Need help connecting Fingerprint Scanner - TTL (GT-511C3) over UART Serial Comms

could you please paste a code that should retrieve a given template let me run, maybe my code was bad and didnt implement it way I should;

GT511CXX.prototype.getUserFingData = function(id, callback){
  let me = this,
    open = () => me.open(1),  
    getData = (id) => me.getTemplate(id),
    close = () => me.close();
  
  return new Promise((resolve, reject) => {
    let errorHandler = (err) => { close(); reject(err);
                    },
            successHandler = (data) => { console.log('template gotten'); console.log(data); close(); resolve();
                    };
    
    getData(id)
      .then(successHandler)
      .catch(errorHandler);
  });
}

I also tried this code below, and got a timeout exceeded

fps.getTemplate(1).then( (data) => { console.log("then called"); console.log(data); } )
  .catch( (err) => console.log(err));