Abstract: A communication circuit for an electronic dimming ballast provides high-voltage miswire protection and improved rise and fall times of a transmitted digital signal. The electronic dimming ballast comprises a control circuit, which is coupled to a digital communication link, for example, a DALI communication link, via the communication circuit. The communication circuit comprises a receiving circuit for detecting when the digital ballast communication link is shorted and for providing a received digital message to the control circuit. The communication circuit also comprises a transmitting circuit for shorting the communication link in response to the control circuit. The communication circuit also includes a high-voltage fault protection circuit for protecting the circuitry of the communication circuit if the communication circuit high-voltage mains voltages. The communication circuit is operable to reliably transmit digital messages having improved rise and fall times.

Abstract: A method of controlling a motorized window treatment provides for continued operation of the motorized window treatment during an overload condition, a low-line condition, or an electrostatic discharge (ESD) event. The motorized window treatment is driven by an electronic drive unit having a motor, a motor drive circuit, a rotational position sensor, a controller, and a memory for storing the command. The controller stores the present position of the motorized window treatment in the memory each time the rotational position of the motor changes by a predetermined angle, such that a plurality of positions are stored in the memory. When the controller is reset due to an overload condition or ESD event, the controller recalls the desired position from the memory, determines the present position, and continues to drive the motor drive circuit in response to the command and the present position.

Abstract: A drapery system for moving a suspended drapery fabric allows the drapery fabric to be decoupled from a drive system, such that the drapery fabric may be manually moved. The drapery system comprises a master car comprising a driven portion and a non-driven portion. The driven portion is coupled to a drive belt of the drive system, while the non-driven portion is coupled to the drapery fabric. The master car comprises a spring having a snap adapted to be received in a snap-receiving structure, such that the driven portion is coupled to the non-driven portion. The non-driven portion is operable to move in response to movement of the drive belt to move the drapery fabric when the non-driven portion is coupled to the driven portion. The non-driven portion is operable to be decoupled from the driven portion, such that the position of the drapery fabric may be manually adjusted.