Chinese brand PSU_monitoring rs485 and Mango

[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

[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.

[hengst]

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/

[hengst]

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 :

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

rebooting..

[phildunlap]

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.

[hengst]

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

settings :

[phildunlap]

Your value index is wrong. It should be 0. and your value regex can just be .*

[hengst]

i removed everything and restarted Mango.

The "value index: set to 1 was indeed the bottleneck. ( i checked to see what difference 0 or 1 made.

so i have data again,

The errors
"
WARN 2016-10-31 23:57:49,316 (com.serotonin.m2m2.rt.dataSource.PollingDataSource$2.execute:228) - PSU-tcp_ip: poll scheduled at 2016/10/31 23:57:49.316 aborted because Task Currently Runnining
"
in terminal are still there do.

i don t care at the moment, as getting things running is more important to me at the moment.

now i start building COMMAND and RESPONSE from the beginning of the forum..

[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.