Hi,

I experienced connexion issue when using ROS package dynamixelcontollers to manage dynamixel motor with usb2ax adaptator. The modification in file dynamixelio.py solved this issue:

class DynamixelIO(object): """ Provides low level IO with the Dynamixel servos through pyserial. Has the ability to write instruction packets, request and read register value packets, send and receive a response to a ping packet, and send a SYNC WRITE multi-servo instruction packet. """

def __init__(self, port, baudrate):
    """ Constructor takes serial port and baudrate as arguments. """
    try:
        self.serial_mutex = Lock()
        self.ser = None
    """ 
        self.ser = serial.Serial(port)
    self.ser.setTimeout(0.015)
        self.ser.baudrate = baudrate
        self.port_name = port
    """
    #To add
    self.ser = serial.Serial(port,baudrate,timeout=0.04)

Regards,

J.Favrichon