#fig init
    fig2 = plt.figure()
    bx=fig2.add_subplot(111)
    fig2.canvas.draw()
    x = np.linspace(0,1, num=rows)
    y = np.linspace(0,1, num=cols)
    X,Y = np.meshgrid(x,y)
    h=bx.imshow(X,vmin=0,vmax=255,interpolation="None",cmap='gray')
    while True:
        try:
            # Recibe los datos
            data_out = rx(ext)
            end = timer()
        except:
            exc_type, exc_value, exc_traceback = sys.exc_info()
            print "*** print_tb:"
            traceback.print_tb(exc_traceback, limit=1, file=sys.stdout)
            print "*** print_exception:"
            traceback.print_exception(exc_type, exc_value, exc_traceback,limit=2, file=sys.stdout)
            break
        else:
            print "tiempo =" + str(end - start)
            start = timer()
            if(not data_out.size):
                break
            else:
                #cols check
                tam=TAM
                while True:
                    if(data_out.size>=tam):
                        data_out = data_out[:tam]
                        break
                    else:
                        tam-=rows
                if(DEBUG):
                    print "data:" + str(data_out.size)
                i += 1
                print i
                data_out.shape = (-1, rows)
                print data_out.shape
                #plot
                h.set_data(data_out)
                fig2.canvas.draw()
                fig2.canvas.flush_events()
                plt.pause(0.000000000001)