def get_chart_parameters(prefix='', rconn=None):
    """Return view, flip and rotate values of the control chart"""
    if rconn is None:
        return (100.0, False, 0.0)
    try:
        view = rconn.get(prefix+'view').decode('utf-8')
        flip = rconn.get(prefix+'flip').decode('utf-8')
        rot = rconn.get(prefix+'rot').decode('utf-8')
    except:
        return (100.0, False, 0.0)
    return float(view), bool(flip), float(rot)