The present invention provides a process to detect binding events on an electrode microarray. A microarray is provided having addressable electrodes and two or more different types of capture complexes at sites corresponding to the electrodes. The capture complexes capture analytes. Enzymes are attached to form a reporter complex. Substrate solutions are sequentially contacted to make enzyme products that are detectable at the electrodes by a difference in the electrical response at electrodes having the enzyme product and those not having the enzyme product. The enzyme product may be a solid deposition product. The electrical properties of electrodes on the microarray are read for the presence of the enzyme product by sequentially switching each electrode held at a constant voltage to ground and then back to the constant voltage.