Futaba 10J F4109 Data Sheet

*There are a function which can be used according to the kind of servo, and an impossible function. 

Displays the ID of the servo whose parameters are to be read. It cannot be changed.

Channel of the S.BUS system assigned to the servo. Always assign a channel before use.

The direction in which the servo rotates can be changed.

When "Retractable" is selected and the servo has been continuously stopped for 30 seconds, the dead 

band expands and unnecessary hold current due to external force is eliminated. When a new control 

signal enters, normal operation is resumed. When using the servo as a landing gear servo, select 

"Retractable". Also adjust the servo travel to match the landing gear movement range.

Restricts operation in the specified direction the instant the power is turned on. By using this setting, the 

first initial movement when the power is turned on slowly moves the servo to the specified position.

The state of the servo when the servo input signal is lost can be specified. The "Hold" mode setting holds 

the servo in its last commanded position even if using AM or FM system.

This function changes smoothness of the servo operation relative to stick movement changes. Smooth 

setting is used for normal flight. Select the "OFF" mode when quick operation is necessary such as 3D.

The neutral position can be changed. When the neutral offset is large value, the servo's range of travel is 

restricted on one side.

Speeds can be matched by specifying the operating speed. The speed of multiple servos can be matched 

without being affected by motor fluctuations. This is effective for load torques below the maximum 

torque.
However, note that the maximum speed will not be exceed what the servo is capable of even if the 

servos operating voltage is increased. 

The dead band angle at stopping can be specified.
[Relationship between dead band set value and servo operation]
Small → Dead band angle is small and the servo is immediately operated by a small signal change.
Large → Dead band angle is large and the servo does not operate at small signal changes.
(Note) If the dead band angle is too small, the servo will operate continuously and the current 

consumption will increase and the life of the servo will be shortened.

The left and right travels centered about the neutral position can be set independently.

The minimum current applied to the internal motor when starting the servo can be set. Since a small 

travel does not start the motor, it essentially feels like the dead band was expanded. The motor can be 

immediately started by adjusting the minimum current which can start the motor.
[Relationship between boost set value and servo operation]
Small → Motor reacts to a minute current and operation becomes smooth.
Large → Initial response improves and output torque increases. However, if the torque is too large, 

operation will become rough.