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    How to disable and enable the 1Wire bus (M503)

    Official EVOK API
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    • Martin Kudláček
      Martin Kudláček administrators @Vesa Kauppinen last edited by

      @vesa-kauppinen

      Sorry, I've never used the pollmb.py. Would be the mbpoll example sufficient? You can install the mbpoll from our repository: apt update && apt install mbpoll

      Martin

      Vesa Kauppinen 1 Reply Last reply Reply Quote 0
      • Vesa Kauppinen
        Vesa Kauppinen @Martin Kudláček last edited by

        @martin-kudláček

        Yes. If you can give mbpoll example that would be great!

        :)

        Br,
        Vesa

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        • Martin Kudláček
          Martin Kudláček administrators @Vesa Kauppinen last edited by

          @vesa-kauppinen

          For Group 1 on M503

          Verify the status of the MWD (if 0 - MWD disable, if 1 - MWD enabled but never rebooted, if 2 - MWD enabled and already rebooted):
          mbpoll -m tcp -a 0 127.0.0.1 -0 -1 -r 6

          Set the MWD timeout to 5000ms:
          mbpoll -m tcp -a 0 127.0.0.1 -0 -r 1008 5000

          Enable the MWD:
          mbpoll -m tcp -a 0 127.0.0.1 -0 -r 6 1

          Write the settings to the NVRAM:
          mbpoll -m tcp -a 0 127.0.0.1 -0 -t 0 -r 1003 1

          Verify the MWD by stopping the UniPi Modbus TCP server:
          sudo systemctl stop unipitcp

          The both lines of LEDs should blink for 1sec after the MWD timeout

          Disable the MWD:
          mbpoll -m tcp -a 0 127.0.0.1 -0 -r 6 0

          Write the settings to the NVRAM:
          mbpoll -m tcp -a 0 127.0.0.1 -0 -t 0 -r 1003 1

          For Group 2 on M503
          Use the MWD control register 114 instead of 6
          Use the MWD timeout register 1108 instead of 1008
          Use the Save configuration coil 1103 instead of 1003

          Vesa Kauppinen 1 Reply Last reply Reply Quote 0
          • Vesa Kauppinen
            Vesa Kauppinen @Martin Kudláček last edited by

            @martin-kudláček

            Thanks for the good instructions! After enabling MWD, setting timeout and writing the settings:

            mbpoll -m tcp -a 0 127.0.0.1 -0 -1 -r 6
            mbpoll 1.2-6 - FieldTalk(tm) Modbus(R) Master Simulator
            Copyright (c) 2015 epsilonRT, All rights reserved.
            This software is governed by the CeCILL license <http://www.cecill.info>
            
            Protocol configuration: Modbus TCP
            Slave configuration...: address = [0]
                                    start reference = 6, count = 1
            Communication.........: 127.0.0.1, port 502, t/o 1.00 s, poll rate 1000 ms
            Data type.............: 16-bit register, output (holding) register table
            
            -- Polling slave 0...
            [6]:    3
            

            ...or...

            mbpoll -m tcp -a 0 127.0.0.1 -0 -1 -r 114
            mbpoll 1.2-6 - FieldTalk(tm) Modbus(R) Master Simulator
            Copyright (c) 2015 epsilonRT, All rights reserved.
            This software is governed by the CeCILL license <http://www.cecill.info>
            
            Protocol configuration: Modbus TCP
            Slave configuration...: address = [0]
                                    start reference = 114, count = 1
            Communication.........: 127.0.0.1, port 502, t/o 1.00 s, poll rate 1000 ms
            Data type.............: 16-bit register, output (holding) register table
            
            -- Polling slave 0...
            [114]:  3
            

            What does that result (3) mean? Its not 0, 1 or 2.

            Btw

            sudo systemctl stop unipitcp
            

            should be

            sudo systemctl stop neurontcp
            

            in Neuron M503...right??

            Br,
            Vesa

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            • Martin Kudláček
              Martin Kudláček administrators @Vesa Kauppinen last edited by Martin Kudláček

              Hi @vesa-kauppinen,
              sorry the value 3 is 1 + 2, which means board has MWD enabled and the MWD already rebooted the board.

              The service is called unipitcp, but in older packages it was called neurontcp. The service is the same for Neurons and Axons, so we renamed it to unipitcp to make it more clear.

              Best regards,
              Martin

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              • Vesa Kauppinen
                Vesa Kauppinen @Martin Kudláček last edited by Vesa Kauppinen

                @martin-kudláček

                Aaaaa...of course :D

                But what about this: either 11 or 3

                root@residevice:~# mbpoll -m tcp -a 0 127.0.0.1 -0 -1 -r 6
                mbpoll 1.2-6 - FieldTalk(tm) Modbus(R) Master Simulator
                Copyright (c) 2015 epsilonRT, All rights reserved.
                This software is governed by the CeCILL license <http://www.cecill.info>
                
                Protocol configuration: Modbus TCP
                Slave configuration...: address = [0]
                                        start reference = 6, count = 1
                Communication.........: 127.0.0.1, port 502, t/o 1.00 s, poll rate 1000 ms
                Data type.............: 16-bit register, output (holding) register table
                
                -- Polling slave 0...
                [6]:    11
                
                root@residevice:~# mbpoll -m tcp -a 0 127.0.0.1 -0 -1 -r 6
                mbpoll 1.2-6 - FieldTalk(tm) Modbus(R) Master Simulator
                Copyright (c) 2015 epsilonRT, All rights reserved.
                This software is governed by the CeCILL license <http://www.cecill.info>
                
                Protocol configuration: Modbus TCP
                Slave configuration...: address = [0]
                                        start reference = 6, count = 1
                Communication.........: 127.0.0.1, port 502, t/o 1.00 s, poll rate 1000 ms
                Data type.............: 16-bit register, output (holding) register table
                
                -- Polling slave 0...
                [6]:    3
                
                root@residevice:~# mbpoll -m tcp -a 0 127.0.0.1 -0 -1 -r 6
                mbpoll 1.2-6 - FieldTalk(tm) Modbus(R) Master Simulator
                Copyright (c) 2015 epsilonRT, All rights reserved.
                This software is governed by the CeCILL license <http://www.cecill.info>
                
                Protocol configuration: Modbus TCP
                Slave configuration...: address = [0]
                                        start reference = 6, count = 1
                Communication.........: 127.0.0.1, port 502, t/o 1.00 s, poll rate 1000 ms
                Data type.............: 16-bit register, output (holding) register table
                
                -- Polling slave 0...
                [6]:    11
                

                Br,
                Vesa

                Martin Kudláček 1 Reply Last reply Reply Quote 0
                • Martin Kudláček
                  Martin Kudláček administrators @Vesa Kauppinen last edited by

                  @vesa-kauppinen

                  Ok, this is a little bit tricky. The register has 16bits, and some of the bits represent some state or function.

                  Bit 0: Set or read the status of the MWD
                  Bit 1: The MWD rebooted the boarde
                  other bits contain some debug information, which we haven't documented yet

                  So value 11 in decimal is 0000 0000 0000 1011 in binary. The bit no. 0 (first from the right) is 1, which means MWD is enabled. The bit no. 1 (second from the right) is 1, which means MWD already rebooted the board. Other bits don't apply to you.

                  You can "mask" the lowest 2 bits with boolean operation AND, typically with bit mask in hexadecimal representation:

                  register_6 && 0x0003

                  Or with binary mask:

                  register_6 && 0b11

                  I hope this helps you.
                  Martin

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                  • Vesa Kauppinen
                    Vesa Kauppinen @Martin Kudláček last edited by

                    @martin-kudláček

                    Okay. This clarified the case :)

                    Thank you!

                    Br,
                    Vesa

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                    • Vesa Kauppinen
                      Vesa Kauppinen @Martin Kudláček last edited by Vesa Kauppinen

                      @martin-kudláček

                      Hi...again

                      One more stupid question: How do I reset 1-wire bus with mbpoll?

                      I mean, how can i "convert" those commands:

                      ./pollmb.py -p 502 -u 1 -f 5 -a 1001 -q 1 -d 1
                      ./pollmb.py -p 502 -u 1 -f 5 -a 1001 -q 1 -d 0
                      

                      to mbpoll "format". I just don't understand how to read/write coils with mbpoll.

                      Thank you!
                      Vesa

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                      • Martin Kudláček
                        Martin Kudláček administrators @Vesa Kauppinen last edited by

                        Hi @vesa-kauppinen,
                        writing 1 to coil 1001:

                        mbpoll -m tcp -a 0 127.0.0.1 -t 0 -0 -r 1001 1

                        Writing 0:

                        mbpoll -m tcp -a 0 127.0.0.1 -t 0 -0 -r 1001 0

                        You can learn more from the quite detailed help of the mbpoll:

                        mbpoll -h

                        Regards,
                        Martin

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