The FDR plug-in option card is for use in conjunction with the LiftMaster ® Logic 3-equipped operator. It facilitates field connections between the LM21AFCB and the operator by reducing the standard 10-wire interconnection to a basic 4-wire phone cord. Both the FDRCARD and the AFCB are equipped with an RJ-11 phone jack as standard to accept the phone cord. The FDRCARD also eliminates the need for ordering the operator with auxiliary open and close limits, which are required for all non-Logic 3 operators.
