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dynamixel_control no motor found /dynamixel mx-64AR, usb2dynamixel

asked 2015-04-01 09:35:04 -0500

Wine gravatar image

updated 2015-04-03 06:15:13 -0500

Hi guys, I am trying to use the new robotis servo: dynamixel MX-64AR, but I cannot find the servo both in win8 and ubuntu 14.04. in win8, I tried to use RoboPlus Wizard to search all the bps, nothing found... in Ros, I run: roslaunch my_dynamixel_tutorial controller_manager.launch, and I got:


 * /dynamixel_manager/namespace: dxl_manager
 * /dynamixel_manager/serial_ports/pan_tilt_port/baud_rate: 57142
 * /dynamixel_manager/serial_ports/pan_tilt_port/max_motor_id: 25
 * /dynamixel_manager/serial_ports/pan_tilt_port/min_motor_id: 0
 * /dynamixel_manager/serial_ports/pan_tilt_port/max_motor_id: 25
 * /dynamixel_manager/serial_ports/pan_tilt_port/update_rate: 20
 * /rosdistro: indigo

 * /rosversion: 1.11.10

    dynamixel_manager (dynamixel_controllers/

auto-starting new master
process[master]: started with pid [23510]

setting /run_id to c01c22cc-d87a-11e4-9915-001aa0aa3777
process[rosout-1]: started with pid [23523]
started core service [/rosout]
process[dynamixel_manager-2]: started with pid [23540]
/opt/ros/indigo/lib/python2.7/dist-packages/dynamixel_driver/ SyntaxWarning: The publisher should be created with an explicit keyword argument 'queue_size'. Please see for more information.
  self.motor_states_pub = rospy.Publisher('motor_states/%s' % self.port_namespace, MotorStateList)
/opt/ros/indigo/lib/python2.7/dist-packages/dynamixel_driver/ SyntaxWarning: The publisher should be created with an explicit keyword argument 'queue_size'. Please see for more information.
  self.diagnostics_pub = rospy.Publisher('/diagnostics', DiagnosticArray)

INFO] [WallTime: 1427898245.997934] pan_tilt_port: Pinging motor IDs 0 through 25...

[FATAL] [WallTime: 1427898248.149759] pan_tilt_port: No motors found.

and I am sure of this :

ls -l /dev/ttyUSB0 

crw-rw-rw- 1 root dialout 188, 0  4月  1 22:51 /dev/ttyUSB0 ....

About the HW, I use usb2dynamixel, RS485 -4p interface, and the switcher is in the middle.

the power support is a takasago ex-375l, I set output as 12.5 v, 0.4A, the motor led flashed when it's powered on.

And I had checked the 4p cable, all the four lines are good.

About the ros version;

rosversion dynamixel_controllers


$ dpkg -p ros-indigo-dynamixel-controllers | grep Ver

Version: 0.4.0-0trusty-20150305-1931-+0000

about the bps in the launch file, the parameter of the servo is link:here, the default bps of mx-64ar should be 57142.... I had tried 57142, 57143, 57142.9 and 1000000, no one works.

I am really screwed here....................... HEEEEEEEEEEEEELLLLLLLLLLLPPPPPPP!

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What version of dynamixel package are you using? Add to your original question the following command result for the future refenrence:

$ rosversion dynamixel_controllers
$ dpkg -p ros-indigo-dynamixel-controllers | grep Ver
Version: 0.4.0-0trusty-20150327-0507-+0000
130s gravatar image 130s  ( 2015-04-03 04:50:24 -0500 )edit

2 Answers

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answered 2015-04-03 03:49:16 -0500

Wine gravatar image

Hi guys, finally, I went to the Robotis Shop, and they test my motor and a new mx-64ar and an AX series motor, however, only the AX motor can work. So it seems like that this batch of mx-64ar productions have a lot defectives. What's a bad luck, a defective pesters me 5 days....................

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one more thing just for reminding the followers, with the new mx-64ar I exchanged from the shop, everything works well, but the default baud of this motor is 57143.....if you want to ping it through "controller_manager.launch". note that 57142 doesn't work here, although it works in RoboPlus.

Wine gravatar image Wine  ( 2015-04-03 06:46:12 -0500 )edit

answered 2015-04-01 14:35:56 -0500

Sietse gravatar image

updated 2015-04-01 14:37:13 -0500

Are you aware that a counterfeit ftdi chip is being used in the usb2dynamixel? Maybe you are struck by this problem. See for the description and the solution. Worked for me, Sietse

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Thanks for your reply, but I am using mx-64ar, which works with RS485, so I am using RS485 port of USB2dynamixel, not rs232.... which motor are you using ?

Wine gravatar image Wine  ( 2015-04-01 21:17:19 -0500 )edit

and also, I tried lsusb, mine is 0403:6001, so it should be something else........

Wine gravatar image Wine  ( 2015-04-01 21:58:11 -0500 )edit

I'm using an arm from crustcrawler with ax18a's. Good luck with finding the problem.

Sietse gravatar image Sietse  ( 2015-04-02 02:13:33 -0500 )edit

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Asked: 2015-04-01 09:35:04 -0500

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Last updated: Apr 03 '15