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Multi serial port application

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  • V veera

    in my desktop using two serial ports using right now may be in built its four i guess.....

    jsulmJ Online
    jsulmJ Online
    jsulm
    Lifetime Qt Champion
    wrote on last edited by
    #37

    @veera Make sure your user is member of dialout group

    https://forum.qt.io/topic/113070/qt-code-of-conduct

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    • mrjjM Offline
      mrjjM Offline
      mrjj
      Lifetime Qt Champion
      wrote on last edited by
      #38

      Also if you are having ONLY 2 serial ports why are you then
      trying the /dev/ttyS4 port ???
      i would giess on
      /dev/ttyS0
      or
      /dev/ttyS1

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      • V Offline
        V Offline
        veera
        wrote on last edited by
        #39

        i have verified with minicom slot machine cable is connected with ttyS4 so i am trying with this port

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        • V Offline
          V Offline
          veera
          wrote on last edited by
          #40

          i have tried ttyS0 and ttyS1 also it is not able to open the serial port....

          mrjjM 1 Reply Last reply
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          • V veera

            i have tried ttyS0 and ttyS1 also it is not able to open the serial port....

            mrjjM Offline
            mrjjM Offline
            mrjj
            Lifetime Qt Champion
            wrote on last edited by mrjj
            #41

            @veera

            ok. not sure what could be wrong with your linux if you have added
            yourself (your username) to dial out group and you are sure that the port exists.

            What linux are you using ?

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            • V Offline
              V Offline
              veera
              wrote on last edited by
              #42

              ubuntu 16.04 LTS ,i opened serial port now if i choose the run in terminal its opening please help how to set sudo password in qt instead of choosing run in terminal directly need to open

              aha_1980A 1 Reply Last reply
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              • V veera

                ubuntu 16.04 LTS ,i opened serial port now if i choose the run in terminal its opening please help how to set sudo password in qt instead of choosing run in terminal directly need to open

                aha_1980A Offline
                aha_1980A Offline
                aha_1980
                Lifetime Qt Champion
                wrote on last edited by
                #43

                @veera said in multi serial port application:

                ubuntu 16.04 LTS ,i opened serial port now if i choose the run in terminal its opening please help how to set sudo password in qt instead of choosing run in terminal directly need to open

                If you need the sudo password than setting yourself into dialout group did not work!

                Have your rebooted your PC after you put yourself into dialout?

                Hint: call error() when opening the serial port fails to get more information about the error.

                Qt has to stay free or it will die.

                jsulmJ 1 Reply Last reply
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                • aha_1980A aha_1980

                  @veera said in multi serial port application:

                  ubuntu 16.04 LTS ,i opened serial port now if i choose the run in terminal its opening please help how to set sudo password in qt instead of choosing run in terminal directly need to open

                  If you need the sudo password than setting yourself into dialout group did not work!

                  Have your rebooted your PC after you put yourself into dialout?

                  Hint: call error() when opening the serial port fails to get more information about the error.

                  jsulmJ Online
                  jsulmJ Online
                  jsulm
                  Lifetime Qt Champion
                  wrote on last edited by
                  #44

                  @aha_1980 @veera Reboot is not needed: just log off and on again after adding yourself to the group.

                  https://forum.qt.io/topic/113070/qt-code-of-conduct

                  aha_1980A 1 Reply Last reply
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                  • V Offline
                    V Offline
                    veera
                    wrote on last edited by
                    #45

                    yes i have rebooted system now opened successfully ......Thank you so much

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                    • V Offline
                      V Offline
                      veera
                      wrote on last edited by
                      #46

                      how to write and read the hexbytes such as unsigned char ch1[] = {0X01,0X04,0X0F} etc from serial port......

                      mrjjM 1 Reply Last reply
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                      • V veera

                        how to write and read the hexbytes such as unsigned char ch1[] = {0X01,0X04,0X0F} etc from serial port......

                        mrjjM Offline
                        mrjjM Offline
                        mrjj
                        Lifetime Qt Champion
                        wrote on last edited by
                        #47

                        @veera
                        Hi
                        Hex is a notation and not a format.
                        The bytes are still just bytes.
                        QByteArray has
                        QByteArray::fromHex
                        http://doc.qt.io/qt-5/qbytearray.html#fromHex
                        and
                        http://doc.qt.io/qt-5/qbytearray.html#toHex

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                        • jsulmJ jsulm

                          @aha_1980 @veera Reboot is not needed: just log off and on again after adding yourself to the group.

                          aha_1980A Offline
                          aha_1980A Offline
                          aha_1980
                          Lifetime Qt Champion
                          wrote on last edited by
                          #48

                          @jsulm I know :) But it does not hurt either and before explaining what logging out an in again means...

                          Qt has to stay free or it will die.

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                          • V Offline
                            V Offline
                            veera
                            wrote on last edited by
                            #49

                            @mrjj ,
                            Okay thanks i will try it now....

                            1 Reply Last reply
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