Capture weight of a Mettler Toledo truck Scale using serialport

I got a code online to read via rs232 using serial port ,the code uses readExisting() to get the data(im geting data form a MettlerToledo scale connected at com3,9600,8,N,1)problem no开发者_如何学编程w is that i change it to ReadLine() but it captures the weight once and i need the weight updated all the time! Any ideas?

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You could use a loop of some form

While someBoolean
   'Read the serial port
End While

I would suggest putting this on a BackGroundWorker as to not interrupt the main thread

Or you could use a Timer

Dim weightTimer As Timer = new Timer(100) 'pick either the threading or the Forms timer depending

    'Using the Forms timer for the example
    'Handle the timer tick event
    Private Sub weightTimer_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles weightTimer.Tick
       'Read the Serial Port
    End Sub