Discussion in 'International Area' started by cweeks, Jan 13, 2008.

  1. cweeks

    cweeks New Member

    Can anyone better describe the Simprop Lipo-control data format to me. I get the following in hex at 9600 baud every second:

    0A F5 0C 45 33 30 46 44 45 30 46 45 33 30 46 45 38 30 33 35 38 0D

    I understand this to be:

    1 byte 4bytes 4bytes 4bytes 4bytes 4bytes 1byte
    Start Overall voltage %Balanced V Cell1 V Cell2 V Cell3 End

    I particular can anyone tell me what format the 4bytes take, are they floating point, fixed point, etc... ?

    And how you tell this to logview, is it in the Simprop Lipo-Control.ini file ? as I cant spot it in there.

    The reason for asking is I wish to use the balancer in a project of my own and I also would like to use logview with another project. So a better understanding how to configure it would help.

    Apologies for the English.

    Thanks, Cam.
  2. Dominik

    Dominik Administrator Staff Member

    Hi Cam,

    well the values are send in HEX.
    1007 = 4103
    You have to devide it by 1000 and you will get the voltage.

    You are wrong !!

    Byte 1-3 are starting bytes
    Byte 4 is the actual state of the balancer
    Byte 5 is the number of cells
    Byte 6..x are the voltages (everyone has 4 bytes as described above ...)

    last bytes ...
    xx yy zz
    xx yy -> checksum
    zz -> end sign <cr>

    The balanced value is calculated within the software (e.g. LogView).
  3. cweeks

    cweeks New Member

    Thank you for the quick reply but I still don't understand fully :(

    In my example:

    0A F5 0C 45 33 30 46 44 45 30 46 45 33 30 46 45 38 30 33 35 38 0D

    We have start bytes = 0A F5 0C
    Balancer state = 45
    Number of cell = 33 = 3 in Ascii
    Cell number 1 voltage = 30 46 44 45
    Cell number 2 voltage = 30 46 45 33
    Cell number 3 voltage = 30 46 45 38
    Not sure (you described them as xx yy zz) = 30 33 35
    Checksum = 38
    End = 0D

    I still don't understand how I go from 30 46 45 33 to 4.067v
    or from 30 46 45 38 to 4.072v, can you help ?

    Also what is the purpose of the bytes xx yy zz ?

    Thanks Cam.
  4. Dominik

    Dominik Administrator Staff Member

    Hi Cam ...

    Well I can´t offer you the complete informations ... I´m sorry.
    But did you ever think about translating the HEX values into two times ... ;)

    Example: Cell number 1 voltage = 30 46 44 45
    30 hex = "0" ASCII
    46 hex = "F" ASCII
    44 hex = "D" ASCII
    45 hex = "E" ASCII

    So 30 46 44 45 equals "0FDE". Now get the decimal value from 0FDE. This is 4062. Devided by 1000 .... :eek:

    Two steps ...
    1) Translate from Hexvalues to ASCII values (use http://www.torsten-horn.de/techdocs/ascii.htm for example ...)
    2) Translate ASCII Result from Hex to decimal.

    0A F5 0C = Start
    45 = State ...
    33 = Cell numbers ... Kepp in mind the conversation from above ;)
    30 46 44 45 = Cell 1
    30 46 45 33 = Cell 2
    30 46 45 38 = Cell 3
    30 33 No idea ... unimportant
    35 38 = Checksum
    0D = Endsign

    Hope that helps ...
  5. cweeks

    cweeks New Member

    Got it, thanks for taking the time to explain it. As you guessed I was missing the 0FDE to 4062 step.

    Can I ask is this decoding information hardcoded into logview ? and how did you guys figure out the various formats for all the devices logview supports. Did you contact manufactures or did you do it the hard way ?

    Cam.
  6. Dominik

    Dominik Administrator Staff Member

    Hi !

    Yes. This is hard coded.

    In most cases we get the information from the manufactures. And if we don´t get it ... Well Holger and me have a lot of experience sniffing und decoding serial Ports ... :cool:
  7. cweeks

    cweeks New Member

    Ok, I am also making a model motor dynamometer and would like to use logview to display the results. Do I have to tell you guys the format so it can be hardcoded in, is this even the sort of thing you would do ? Or is that what "OpenFormat.ini" is for ?

    Apologies for all the questions but it's not easy when you don't speak German.

    Cam.
  8. Dominik

    Dominik Administrator Staff Member

    Hi Cam,

    do you have skype or is it possible that you install skype?
    Then I can help much faster and I think the first question about the balancer is answered ;)

    My skype user is schmidom.

Share This Page