EasyModbusTCP/UDP/RTU .java Wiki
Modbus TCP, Modbus UDP and Modbus RTU client/server Java library
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package run; import de.re.easymodbus.server.*; public class run { public static void main(String[] args) { ModbusServer modbusServer = new ModbusServer(); modbusServer.setPort(1522);//Note that Standard Port for Modbus TCP communication is 502 modbusServer.coils[1] = true; modbusServer.holdingRegisters[1] = 1234; try { modbusServer.Listen(); } catch (java.io.IOException | Exceptions.ModbusException e) { } } }