com.invertor.modbus.serial.SerialPortJavaComm Maven / Gradle / Ivy
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Implementation of the Modbus protocol in Java language
package com.invertor.modbus.serial;
import com.invertor.modbus.Modbus;
import javax.comm.*;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.concurrent.atomic.AtomicBoolean;
/*
* Copyright (C) 2017 Vladislav Y. Kochedykov
*
* [http://jlibmodbus.sourceforge.net]
*
* This file is part of JLibModbus.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Authors: Vladislav Y. Kochedykov, software engineer.
* email: [email protected]
*/
public class SerialPortJavaComm extends com.invertor.modbus.serial.SerialPort implements SerialPortEventListener {
private javax.comm.SerialPort port;
private AtomicBoolean opened = new AtomicBoolean(false);
private InputStream in;
private OutputStream out;
public SerialPortJavaComm(SerialParameters sp) throws SerialPortException {
super(sp);
}
@Override
public void write(int b) throws IOException {
if (!isOpened()) {
throw new IOException("Port not opened");
}
try {
out.write((byte) b);
} catch (Exception e) {
throw new IOException(e);
}
}
@Override
public void write(byte[] bytes) throws IOException {
if (!isOpened()) {
throw new IOException("Port not opened");
}
try {
out.write(bytes);
} catch (Exception e) {
throw new IOException(e);
}
}
@Override
public void open() throws SerialPortException {
try {
SerialParameters sp = getSerialParameters();
CommPortIdentifier portIdentifier;
portIdentifier = CommPortIdentifier.getPortIdentifier(sp.getDevice());
if (portIdentifier.isCurrentlyOwned()) {
String msg = "Cannot open serial port " + sp.getDevice();
Modbus.log().warning(msg);
throw new SerialPortException(msg);
} else {
CommPort commPort = portIdentifier.open(this.getClass().getName(), Modbus.MAX_CONNECTION_TIMEOUT);
if (commPort instanceof javax.comm.SerialPort) {
port = (javax.comm.SerialPort) commPort;
port.setSerialPortParams(sp.getBaudRate(), sp.getDataBits(), sp.getStopBits(), sp.getParity().getValue());
port.setFlowControlMode(javax.comm.SerialPort.FLOWCONTROL_NONE);
in = port.getInputStream();
out = port.getOutputStream();
port.enableReceiveTimeout(Modbus.MAX_RESPONSE_TIMEOUT);
setOpened(true);
} else {
Modbus.log().severe(sp.getDevice() + " is not a serial port.");
}
}
} catch (NoSuchPortException e) {
throw new SerialPortException(e);
} catch (Exception ex) {
throw new SerialPortException(ex);
}
}
@Override
public void setReadTimeout(int readTimeout) {
super.setReadTimeout(readTimeout);
try {
if (isOpened())
port.enableReceiveTimeout(readTimeout);
} catch (UnsupportedCommOperationException e) {
Modbus.log().warning(e.getLocalizedMessage());
}
}
@Override
public int read() throws IOException {
if (!isOpened()) {
throw new IOException("Port not opened");
}
int c;
try {
c = in.read();
} catch (Exception e) {
throw new IOException(e);
}
if (c > -1)
return c;
else
throw new IOException("Read timeout");
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
if (!isOpened()) {
throw new IOException("Port not opened");
}
int c;
try {
c = in.read(b, off, len);
} catch (Exception e) {
throw new IOException(e);
}
if (c > -1)
return c;
else
throw new IOException("Read timeout");
}
@Override
public void close() {
try {
if (isOpened()) {
setOpened(false);
in.close();
out.close();
port.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public boolean isOpened() {
return opened.get();
}
public void setOpened(boolean opened) {
this.opened.set(opened);
}
@Override
public void serialEvent(SerialPortEvent serialPortEvent) {
switch (serialPortEvent.getEventType()) {
case SerialPortEvent.OE:
case SerialPortEvent.PE:
case SerialPortEvent.FE:
Modbus.log().warning(port.getName() + ": framing error.");
break;
default:
break;
}
}
}