Multidrop Serial Port RTU

[Henry Irawan]

Hi, 

I am trying to create a Master using a serial port to monitor 2 Outstations (  RTU1 connects to RTU2 using serial cable). 

My PC connects to RTU1 using a serial port (COM 7), and I am expecting to be able to read data from both RTU1 and RTU2 using the multidrop option, where RTU1 slave address=1, and RTU2 slave address=2

Here is my code:

            
             IDNP3Manager dnp3Manager = DNP3ManagerFactory.CreateManager(1, new CustomPrintingLogAdapter());
             var DNPChannelSerial = dnp3Manager.AddSerial(
                 "SerialPort",
                 LogLevels.ALL,
                 new ChannelRetry(TimeSpan.FromSeconds(1), TimeSpan.FromSeconds(30), TimeSpan.FromSeconds(1)),
                 new SerialSettings(portAddress, 9600, 8, StopBits.None, Parity.None, FlowControl.None),
                 new CustomChannelListener()
             );


             MasterStackConfig masterStackConfig = new MasterStackConfig();
            masterStackConfig.link.localAddr = 1024;
            masterStackConfig.link.remoteAddr = 1;
            masterStackConfig.master.disableUnsolOnStartup = true;

            var newMaster = DNPChannelSerial.AddMaster("RTU1", new PrintingSOEHandler(), DefaultMasterApplication.Instance, masterStackConfig);
            var integrityPoll = newMaster.AddClassScan(ClassField.AllClasses, TimeSpan.FromMinutes(1), new PrintingSEOHandler(), TaskConfig.Default);
            var classPoll = newMaster.AddClassScan(ClassField.AllEventClasses, TimeSpan.FromSeconds(15), new new PrintingSEOHandler(), TaskConfig.Default);


             MasterStackConfig masterStackConfig2 = new MasterStackConfig();
            masterStackConfig2.link.localAddr = 1024;
            masterStackConfig2.link.remoteAddr = 2;
            masterStackConfig2.master.disableUnsolOnStartup = true;

            var newMaster2 = DNPChannelSerial.AddMaster("RTU2", new PrintingSOEHandler(), DefaultMasterApplication.Instance, masterStackConfig2);
            var integrityPoll = newMaster2.AddClassScan(ClassField.AllClasses, TimeSpan.FromMinutes(1), new PrintingSEOHandler(), TaskConfig.Default);
            var classPoll = newMaster2.AddClassScan(ClassField.AllEventClasses, TimeSpan.FromSeconds(15), new PrintingSEOHandler(), TaskConfig.Default);


             newMaster.Enable();
            newMaster2.Enable();

After running this code, I was able to get data from RTU1, but cannot get data from RTU2 due to this error message on Log: 

RTU2 - WARN - Task was explicitly rejected via response with error IIN bit(s): Disable Unsolicited

I also already tried changing the disableUnsolOnStartup config but the same result.

This error only occurs when I am trying to create 2 masters on 1 channel for multidrop.

Is there something wrong with the code?

Thanks