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I'm not sure too. But notice that the test with tcp to tcp, with rtu encapsulation enabled, has the same problem even if there is no real serial device, and only tcp is involed (see the 3rd post in the thread): run: Master TCP started (50ms, tcp rtu -> tcp rtu) ** TCP, both master and slave encapsulated, no serial device, still has the problem May it me something related to this: http://mango.serotoninsoftware.com/forum/posts/list/532.page ? The only solution we can figure out (to be tested yet), is to close the TpcMaster on receiving a timeout exception, and create a new TcpMaster. This involves issuing only single commands and not using batch. Regards

Changes have been checked into the SF CVS repo.

How can I test if a given slave ID is a valid slave? The testSlaveNode method ends up throwing an ModbusTransportException: Unsupported IP protocol id:...

I reply to myself. Simply set encapsulated to true when creating the IpParameters. IpParameters ip = new IpParameters(); ip.setHost("192.168.15.30"); ip.setEncapsulated(true); ip.setPort(4001); ModbusFactory factory = new ModbusFactory(); ModbusMaster master = factory.createTcpMaster(ip, true);

i have an rs485 to usb cable connected to electricity meter and the device has installed correctly. the files (rxtxcomm.jar & rxtxservial.dll) that i downloaded with mango have been put in the place where it says but i cannot select a port to scan. any ideas?

Hello, I'm using Holding Registers Points to drive registers in a slave PLC. I would like to force these registers but I realise that I can only force to "0" (zéro) but not to "1" ... Is there anybody that faced this situation before ? When I use Coil Status Points, it works well ... I could use Coil Status points to do this but I'm afraid of how Mango will handle requests, I've about 50 points in the field and would be sure that mango will not trigger them individualy , I mean sending 50 "Read Coil" requests instead of sending few "Read Holding Regiters" requests. I've posted another question relative to Logging modbus requests, an answer of this previous question would of course answer to this point ... :shock: Thanks, Nicolas

I am having trouble running more than one modbus device at a time. Here is the error message: 16:57:11: 'Ai32': com.serotonin.modbus4j.exception.ModbusInitException: com.serotonin.io.serial.SerialPortException: gnu.io.NoSuchPortException Any ideas? ron

Hi mlohbihler Thanks for reply i solved my problem thanks a lot

Modbus4J does not have any internal polling mechanisms, no. In Android it would probably be best to create a service that does the polling at the desired rate. If polling, as you say, once per second you should, of course, not be initializing and destroying each time.

Hello. Thanks for the information. I have created and asynctask and I use the master.ini() in this new thread. Works fine. Best regards.

Thanks for the fast response. It turned out as you suspected. I downloaded the cvs version and it worked. btw, the NumericLocator was not required.

Sounds like it could be more of a hardware issue than software, or at least something external is involved. You could try using wireshark to trace the messages, or mention the messages of any events that the data source is raising.

Not sure what you mean by this: the enumerated output like 5.12345E28 How is your data stored? I.e. what does this print out? System.out.println("Result: "+Integer.toHexString(data*)+" === "+Integer.toString(data*)+" === "+data*); If it is not stored as a float, then you need to use another data type.

Quite right. I've checked this change into the repo.

Honestly, i have no idea.

Buenos dias, soy nuevo en el foro Estoy probando m2m para conectar unos dispositivos con protocolo modbus Mi intención es conectar a través de un modem gprs. El sim cuando se conecta arroja una ip Pero siempre el mango me tira este error 'aaa': com.serotonin.modbus4j.exception.ModbusTransportException: java.net.SocketTimeoutException: connect timed out alguien puede ayudarme?

Can you use something like hyperterminal to access the ports?

This is what you need: Attachment: download link

I get the same result. The incoming response looks otherwise ok. The part "011000a80002" looks right. What is suspicious is that the response has 3 bytes at its tail instead of just two: "042993". A CRC is only two bytes.

I got it... My slave id need to be '255', but in the modbus4j the range is 0 to 247. Why i can't put my slave id 255?