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Hello,
If still an issue (almost 3 years now!), following are the steps:
$ roscd dynamixel_motor && cd ../dynamixel_driver/scripts
This command is just to navigate to the relevant ROS package.
$ python change_id.py --port=[your_port_connection] old_id new_id
This script changes the ID value of the motor.
By default, all new motors are shipped with ID = 1.
USAGE: If your motor was connected to port '/dev/ttyACM0', and you wish to change the ID from default(1) to 2, then execute the following script:
$ roscd dynamixel_motor && cd ../dynamixel_driver/scripts
$ python change_id.py --port=/dev/ttyACM0 1 2
You can connect your dynamixel to a PC, check the port it is connected to by running:
$ lsusb
Additionally, a 12V power supply is recommended on ROBOTIS' website.
Best,
R