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Multi serial port application

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  • V veera

    i have tried both the things not able to open the port .....

    mrjjM Offline
    mrjjM Offline
    mrjj
    Lifetime Qt Champion
    wrote on last edited by mrjj
    #23

    @veera

    so are you sure PC has that port ?

    if using a serial usb adapter, it has other name.

    If you cannot open port using the Terminal sample then
    something is wrong outside Qt.

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    • V Offline
      V Offline
      veera
      wrote on last edited by
      #24

      yes having two ports only ttyS4 and ttyS5 i am not using any usb to serial converter i am directly connecting with serial port only .....i have tried terminal example its giving the permission error means sudo permission .....

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      • V Offline
        V Offline
        veera
        wrote on last edited by
        #25

        permission is denied error while opening the port in Terminal Sample...

        jsulmJ 1 Reply Last reply
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        • V veera

          permission is denied error while opening the port in Terminal Sample...

          jsulmJ Offline
          jsulmJ Offline
          jsulm
          Lifetime Qt Champion
          wrote on last edited by
          #26

          @veera What does

          ls -lh /dev/ttyS4
          

          say?

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

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          • mrdebugM Offline
            mrdebugM Offline
            mrdebug
            wrote on last edited by
            #27

            Are you in dialout group?

            Need programmers to hire?
            www.labcsp.com
            www.denisgottardello.it
            GMT+1
            Skype: mrdebug

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            • V Offline
              V Offline
              veera
              wrote on last edited by
              #28

              i tried using this command on the qt project path also not able to open the serial ports.....

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              • V Offline
                V Offline
                veera
                wrote on last edited by
                #29

                yes i am in dialout group....

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                • V Offline
                  V Offline
                  veera
                  wrote on last edited by
                  #30

                  crw-rw---- 1 root dialout 4, 68 Dec 11 13:22 /dev/ttyS4

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                  • V Offline
                    V Offline
                    veera
                    wrote on last edited by
                    #31

                    @jsulm said in multi serial port application:

                    ls -lh /dev/ttyS4

                    crw-rw---- 1 root dialout 4, 68 Dec 11 13:22 /dev/ttyS4

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                    • mrdebugM Offline
                      mrdebugM Offline
                      mrdebug
                      wrote on last edited by
                      #32

                      Are you sure you really have 4 serial ports? Which kind of machine have you got?
                      In some case, with a beaglebone board for example, you have to enable the third and fourth serial port with a special kernel parameter.

                      Need programmers to hire?
                      www.labcsp.com
                      www.denisgottardello.it
                      GMT+1
                      Skype: mrdebug

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                      • mrjjM Offline
                        mrjjM Offline
                        mrjj
                        Lifetime Qt Champion
                        wrote on last edited by
                        #33

                        Hi
                        Often you have to add your user to the dialout group to be allowed to use it

                        usermod -a -G dialout MY_USER_NAME

                        as @mrdebug asks/says

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                        • V Offline
                          V Offline
                          veera
                          wrote on last edited by
                          #34

                          @mrdebug
                          I have only two serial ports i am connecting slot machine to my desktop computer.....need to connect from desktop to slot machine i am struggling to open the serial port please help me i have added like this

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                          • V Offline
                            V Offline
                            veera
                            wrote on last edited by
                            #35

                            sudo usermod -a -G dialout veera

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                            • V Offline
                              V Offline
                              veera
                              wrote on last edited by
                              #36

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

                              jsulmJ 1 Reply Last reply
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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 Offline
                                jsulmJ Offline
                                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
                                      0
                                      • 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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