Each motor on the bus has a unique ID. New motors usually come with a default ID 1 . To ensure normal communication between the motor and the controller, we first need to set a unique ID for each motor. In addition, the data transmission speed on the bus is determined by the baud rate. To be able to communicate with each other, the controller and all motors need to be configured with the same baud rate, and the baud rate of this robotic arm servo is 100000.