Script - Application - Filtering Ean and Code 128 Codes With Handheld

Distinguishing between UPC and EAN barcodes can be challenging. Typically, a UPC code contains 12 digits, often prefixed with a leading zero when formatted as a 13-digit string. In contrast, EAN codes are either 13 or 8 digits long. For the purpose of this example, we will be working exclusively with 13-digit EAN codes.

To ensure accuracy during scanning, the scripts will include a built-in 2-second delay after each successful read. This delay helps prevent accidental or repeated scans of the same barcode.

Data Formatting Script

'use strict';
// Constants
const VALID_CODE_LENGTH = 13;
const ENTER= "\x0D\x0A";
const WAIT_TIME = 2;
//Precofing
dmccSet('SYMBOL.C128','ON');
dmccSet('SYMBOL.UPC-EAN','ON');
dmccSet('UPC-EAN.UPC-A','OFF');
dmccSet('UPC-EAN.UPC-B','OFF');
dmccSet('UPC-EAN.UPCE1','OFF');
dmccSet('UPC-EAN.EAN8','OFF');
dmccSet('UPC-EAN.DELZERO','ON');

// Function to handle the result of barcode decoding
function onResult(decodeResults, readerProperties, output) {
 let outputString = '';
 if (decodeResults[0].decoded) {
   // Check if the decoded content length is exactly 13 characters
   if ((decodeResults[0].content.length === VALID_CODE_LENGTH) || (decodeResults[0].symbology.name == 'Code 128')) {
     outputString = decodeResults[0].content + ENTER;
     output.events.system = Event.system.goodRead; // Trigger good read event
   } else {
     output.events.system = Event.system.noRead; // Trigger no read event
     outputString = ''; // Clear output string
   }
   dmccSet('SYMBOL.C128','OFF');
   dmccSet('SYMBOL.UPC-EAN','OFF');
   if (serialHandler !== null) { //Check if serial handler is enabled
     serialHandler.setTimer(WAIT_TIME); //Lunch timer with defined time value
   }
 }
 output.content = outputString;// Set the output content
}

Communication Script

'use strict';

const LOG = true; //Enable loggin. Results could be found in Device Log

let serialHandler = null; //Declaring serial (COM) handler
function CommHandler(localName) {
 return {
   onConnect: function (peerName) {

     if (peerName === 'COM USB') { //Opening connection on COM USB
       serialHandler = this; // Enableing serial handler
       logMsg('Serial Handler Connected!'); //Logging message that connection have been established
       return true;
     }
     return false;
   },
   onDisconnect: function () {
     if (this === serialHandler) {
       serialHandler = null; //Disableing serial handler
       logMsg('Serial Handler Disconnected!'); //Logging message that connection have been clossed
     }
   },
   onExpectedData: function () {},
   onUnexpectedData: function () {},
   onTimer: function () { //When timer counts to desired value send data
     if (this === serialHandler) { //Check if connection is open
       logMsg ('Timer reached!');
       dmccSet('SYMBOL.C128','ON');
       dmccSet('SYMBOL.UPC-EAN','ON');
       dmccSet('UPC-EAN.UPC-A','OFF');
       dmccSet('UPC-EAN.UPC-B','OFF');
       dmccSet('UPC-EAN.EAN8','OFF');
       dmccSet('UPC-EAN.DELZERO','ON');
     }
   }
 };
}

function logMsg (msg) { //Function for loggin messages
 if (LOG) {
   console.log(msg);
 }
}