Chinese brand PSU_monitoring rs485 and Mango

[phildunlap]

I mentioned how to fix that, you would turn your timeout down from 50000 ms to less than your polling interval, so less than 5000.

[hengst]

That fixed it indeed.

i noticed i can check scripting code by clicking on the "little green Script dot".

Its still not clear to me.

• Data source collects makes connection to device. ( interval for set here )
  that is the easy part,

• tcp/ip Data point asks for data ( command data point )

• tcp/ip Data point response listen for data

• tcp/ip Data point "link" this to Scripting data point, "message queue" datapoint.

• in the "link" script screen i put in ?? which pieces of code ?

• in the Script Data source i also put in which pieces ?

i tried a lot of combinations, but i don t see it.

[phildunlap]

Response --> Point Link to parse values --> Scripting Data Source to process message queue into points' values

[hengst]

Alright i got it. thnx.

i had little play with :

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

print (busVoltage[1]);

Script result:
42453939

so that works, i found code for converting the hex to float, but no knowledge of writing (java) coding structure is a show stopper at the moment. but i do have fun learning , gehehe

[phildunlap]

Nice!

All the scripts use JavaScript.

[hengst]

little update ,

i found that i need to convert in javascript the with sort of

function hex2float(num) {
var sign = (num & 0x80000000) ? -1 : 1;
var exponent = ((num >> 23) & 0xff) - 127;
var mantissa = 1 + ((num & 0x7fffff) / 0x7fffff);
return sign * mantissa * Math.pow(2, exponent);
}



window.alert (hex2float("0xA4703942"));
//flipped does the trick
window.alert (hex2float("0x423970A4"));
// outcome 46,36..... ( not rounded )

``

so little progress here.

[hengst]

Perfectum Resultativum ;

[hengst]

now put all this in Mango needs again some pointers i think..

[hengst]

i got this in " point links as script " , is this ok ?

and what to put in :

the script - source script. ?

i tried 1000 different combinations. and reading the wiki / manuals. but sorry, i don't
get it...

[phildunlap]

Looking at your message queue, there are no identifiers. I assume this is because this is always for the same point. You could connect the point link to a point directly representing that value, if there is only one point's value in a message. Otherwise, you'll want some identifiers so that your script can parse the message queue and set points identified by the identifier to the value. I would have the identifiers in an object, where the object looks something like...

{ "identifier1" : p334, .....}

Where p334 is the variable name for the context point of the script.

[hengst]

identifiers, object etc, is probably JavaScript terms....hmm and i was thinking it was almost done, gehehe.
i need a neighbor with programming skills ( the neighbors house is for sale btw )
so back to learning books ..

[phildunlap]

Ha! Well, we'll see how the politics here go ;)

Identifier is just a name that you can use in both places. Object is a JavaScript term for things defined as { "key": value }. Other names are Map and Dictionary.

[hengst]

ok learned "Object"

Can someone point me some explanation links about :

var identifierMap = { "messageIdentifier" : contextPoint1 ....  } 

cant find much on " indentifierMap " on internet somehow.

[phildunlap]

That's just a variable name, so that later in the script you can type

var ident = "messageIdentifier";
identifierMap[ ident ].set( /*your value here*/ );

Where context points are added to the script through the UI of the Scripting data source.

[hengst]

"messageIdentiefier" is the variable/object coming from point link script right ?

[phildunlap]

Yeah. It looks like right now you're setting message queue to something like

49.73;49.73;49.73;

The identifier would be useful if you have multiple values to get out of a message. You explicitly know their positions when you extract the values, so you can give them something you can identify them with. So instead your message queue may look like,

busVoltage-49.73;busVoltage-49.73;busVoltage-49.73;otherValue-106.2;yetAnotherValue-78.1;

such that you could identify where to set those values out to in the script.

[hengst]

this is what i got,

and point link details :

[phildunlap]

I would then modify the

return target.value + result + ";" ;

to

return target.value + "busvolt-" + result + ";" ;

But I think you will want to support multiple data extractions from the same message, like,

return target.value + "busvolt-" + result + ";otherMeasuredValue-" + result2 ;

Also, you may have to have call parseFloat, like so:

identifierMap[ messageInfo[0] ].set( parseFloat( messageInfo[1] ));

[hengst]

Well, looks something is working :

i ques this is normal ?

[hengst]

Alright. made some changes as, reading where not what the should be. now i get the right results from reading the Hex.

Script "message Queue"

// get Hex from source

var busVoltage = /[0-9A-Fa-f]{30}([0-9A-Fa-f]{16}).*/.exec(source.value); 
var extractedValue = busVoltage[1];

var PsuLoad = /[0-9A-Fa-f]{78}([0-9A-Fa-f]{16}).*/.exec(source.value); 
var extractedValue = PsuLoad[1];

// Alarm relays Bit ( 1 is Alarm )
var Alarm = /[0-9A-Fa-f]{185}([0-9A-Fa-f]{1}).*/.exec(source.value); 
var extractedValue = Alarm[1];

// door alarm Bit (1 is Door open )
var DoorAlarm = /[0-9A-Fa-f]{185}([0-9A-Fa-f]{1}).*/.exec(source.value); 
var extractedValue = DoorAlarm[1];


var message = busVoltage[1];

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;
}

// swap bytes /hex

function swap32(val) {
return ((val & 0xFF) << 24)
       | ((val & 0xFF00) << 8)
       | ((val >> 8) & 0xFF00)
       | ((val >> 24) & 0xFF);
}

//print (message);


function hex2float(num) {
    var sign = (num & 0x80000000) ? -1 : 1;
    var exponent = ((num >> 23) & 0xff) - 127;
    var mantissa = 1 + ((num & 0x7fffff) / 0x7fffff);
    return sign * mantissa * Math.pow(2, exponent);
}


function roundToTwo(num) {    
    return +(Math.round(num + "e+2")  + "e-2");
}


// covert Hex to String
var subresult = (toASCII(message));
// create human readabe number
var result = (roundToTwo(hex2float("0x" +subresult)));

// send payload
return target.value + "MainAlarm-" + Alarm[1] + ";" + "Door-" + DoorAlarm[1] + ";" + "busvolt-" + result + ";" ;

at this point i get as result : MainAlarm-0;Door-0;busvolt-53.68;

thats correct.

so i have right input , further i am still completely lost in how i should proceed.

i added my other (modbus) device and thats straight forward , enter the source and add data points to it. thats easy.
now why cant i see the logic for the other source..