public class RtuModBusDemo {
// 设定MODBUS网络上从站地址
private final static int SLAVE_ADDRESS = 1;
// 串行波特率
private final static int BAUD_RATE = 9600;
public static void main(String[] args) {
SerialParameters serialParameters = new SerialParameters();
// 设定MODBUS通讯的串行口
serialParameters.setCommPortId("COM2");
// 设定成无奇偶校验
serialParameters.setParity(1);
// 设定成数据位是8位
serialParameters.setDataBits(8);
// 设定为1个停止位
serialParameters.setStopBits(1);
// 设定端口名称
serialParameters.setPortOwnerName("portName");
// 设定端口波特率
serialParameters.setBaudRate(BAUD_RATE);
// 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.init();
readHoldingRegistersTest(master, SLAVE_ADDRESS, 1, 1);
} catch (ModbusInitException e) {
e.printStackTrace();
} finally {
master.destroy();
}
}
/**
* 读输入信号
* @param master 主站
* @param slaveId 从站地址
* @param start 起始偏移量
* @param len 待读的个数
*/
public static void readDiscreteInputTest(ModbusMaster master, int slaveId, int start, int len) {
try {
ReadDiscreteInputsRequest request = new ReadDiscreteInputsRequest(slaveId, start, len);
ReadDiscreteInputsResponse response = (ReadDiscreteInputsResponse) master.send(request);
if (response.isException())
System.out.println("Exception response: message=" + response.getExceptionMessage());
else
System.out.println(Arrays.toString(response.getBooleanData()));
}
catch (ModbusTransportException e) {
e.printStackTrace();
}
}
/**
* 读输入寄存器上的内容
* @param master 主站
* @param slaveId 从站地址
* @param start 起始地址的偏移量
* @param len 待读寄存器的个数
*/
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(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();
}
}
/**
* 批量写数据到寄存器
* @param master 主站
* @param slaveId 从站地址
* @param start 起始地址的偏移量
* @param values 待写数据
*/
public static void writeRegistersTest(ModbusMaster master, int slaveId, int start, short[] values) {
try {
WriteRegistersRequest request = new WriteRegistersRequest(slaveId, start, values);
WriteRegistersResponse response = (WriteRegistersResponse) master.send(request);
if (response.isException()){
System.out.println("Exception response: message=" + response.getExceptionMessage());
}
else {
System.out.println("Success");
}
}
catch (ModbusTransportException e) {
e.printStackTrace();
}
}
}
