OneWire DS9490 and DS1990 Error "no device type for [81]"

[Luis Aguilar]

Hi 

 I'm introducing to OneWire Rpi3,

 i'm ussing  USB Adapter DS9490R for reading Ibuttons from DS1990 family

I used the OneWireViewer demo but i have the following output:

************************************************************

************************************************************

                   Iniciando OneWireViewer                  

************************************************************

************************************************************

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|    PRESS CTRL-C TO EXIT    |

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Apr 05, 2017 2:11:50 PM com.pi4j.io.w1.W1Master readDevices

INFO: no device type for [81] found - ignoring

Apr 05, 2017 2:11:50 PM com.pi4j.io.w1.W1Master readDevices

INFO: no device type for [01] found - ignoring

-------------- Wed Apr 05 14:11:50 CDT 2017

DeviceId:81-00000020cc90

DeviceId:01-0000098b285f

-------------- Wed Apr 05 14:11:51 CDT 2017

DeviceId:81-00000020cc90

DeviceId:01-0000098b285f

-------------- Wed Apr 05 14:11:52 CDT 2017

DeviceId:81-00000020cc90

DeviceId:01-0000098b285f

The source code is this:

public class OneWireViewer {

    public static void main(String[] args) throws IOException {

        final Console console = new Console();

        console.title("Iniciando OneWireViewer");

        console.promptForExit();        

        W1Master w1Master = new W1Master();

        W1MasterWatcher w1MW = new W1MasterWatcher(w1Master);

        W1Device w1d;

                

        while (console.isRunning()) {

            console.println("-------------- "+new Date().toString());

            try {

                for (String deviceId : w1Master.getDeviceIDs()) {              

                    console.println("DeviceId:"+deviceId);                        }

             

                for (W1Device device : w1Master.getDevices()) {                                  

                    console.println("Value:"+device.getValue()+"  toString:"+device.toString());                        

                }

                Thread.sleep(1000);                

            } catch (InterruptedException ex) {

                Logger.getLogger(OneWireViewer.class.getName()).log(Level.SEVERE, null, ex);

            }

        }

        console.println("Fin.");

    }

}

I have three questions:

1.-  What i need to do for correct this error?

2.-  If I have two DS9490R How can i distinguish the master where Ibutton DS1990 is connected?

3.- How can i make more quick the detection of presence or absence of Ibutton on DS9490R? in this demo takes aprox 2 seconds to detect prescence and 100 seconds to detect absence.

thankyou