Java jSerialComm linux按照modbus地址只读取modbus-rtu数据代码,依赖,
时间: 2023-07-08 22:04:16 浏览: 280
read modbus.rar_MODBUS-RTU_modbus_低压电器
以下是使用Java jSerialComm读取Modbus RTU数据的示例代码:
```java
import com.fazecast.jSerialComm.SerialPort;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Arrays;
public class ModbusRTUReader {
private static final int BAUD_RATE = 9600;
private static final int DATA_BITS = 8;
private static final int STOP_BITS = 1;
private static final int PARITY = SerialPort.NO_PARITY;
private static final int TIMEOUT = 1000;
private static final byte[] READ_COILS_REQUEST = new byte[]{0x01, 0x01, 0x00, 0x00, 0x00, 0x08, (byte) 0xC5, (byte) 0xCD};
public static void main(String[] args) {
SerialPort serialPort = SerialPort.getCommPort("/dev/ttyUSB0");
serialPort.setBaudRate(BAUD_RATE);
serialPort.setNumDataBits(DATA_BITS);
serialPort.setNumStopBits(STOP_BITS);
serialPort.setParity(PARITY);
if (!serialPort.openPort()) {
System.out.println("Failed to open serial port!");
return;
}
serialPort.setComPortTimeouts(SerialPort.TIMEOUT_READ_BLOCKING, TIMEOUT, 0);
try {
InputStream inputStream = serialPort.getInputStream();
OutputStream outputStream = serialPort.getOutputStream();
outputStream.write(READ_COILS_REQUEST);
outputStream.flush();
byte[] response = new byte[256];
int bytesRead = inputStream.read(response);
if (bytesRead > 0) {
byte[] data = Arrays.copyOf(response, bytesRead);
// Parse the response and extract the relevant data
// See the Modbus RTU specification for details on the response format
} else {
System.out.println("Failed to read data from serial port!");
}
} catch (IOException e) {
e.printStackTrace();
}
serialPort.closePort();
}
}
```
这个示例代码使用了jSerialComm库(可以通过Maven等方式导入),并且读取了Modbus RTU设备上的线圈状态(使用了0x0000到0x0007的地址)。
你需要根据你的具体设备和要读取的数据来修改代码中的请求命令(READ_COILS_REQUEST)和解析响应数据的代码。
当然,还需要确保设备的串口连接、波特率、数据位、停止位、校验位等参数都正确设置。
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