A servo actuator default disconnected ID setting method is performed by a servo actuator controlling system, which includes a plurality of servo actuators. A first message is broadcasted which indicates that an original ID is replaced with a non-default-disconnected to the plurality of servo actuators. The original ID of each actuator is replaced with the non-default-disconnected according to the first message. A second message is broadcasted which indicates that the non-default-disconnected ID is replaced with a default disconnected ID. And the non-default-disconnected ID of each servo actuator is replaced with the default disconnected ID according to the second message.

A servo actuator ID setting method is performed by a servo actuator controlling system. The servo actuator controlling system includes a master controller and a plurality of servo actuators. One servo actuator is set to disconnect to a next servo actuator. A plurality of interfaces of the master controller are selected to turn on in sequence. The following steps are repeatedly performed to set servo actuator ID: broadcasting a signal to replace an original ID of each of the plurality of servo actuators with a target ID; the plurality of servo actuators in each branch connecting to the master controller; and replacing the original ID of each of the plurality servo actuator with the target ID.

A servo actuator default disconnected ID setting method is performed by a servo actuator controlling system, which includes a plurality of servo actuators. A first message is broadcasted which indicates that an original ID is replaced with a non-default-disconnected to the plurality of servo actuators. The original ID of each actuator is replaced with the non-default-disconnected according to the first message. A second message is broadcasted which indicates that the non-default-disconnected ID is replaced with a default disconnected ID. And the non-default-disconnected ID of each servo actuator is replaced with the default disconnected ID according to the second message.