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RS in Java for Windows December 28th, This tutorial is destined for all people who want to start to develop in minutes any software using RS serial communication port interface in Java language for Windows system. You find here all steps needed to setup environment in Eclipse for development and testing using serial communication port.
Moreover described technics allow you to develop software without physical equipment and test it as well. The alternative is RXTX - Java library using a native implementation providing serial and parallel communication for Java for several operating systems Windows included.
This library is available under GPL license. Preparing Eclipse environment Create new Java project The first thing you need to do is creating new Java project in Eclipse for example called JavaSerial.
Go to the home directory of your recently created JavaSerial Project and create new directory called lib. Refresh JavaSerial project by hitting F5 key.
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Click on Native library location: None and click Edit button. After all start clicking OK buttons until you back to the begining. Now you are ready to run and test you JavaSerial project in Eclipse.
Test your environment It's time to make simple test if the created Eclipse environment is properly configured to run applications based on RXTX library for Windows.
Create new class named ListAvailablePorts. If you do not see presented output please repeat configuration process again. Physical equipment The choise of physical equipment which you need to use during development of RS communication application depends on your needs and capabilities of your avialable equipment.
You should ask yourself following questions: Assuming that you have no access to the end-point device and you have only specification of RS communication protocol between device and application one of two following solutions should be considered.
Two serial ports wired together If your laptop or PC is equipped with two serial ports you can simply buy very cheap DB9-DB9 cable and connect two serial ports together. You will be able to connect end-point device software emulator to the one of serial ports available in the operating system and the application to the second of available serial ports.
Virtual Serial Port Driver 6. Serial ports within each pair could be connected together through the virutal RS wire. Then you can connect to the first emulated serial port an end-point device emulator and to the second serial port the application making a communication between these parts.
It is great solution if you don't have access to the device to which you develop RS communication software and if you don't have any serial port on your laptop or PC - the only thing you should have is a specification of RS communication between device and application.
Presented example will be very simple to show important communication issues and best practices. You can extend this sample to create more sophisticated applications.
Example communiaction main class Following steps should be performed to establish serial port connection: COM1 - received identifier could be in use by any other application - check it invoking portIdentifier.
While there is opened InputStream by the end-point device in. Each byte is passed to the protocol manager which handles all protocol issues for example recognizes messages from raw bytes.
When end-point device breaks the opened InputStream then in. Because waiting for external device in infinite loop without in.
The interface of Protocol implementation allows to inform protocol manager about each incoming byte and about broken stream situation. Colleaction of received bytes creates String message which could be recognized. When new message is recognized new line character appears or stream closes then onMessage method is called to handle recognized message.
If you develop more complicated example and I am sure you will do logic of triggered actions depending on recognized message should be placed in external class some kind of interpreter. Follow steps below to run two instance of application in Eclipse environment with different command line parameters: Switch between output consoles using button with monitor icon and compare results.
You should have two output consolse with results as presented below. Then OK message was sent as a response. Then acknowledge of OK message was received. Then acknowledge of OK message was sent to the first instance.
OK ACK Conclusions When you receive information about that Sun doesn't support serial communication for Windows system environment you starts desperately searching alternative. In consequence there is very good free alternative which is used in several projects and works fine - RXTX library.In the mids The State of New Jersey announced a "Safe and Clean Neighborhoods Program," designed to improve the quality of community life in twenty-eight cities.
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