Serial port communication in java source code

The Java Communications a. This API may be used to write terminal emulation software, fax software, smart-card reader software, and so on. Developing good software usually means having some clearly defined interfaces.

The high-level diagram of the API interface layers are shown in this figure. In this article we will show you how to use javax. We'll also discuss what the javax. We'll present a small example program that shows you how to communicate to the serial port using this API. At the end of the article we'll briefly detail how this javax. Unlike classical drivers, which come with their own models of communication of asynchronous events, the javax.

Let's say we want to know if there is any new data sitting on the input buffer. We can find that out in two ways -- by polling or listening.

serial port communication in java source code

With polling, the processor checks the buffer periodically to see if there is any new data in the buffer. With listening, the processor waits for an event to occur in the form of new data in the input buffer.

serial port communication in java source code

As soon as new data arrives in the buffer, it sends a notification or event to the processor. Among the various serial interfaces available, two of the most popular are the RSC and RS standards, which define the electrical signal levels and the meaning of various signal lines.

Low-speed serial interfaces typically clock data out as a square wave, with clock coordination provided by start and stop bits.

serial port communication in java source code

RS stands for Recommend Standard ; the C simply refers to the latest revision of the standard. The serial ports on most computers use a subset of the RSC standard. The full RSC standard specifies a pin "D" connector, of which 22 pins are used.

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Most of these pins are not needed for normal PC communications, and indeed, most new PCs are equipped with male D-type connectors having only 9 pins. For more on RS, see the Resources section. This is available free on the Internet. Please see the Resources section for more information. A complete API specification for serial and parallel communication ports. In this article we consider serial ports only. Without a common API in your development efforts, workload will increase because you'll have to provide support to serial devices.

Normally, in RS, there are two signal lines and the rest are intended for control lines. Depending on the type of communication synchronous or asynchronousthe number of control lines selected may vary. This API provides access to the underlying control signals.

A brief diversion here may help you understand something about parity and start and stop bits. Parity was added to RS because communication lines can be noisy. Let's say we send ASCII 0which in hex equals 0x30 or in binarybut along the way someone passes by holding a magnet, causing one of the bits to change. As a result, instead of sending 8 bits as intended, an additional bit is added to the first string of bits sent, making the sum total of bits sent even or odd.

You've got parity.It is meant as an alternative to RxTx and the deprecated Java Communications API, with increased ease-of-use, an enhanced support for timeouts, and the ability to open multiple ports simultaneously. Additionally, this library can be used in any Java project intended for use on the following platforms:.

One of the most convenient features of this library is that it allows you to simply include the JAR file in your custom project, and it will automatically select and load the correct native library for your platform and architecture. As such, you can make use of this library by simply copying the jSerialComm. To access the contents of the library in your project, make sure to import com. You can then generate a list of all available serial ports on your system real or virtualby calling the following static method:.

This will return an array of SerialPort objects through which you can iterate. See the Javadoc Library Reference for a complete overview of this library and its methods. Alternately, if you already know the port descriptor of the port you wish to use e. Note for Linux users : Serial port access is limited to certain users and groups in Linux. To enable user access, you must open a terminal and enter the following commands before jSerialComm will be able to access the ports on your system.

Don't worry if some of the commands fail. All of these groups may not exist on every Linux distro. Note, this process must only be done once for each user :. Replace the username parameter with your current username. If you are not sure what your username is, type whoami and it will tell you.

If you are using SUSE Log out and you should have access to the serial port after logging back in. Additionally, if you are using an automated build system such as Mavenyou can import this library directly into your project as a dependency from the Maven Central Repository instead of copying the. Use one of the following dependency declarations depending on the build system you are using:. Although this library was designed to be as simple and flexible as possible, you can enable a number of different modes of operation via manipulation of the serial port timeout values and the interface through which you choose to access the serial port.

For a description of the various modes of operation available in this library, please refer to the Modes of Operation wiki article. For code-based examples of how to use this library in your own project, we provide a Usage Examples wiki. Finally, you can view the API Documentation for further information on how to use this library. This library was created and developed by Will Hedgecock willhedgecock of Fazecast, Inc. Having trouble with this library? What is jSerialComm?Software written by Ian F.

Darwin and others. BorderLayout; import java. Container; import java.

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GridLayout; import java. ActionEvent; import java. ActionListener; import java. ItemEvent; import java. ItemListener; import java. BufferedReader; import java. IOException; import java. InputStreamReader; import java. PrintStream; import java. Enumeration; import java. HashMap; import javax. CommPort; import javax.

CommPortIdentifier; import javax. NoSuchPortException; import javax.

Open a serial port using Java Communications : COM Port « Development Class « Java

ParallelPort; import javax. PortInUseException; import javax. SerialPort; import javax. UnsupportedCommOperationException; import javax. JButton; import javax. JComboBox; import javax. JDialog; import javax. JFrame; import javax. JLabel; import javax. Pop up the JDialog. Get the port name. Try again.This is more of a follow-up to my previous post about serial programming in Java here and how to install the RXTX libraries here.

I wrote an example program that includes all of those steps in it and are each in their own separate method within the class, but first I will go through my hardware set up. User input is given from the PC through the a Java GUI that contains code for serial communication, which is the code presented here. The Arduino is responsible for reading this data. This set up is pretty much using my computer as a remote control for whatever device is on the Arduino end.

It could be a motor control, on-off switch, etc. However, I did create a GUI for testing purposes. See the Code Downloads section for the actual files. Above is the picture of the GUI complete with the buttons that I use to interact with the program.

I also added key bindings which I can use to control the throttle. When the program is first started, none of the GUI elements will work except for the combo box and the connect button.

Once a successful connection is made the controls are enabled. This is done through the use of the setConnected true and the toggleControls methods shown in the example code that follows.

Depending on the Java IDE it might already know to tell you to use these imports except for the first one. I named my class Communicatorbut the name is really up to the programmer. The name pretty much reflects its intended use.

The class should also implement the SerialPortEventListener class. This is a class in RXTX and is required in order to receive incoming data. This method will be defined later. Below are the variables and constants that I defined in my class.

What the variables are for is in the comments but a more detailed explanation will follow.In this tutorial, I demonstrate how to build up a serial connection between a Java Application and an Arduino Uno. The tutorial is divided into two parts: In the first part, it is explained how to send text digits from a Java Application to an Arduino. Have a look at the fritzing file for more details:.

Basically, the code just waits for bytes ready to be read by the serial port. I made use of Maven to set up the dependency between my Java project and the jSerialComm library. If you also use Maven for your project, then my POM file might be of use to you:. The actual Java source code is only a single class with a main method.

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A serial connection is established. Then, five digits are written to the serial port. Finally, the serial connection is closed:. The main important method call is SerialPort.

The method has only one argument which has to be the device name of your Arduino Uno. Therefore, it is very likely that you need to change this argument value. In order to upload code to an Arduino, you have to select the correct device name of the corresponding Arduino.

Luckily, the same device name is needed by the jSerialComm library. Execution When you have uploaded the source code to the Arduino and started the java application, you should see that the digits appear on the LCM IIC V1 module. Sometimes, I have problems executing this code, if I use cheap Arduino clones. Luckily, it always executes perfectly on my original Arduino Uno from Italy. In the second part of this tutorial, the digits coming from the Java application are printed to the default serial connection of the Arduino.

Unfortunately, as a consequence, the standard USB connection cannot be used by the Java application since the serial monitor will already catch the serial port as soon as we open it. As we will use this adapter only to send data from the Java application, we can ignore the RX pin.

serial port communication in java source code

Arduino Source Code: The Arduino program makes use of a so-called software serial. When a software serial object is initialized, it requires the pin numbers of the receive and transmit pin. As we do not plan to transmit text from the Arduino Uno, we can set the transmit pin to any number.

Two way communcation with the serial port

Here, I simply set it to 6. Java source code: The Java application is basically the same than the one used in part one of this tutorial. Conveniently, you can again make use of the Arduino IDE as it will show you the name of the serial adapter, too.

Execution: If everything was successfully executed, the serial monitor of the Arduino IDE should show five received digits.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. But with that API, it seems have some issues with serial port communication such as get delay to bind with COM port, lots some characters on device output received etc.

Is there any better API for this? With many articles I have seen Java haven't good support for Serial port communication. Please note that I'm the author of the library, but I created it because no one fit my needs for example it's hard to re-compile the native part of jSSC.

JSerial is MIT-licensed you can use it in closed-source applications and delivered with a full Visual Studio project if you need to modify the native part. I had a pretty nice experience with JSerialComm library. I've used this library on Linux and Windows 7 operating systems successfully.

But I am not sure about windows Also developers say that it works on OS X and Android. Besides said above, with this library you don't need to install any native library, it already there.

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Arduino to PC communication using USB serial and Java

Active 1 year, 9 months ago. Viewed 8k times. Channa Channa 3, 11 11 gold badges 47 47 silver badges 87 87 bronze badges. I am sure you solved this topic. Which library would you recommend today?

Active Oldest Votes. Hope it may be useful USB serial is available on nearly all Arduino based boards. Further, there are serial interface Java libraries that can connect to an Arduino. If you are unfamiliar with data communications in general, take a look a the introduction to data communications article ; although it does not cover serial communication, it is still a good starting point for the unfamiliar.

For an out the box complete solution checkout our new BETA library tcMenu library for Arduino including remote control. TcMenu not only provides a full menu system with designer, but also remote control from Arduino to Java using RS or Ethernet.

Take note of the ports used for the various connectors as they will be needed to set up the sketch later. Note that this script uses PWM contrast based on the link above. Now wire the switches in as well, each switch should be wired to the board as per the example circuit on the left never use less that a 4k7 resistor for this or the current drain will increase.

At 4k7 the current drain for each switch when on is about 1mA; which is not particurly high even with a few switches normally on. At this point you should have both the 20x4 display and a few switches connected according the circuit above. Now is the time to load the code onto the Arduino device. In the script there are some changes that need to be made, in order to tell the script where to expect the LCD display and also the buttons.

Once everything is wired up, you will need to enter the pins used for the display and switches noted earlier into the sketch. Change the constants at the top of the sketch as shown in the example below using your own settings. In my example I had the buttons connected on bins Now we configure the serial communication speed, I set it to be baud but over USB, it can reliably run faster.

As long as all is wired up correctly you should be able to run the script on your Arduino, the display should initialise and look like the example below. If not, switch off and check your wiring and code carefully. The PWM contrast setting can be adjusted in the setup section of the script. There are several examples contained within the code, you want to look in the com. In order to run the project, run the class:.

If all is working at this point you should see the serial settings dialog requesting the port and speed above leftchoose the usual serial COM port that Arduino studio is using, and set the speed to or whatever you set the Arduino side to. Once done you should see the main screen above rightConnection status is shown in the lower left corner, and the status of the last command sent on the lower right.

To send a text message to the server, type some text in the text box and press send, the text will be transmitted to the server and displayed on the 20x4 display.

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Likewise if you press any of the switches connected to the Arduino, they will show on the Java UI at the next status interval set to approx 1 second on the sketch. There is a combined status update sent by the board every second that includes the latest switch states. The Java application is split into two parts, User interface and data communication components, the communication components are in the protocol package, while the user interface parts are in the ui package.

They can be loaded into Scene Builder and designed graphically. There is a resources directory that contains both of the FXML design files and a logo. Get the code from github. We use cookies to analyse traffic and to personalise content.

We also embed Twitter, Youtube and Disqus content on some pages, these companies have their own privacy policies. Please see our privacy policy should you need more information or wish to adjust your settings. Setting up the arduino sketch to run Once everything is wired up, you will need to enter the pins used for the display and switches noted earlier into the sketch.

In order to run the project, run the class: com.