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    Chinese brand PSU_monitoring rs485 and Mango

    How-To
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    • phildunlapP
      phildunlap
      last edited by phildunlap

      Also something is clearly wrong about my understanding of that, since the data length of sending a 3032 is two bytes (0b00110000 0b00110010) but it's clearly stated to be one byte for the version number. Then, why is 02 on the lower row? This is why i don't get over involved in every protocol that comes by... they aren't always easy to make sense of. So is it sending the 7F [LOWER ROW] 0D? Then what is the point of the top row?

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      • H
        hengst
        last edited by

        I tracked down the software engineer of the device ( how about that , gehehe ) he is writing a excel sheet for frame calculation Monday.

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        • H
          hengst
          last edited by

          playing and gambling, ( couldn't wait till Monday ) i found the command :

          7e 30 32 30 30 30 31 34 32 30 30 30 30 30 32 30
          30 30 31 36 43 0d

          ( request node ID command )

          will result in :

          ~02000142040000AD or

          7e 30 32 30 30 30 31 34 32 30 34 30 30 30 30 41 44

          I found this with the tool : https://sourceforge.net/projects/scriptcommunicator/
          as i almost work all the time with Linux, this was a golden tool to play around with the commands.

          i used these settings for the usb-rs485 communication :

          0_1477734194513_upload-8ce15371-5806-4a16-9939-b21806928882

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          • H
            hengst
            last edited by

            "
            While implementing this will teach you a lot about Mango and this device, I can't help but wonder if it'll save you time and money to use a device that has a standard protocol? "

            I know,
            i ordered it with the idea to use it as with a build in SNMP agent ( as most network devices have these days ) but i didn't look good at the specs, as a result i cant add it to my ( LibreNMS ) monitoring, because its a "dumb" device.

            The device is sold as width TCP/IP connection option and default rs485. ( i bought width both )
            as i also added a Kwh meter to the setup, ( see topic SDM120-ModBus ) which is also rs485(ModBus) i needed another monitoring tool. and it looks like Mango is filling the gap here, as it does SNMP and rs485(modbus) etc..

            As its a VERY cool thing to build and learn, and by posting the results ( in the end as a HOW TO summary ) i am contributing my part to the community's , i am convinced it will help others.

            When i got it running it also benefits "Mango" , as then we are going to use it at customers for monitoring anything the want.
            Anyway i love it already very much.

            so, back to lab.

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            • H
              hengst
              last edited by

              alright. i got everything complete.

              at the point i had figured out how the frame structure functioned, i got some explanation from the other side of the world.

              it was in Chinese language, but i have translated it with big brother google.

              0_1477746072797_io-codes-recti_translated.pdf

              So i think its time to get something done in Mango,

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              • phildunlapP
                phildunlap
                last edited by phildunlap

                Nice! You should be able to test the examples in that document by simply setting 'COMMAND' to the hex (without the spaces, I would think) and checking the RESPONSE point. Then you can experiment with either parsing the values out through regex serial points or implementing the extractMessageInformation function in the point link. You can still use regex in the script, doing the regular JavaScript syntax:

                var messageData = /7E(.*)0D/.exec(RESPONSE.value); //source.value in the actual point link script
                var messageBody = messageData[1];
                
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                • H
                  hengst
                  last edited by

                  Jup, that works :

                  0_1477748487474_upload-8158d6a8-465a-4c8c-9254-380c6c316944

                  "
                  implementing the extractMessageInformation function in the point link. You can still use regex in the script, doing the regular JavaScript syntax:

                  that is new for me.. but banging my head on the desk and grabbing a cold beer and we are good to go another few hours gehehe.

                  Thanks for the pointers Phil.

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                  • phildunlapP
                    phildunlap
                    last edited by

                    Nice! That looks like the ASCII (since it doesn't begin with HEX) payload perhaps? Maybe it would be better to just do the regex parsing on the Serial Data source points, then, if you don't have to do any of the conversion to or from hex.

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                    • H
                      hengst
                      last edited by hengst

                      I had a little throwback....

                      after i did get this response i was lost in how everything worked in Mango,
                      so i thought it would be good to start over from scratch.

                      also i changed the source from "serial data source" to " tcp/ip" data source ( as that is what i need to use in the end )
                      ( the PSU happens to have both options to get the information )

                      that shouldn't make a big difference in the working flow of mango i think.

                      i tested the commands over tcp/ip with SerialComm program to confirm and it works just like Serial.

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                      • phildunlapP
                        phildunlap
                        last edited by phildunlap

                        "Shouldn't make a big difference..."

                        I wouldn't think so either. Do you still have the same setting for sending hex? You can always test the TCP/IP data source against netcat, to see what's coming out of it. Simply nc -l 9876 and point the TCP/IP data source at that machine's 9876 port.

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                        • H
                          hengst
                          last edited by

                          9876 would than be the port i use i guess ? ( which is 9999 in my case )

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                          • H
                            hengst
                            last edited by

                            This post is deleted!
                            1 Reply Last reply Reply Quote 0
                            • H
                              hengst
                              last edited by

                              I used tcpdump , and looks like there is interaction,

                              0_1477930282597_upload-66409ea6-ec39-4a22-be72-c7c7674ac23e

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                              • H
                                hengst
                                last edited by

                                Yes , data is incoming.

                                0_1477932713242_upload-9ffbf133-70e8-4e32-b554-235cb0fa7be4

                                now whats next ?

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                                • H
                                  hengst
                                  last edited by hengst

                                  i know i have to get the values out of the returned Hex, with some ( java? ) code
                                  ( in the script like in the second post probably ).

                                  how does such code typical looks like.

                                  get states of modules :

                                  returned code :
                                  7e30323030303134323030303032373432353641334437424543434343434430303030303030303345393939393941303030303030303034314338303030303431433830303030303134314338303030303030303030303031 3030303145350d

                                  following manuals :

                                  7e3032303030313432303030303237 ( length of data )
                                  3432353641334437 Bus voltage-float: D7A35642=53.66
                                  4245434343434344 Battery 1 voltage
                                  3030303030303030 Battery 2 voltage
                                  3345393939393941 Load current
                                  3030303030303030 Total module current
                                  3431433830303030 Battery temperature-float: 0000c841=25
                                  3431 Number of modules:
                                  4338303030303031 Environment humidity
                                  3431 System alarms
                                  4338303030303030 Batteries and environmental alarms
                                  3030 Reservation
                                  3031 State of charge: 1 float charging
                                  30 30 Relay alarm high byte
                                  30 31 Relay alarm low byte
                                  45 35 0D

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                                  • phildunlapP
                                    phildunlap
                                    last edited by phildunlap

                                    You could get the hex for any of these by doing something like...

                                    var busVoltage = /[0-9A-Fa-f]{46}([0-9A-Fa-f]{8}).*/.exec(messsage);
                                    var extractedValue = busVoltage[1];
                                    

                                    Using the position in the message to know where to extract them (so, after 46 characters, capture the next 8 is what that regular expression suggests). I'm not sure what the float encoding is (how does D7A35642=53.66?), so I can't really offer too much help there. Some people are talking about a hex to float function here: http://stackoverflow.com/questions/5055723/converting-hexadecimal-to-float-in-javascript

                                    It looks like you're working with the ASCII encoded values again, so while you're playing with the script check out the output of

                                    function toASCII(message) {
                                      var result = "";
                                      while(message.length > 1) { //parse two characters at a time
                                         var charCode = message.substr(0, 2);
                                         result += String.fromCharCode( "0x" + charCode );
                                         message = message.substr(2); 
                                      }
                                      return result;
                                    }
                                    print( toASCII(message) );
                                    

                                    In case that's useful.

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                                    • H
                                      hengst
                                      last edited by

                                      yes, that float things is special, i figured out is has something do do with "reversed"

                                      http://www.scadacore.com/field-applications/programming-calculators/online-hex-converter/

                                      0_1477943857945_upload-c4d36cfd-0296-4615-a6f7-003b8e3aeca9

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                                      • H
                                        hengst
                                        last edited by

                                        pffff, drives me crazy. putting pieces of code in the script only complains about no variable set and stuff and i don t know in what order and place to put the code.
                                        so,
                                        now i started again from scratch. but same settings do not get any data anymore.
                                        ( i see it coming in tcpdump )

                                        only in terminal i see :

                                        0_1477950904238_upload-a6654fa3-ebf8-4b5f-bc3d-4eccf1b5b37b

                                        removing everything. start from beginning. same result. this happened me twice now.

                                        rebooting..

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                                        • phildunlapP
                                          phildunlap
                                          last edited by

                                          Perhaps the device holds open the connection and your timeout is set to 0? I would give it a try with a 1000ms timeout or so.

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                                          • H
                                            hengst
                                            last edited by

                                            Nope, reboot did not help, rebooting device and connections did not help.

                                            settings :

                                            0_1477951949659_upload-8a4e25f9-e204-4559-9642-7b9b6c0784e3

                                            0_1477952027989_upload-9a895995-1c71-4f83-831c-8f67c82813f5

                                            1 Reply Last reply Reply Quote 0
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