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Script to convert from Hex to Dec

  • Hello, the snmp device send the data in hexadecimal format for example: Battery voltage = 12:7D, I want to solve it with a Metadata Source, but I dont have information how I can create a script.
    Please could You Help me with this script and could you share information about how to create scripts???.
    In advance, thanks so much

    Jorge G

  • Hi Jorge

    you can use parseInt for this:
    return parseInt(p.value, 16)

  • @craigweb said in Script to convert from Hex to Dec:

    return parseInt(p.value, 16)

    Thanks so much Craig, but it didnt work. please let me to explain You:
    the hex data is arriving as 13:32 (it is Hex 1332, so must be in Dec Value=4194)
    With your Script I got the Dec value from just the first number (Hex13 =Dec19)
    this device send a string like 13:30:27:14:01:33:02:6c:02:76.
    then I need to get

    After i get the values, then we will need to scale it:

    I understand how to define a script to multiply, but some data need to be multiply and the final result will be minus 40, for example:
    Data 02:76 = Hex630= ((630*0,1)-40)=23

    As you can see im in a problem, please could you support me

    In advance thanks so much
    Jorge G

  • @jorge-gonzalez said in Script to convert from Hex to Dec:


    @Jorge-Gonzalez, documentation to solve your problems.

    Firstly see what parseInt does -

    There you can see that the hexdecimal value has to be in correct format be it with 0x or without. Your string splits 2 bytes in the hexdecimal format by using a colon. You need to remove it. Simply do it by utilizing .replace method on a string before putting it into parseInt. Or if you have a string which contains multiple values utilize .split method on a string and then put the bytes together before putting the value into parseInt.

    Replace method explanation

    Split method explanation

    Following function is following the detailed explanation you provided in the post.

    function stringsplitter (string) {
    var result = {};
    // This contains the bytes of data
    result.arrayofbytes = string.split(':');
    // Get byte count of data inside the string
    result.bytecount = result.arrayofbytes.length;
    // Start at the beginning
    var variablecounter = 0;
    result.hexdata = [];
    result.decimaldata = [];
    // Loop over the array, but taking into account that we have 2 byte data, use try/catch so that function will return if something should fail
    for (var x = 0;x < result.bytecount / 2;x++){
    result.hexdata[x] = result.arrayofbytes[variablecounter] + result.arrayofbytes[variablecounter+1];
    result.decimaldata[x] = parseInt(result.hexdata[x],16);
    variablecounter += 2;
     return err
    // return object with all our data which includes hexdecimal data, decimaldata and byte count inside the string
    return result;
    // Example usage
    var devicestring = '13:30:27:14:01:33:02:6c:02:76';
    var data = stringsplitter(devicestring);
    //get array in hexdecimal and decimal format
    var hexdata = data.hexdata;
    var decimaldata = data.decimaldata;
    // first value in hexdecimal and decimal format
    var firstvaluehex = hexdata[0];
    var firstvaluedecimal = decimaldata[0];
    // Second value in hexdecimal and decimal format
    var secondvaluehex = hexdata[1];
    var secondvaluedecimal = decimaldata[1];
    // Following that your post had used an example with the last value
    var lastvalue = decimaldata[4];
    // Should be 23
    var lastvaluecorrected = lastvalue * 0.1 - 40;