Java实现串口,我已经实现了读取数据,但是往串口发送数据一点都不会,下面是我的读取数据的代码,请问怎么在下面的代码基础上增加往串口发送数据的功能
public class VersolApplication {
// 设定MODBUS网络上从站地址
private final static int SLAVE_ADDRESS = 201;
//串行波特率
private final static int BAUD_RATE = 9600;
public static void main(String[] args) {
SpringApplication.run(VersolApplication.class, args);
try {
Runtime.getRuntime().exec("cmd /c start http://localhost:8080/index");
modbus(args);
} catch (Exception e) {
e.printStackTrace();
}
}
public static void modbus(String[] args){
SerialPortWrapper serialParameters = new
SerialPortWrapperImpl("COM3", BAUD_RATE, 8, 1, 0, 0, 0);
/* 创建ModbusFactory工厂实例 */
ModbusFactory modbusFactory = new ModbusFactory();
/* 创建ModbusMaster实例 */
ModbusMaster master = modbusFactory.createRtuMaster(serialParameters);
/* 初始化 */
try {
master.setTimeout(3000);
master.setRetries(3);
master.init();
readHoldingRegistersTest(master, SLAVE_ADDRESS, 79, 4);
} catch (ModbusInitException e) {
e.printStackTrace();
} finally {
master.destroy();
}
}
private static void readHoldingRegistersTest(ModbusMaster master, int slaveId, int start, int len) {
try {
ReadHoldingRegistersRequest request = new ReadHoldingRegistersRequest(slaveId, start, len);
ReadHoldingRegistersResponse response = (ReadHoldingRegistersResponse)master.send(request);
if (response.isException()) {
System.out.println("Exception response: message=" + response.getExceptionMessage());
} else {
System.out.println("success"+ Arrays.toString(response.getShortData()));
short[] list = response.getShortData();
for (int i = 0; i < list.length; i++) {
System.out.print(list[i] + " ");
}
}
} catch (ModbusTransportException e) {
e.printStackTrace();
}
}
}