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Open ttyr0 port under linux

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    #1

    Open ttyr0 port under linux

    Testing the PI under Linux. The serial interfaces that I can select for example is /dev/ttyS0. However the data is on Port ttyr0.

    Running under Ubuntu 20.04 LTS.

    How can this be solved?

    ---
    John
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    #2
    How are you connecting the hardware serial device to the RPi? Are you connecting directly to the RPi pins to a TTL to RS-232 device?

    Googling read that a Rocket Port modem RS-232 connection would appear as a ttyRX connection under dev.
    - Pete

    Auto mator
    Homeseer 3 Pro - 3.0.0.548 (Linux) - Ubuntu 18.04/W7e 64 bit Intel Haswell CPU 16Gb

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      #3
      Originally posted by Pete View Post
      How are you connecting the hardware serial device to the RPi? Are you connecting directly to the RPi pins to a TTL to RS-232 device?

      Googling read that a Rocket Port modem RS-232 connection would appear as a ttyRX connection under dev.
      To be clear.

      I i'm running Ubuntu 20.04 LTS in a VM. Hardware connected using a Moxa Serial server.

      Moxa solved the ttyr0 ttyS0 issue.

      At least it is working in Node-Red, but not in the Modbus-PI.

      ---
      John

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        #4
        I am not familiar with the ModBus-Pi and never have utilized a Moxa serial server.

        Thinking I paid some $20 for the 1 watt LoRa serial modems mentioned above (from China) which appear to be similiar to the Moxa serial server.

        Each modem has an RS-232 port on it.
        - Pete

        Auto mator
        Homeseer 3 Pro - 3.0.0.548 (Linux) - Ubuntu 18.04/W7e 64 bit Intel Haswell CPU 16Gb

        HS4 Pro - Ubuntu 22.04 / Lenova Tiny M900 / 32Gb Ram
        HSTouch on Intel tabletop tablets (Jogglers) - Asus AIO - Windows 11
        X10, UPB, Zigbee, ZWave and Wifi MQTT automation-Tasmota-Espurna. OmniPro 2, Russound zoned audio, Alexa, Cheaper RFID, W800 and Home Assistant

        Comment

          #5
          Originally posted by Pete View Post
          I am not familiar with the ModBus-Pi and never have utilized a Moxa serial server.

          Thinking I paid some $20 for the 1 watt LoRa serial modems mentioned above (from China) which appear to be similiar to the Moxa serial server.

          Each modem has an RS-232 port on it.
          The Moxa's one are good. Even better than the VSCOM devices. Issues that I had with the VSCOM devices I did never see after the switch to Moxa.

          ---
          John

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            #6
            Curious what are you using the Moxa serial servers for?
            - Pete

            Auto mator
            Homeseer 3 Pro - 3.0.0.548 (Linux) - Ubuntu 18.04/W7e 64 bit Intel Haswell CPU 16Gb

            HS4 Pro - Ubuntu 22.04 / Lenova Tiny M900 / 32Gb Ram
            HSTouch on Intel tabletop tablets (Jogglers) - Asus AIO - Windows 11
            X10, UPB, Zigbee, ZWave and Wifi MQTT automation-Tasmota-Espurna. OmniPro 2, Russound zoned audio, Alexa, Cheaper RFID, W800 and Home Assistant

            Comment

              #7
              Originally posted by Pete View Post
              Curious what are you using the Moxa serial servers for?
              3 x PV inverter
              Heating Pump
              audio and video equipment

              ---
              John

              Comment

                #8
                beerygaz

                I can read the data on port /dev/ttyS0 using Node-RED, Modpoll. However your plug-in indicates unreachable.

                As this is a test environment migrated from Windows nothing is changed.

                Any idea how to fix?

                ---
                John

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