EasyModbusTCP/UDP/RTU .java Wiki
Modbus TCP, Modbus UDP and Modbus RTU client/server Java library
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public static void main(String[] args) { ModbusClient modbusClient = new ModbusClient("127.0.0.1", 1536); try { modbusClient.Connect(); //Write Float value to Register 10 and 11 modbusClient.WriteMultipleRegisters(9, ModbusClient.ConvertFloatToTwoRegisters((float)(1323.55))); //Write 32 bit value to Register 12 and 13 modbusClient.WriteMultipleRegisters(11, ModbusClient.ConvertDoubleToTwoRegisters((1323554))); //Read Float Value from Register 10 and 11 System.out.println(ModbusClient.ConvertRegistersToFloat(modbusClient.ReadHoldingRegisters(9, 2))); //Read 32 Bit Value from Register 12 and 13 System.out.println(ModbusClient.ConvertRegistersToDouble(modbusClient.ReadHoldingRegisters(11, 2))); } catch (Exception e) { System.out.println(e.toString()); } }