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Native Command Reference MF Motor OFF Shuts off the motor current. On DC motor versions this command turns the servo loop off; the motor no longer holds its position actively and may be moved freely. The MF command is used to prevent unwanted movement (servo dither) or to allow for manual positioning of the unit. The motor position is still monitored in the MF status and may be queried (e.g. by the TP command). Be careful when using this command on stepper motor versions because the controller may lose track of the motor position. Examples: Sets motor servo-control to OFF MFCR See also : MN (Motor ON) Servo control can be enabled again anytime by MN. MN Motor ON Sets the motor current back to the hold value. On DC motor versions, automatically sets the target to the current position and reenables servo control, so jerk-free activation of the servo loop is possible. Note: stepper motor versions may have lost track of the position if they were in the MF state. Examples: MN Sets motor servo-control to ON See also : MF (Motor OFF) MRn Move Relative Initiates a move of relative distance of n counts/steps from the current target position. n may be either a positive or negative number, and is added algebraically to the current target to obtain the new target. The resulting absolute target position must be between + and -1,073,741,823. Motion is counted in encoder counts (DC motor versions) or (micro)steps (stepper versions). Examples: www.pi.ws Native Commands MS176E Release 1.0.1 Page 31