Abstract: An order filling apparatus includes an elongated belt conveyor having a bin-on switch and a bin-off switch at opposite ends thereof. A plurality of item dispensers are positioned along the conveyor, and each dispenser is loaded with a single type of item. An order filling control computer has a bus cable extending along the conveyor, and each dispenser has a dispenser control board connected to the bus. Each control board includes an address decoder and circuitry for relaying command signals from the controller to the dispenser and for generating status signals indicating the operational status of the dispenser. A conveyor travel encoder provides a position signal indicative of conveyor travel. The controller stores orders to be filled with items. An order filling method includes a conveying item receptacle bins past the dispensers to receive items therefrom. As each bin engages the bin-on switch, an order is activated and associated with the bin.