of the serial communication test program. The mycom class is stored in this project.You can implement simple serial communication, and hope

Commax serial port ing master Keywords: serial port to TCP serial port to udp tcp to serial port UDP to serial port Commax is a professional tool for RS232 ing RS232/422/485 serial port data and network data. It can work indep

Serial port operation of the class, including write and read operations, class can set the serial port parameters, set the reception function, open the serial port resources, close the serial port resources, the operation is completed, must close the serial port, receive

This article mainly provides a practical Java serial communication program for discussion and learning. /*************************************** **** Program file name: sendcomm. Java* Function: send data from the serial port COM1**************************************** **/Import java. AWT .*;Import java. AWT. event .*;Import java. Io .*;Import java. util .*;Import javax. Comm .*; Class s_frame extends fra

TTY Driver Architecture:1. TTY Concept Analysis1.1/dev/ttysca01.2/dev/tty1-n1.3/dev/consoleIn a Linux system, a terminal is a type of character device, which consists of many types, usually using a TTY for short-range end devices.. Serial Terminal (/dev/ttys*)The serial port terminal is the end device which uses the computer serial port connection. Linux consider

Scenario 1] [Ubuntu14.04 --> Win8] [Environment description] PC1: Win8, run serial port debugging tool: USR-TCP232-Test.exe; Serial Port COM1 parameters set to "9600,8, 1, N ". PC2: ubuntu14.04; set the serial port/dev/ttyusb0 parameter to "9600,8, 1, N ". [Code description] // Void * ctesteth: threadfunchandleserialporttransfer (in void * Arg) {If (null = Arg)

Serial collector for JAVA Garbage Collector and serial for garbage collection 1. Features The Serial collector is the most basic and oldest collector in the Java Virtual Machine. It was the only choice for collecting new generations of Java virtual machines before JDK 1.3.1. The Serial collector is a single-threaded co

Serial Communication and serial communication I. Preparations 1. Click here to download java serial communication tools 2. Put RXTXcomm. jar in the % JAVA_HOME % \ jre \ lib \ ext \ directory, and introduce the jar package to the project. 3. Put rxtxSerial. dll in the % JAVA_HOME % \ jre \ bin \ directory. Ii. Serial

This article takes the Visual C + + data collection and the serial communication to measure the application actual combat as the reference tutorialThis article is suitable for VC + + Serial Communication IntroductionFirst, page layout and add control1, install the vs2010.2, create a new MFC project based on VC + + CommNote: Click OK, then next, to change the application type to dialog base. Next to the last

Linux Serial Programming Tutorial (iii)--serial port programming detailed Preface: This chapter will formally explain the serial port programming technology, uses a serial port to send and receive the data the procedure, comes step-by-step explanation. Note: You can download my source code for reference. Open

I am working on a plug-in recently.ProgramTo obtain data from other programs from the serial port, but the problem is that the serial port is exclusively used, that is, only one program can read or send data to the serial port. So how can I obtain the same serial port data from other programs without shutting down oth

Virtual serial port-note, serial port-Note Virtual serial port is occupied, software available Serial Port Limited COM1-COM4, how to release and delete the occupied serial port A: You can delete A numeric entry in the Registry to clear these configurations: Enter regedit in

I read a lotArticleAnd writes are very simple (actually very simple :)). A detailed tutorial is provided. 1. Use vspd to connect two virtual serial ports on the PC. I connect com2 and com3. Click ADDR pair. 2. We can see that two virtual serial ports are connected together on virtual ports. 3. The virtual serial port is ready. First, you can dir

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