Abstract: A data acquisition system is used in an industrial environment in connection with the conveying of work pieces or the like usually through a number of processed steps such as in connection with a programmable conveying system which may be used in the field of electroplating, heat treating or an immersion coating. With the technique of this invention positive data feedback from the product member (work piece) is obtainable for the purpose of, for example, identity of work parts, choice selection, or critical parameter control. The technique utilizes two separate channels including a sync channel and a data channel for providing target information which is read serially as the work is hoisted by a two-channel photo electric receiver/transmitter preferably mounted to a stationary member of the hoist frame or leg. The data and synchronizing channel signals are used combinatorily to provide a system that is immune to the rate differential of carriers or stop-restart operation.

Abstract: A control scheme is used in a conveying system which is preferably a programmable conveying system of the station searching type including a wagon with a hoist that is capable of traveling between a number of different stations in the system. One or more of the stations has the control which in the disclosed embodiment is a rectifier setting control associated with a tank at a station. At the time that the piece being conveyed is loaded at a load position, the operator introduces a coded card or the like carried by the hoist, which card may be subsequently read by a reader with the data on the card representative of a particular rectifier setting. This data in a binary form is conveyed by a multiple bit data bus to a digital to analog converter. If the system includes a plurality of stations to be controlled then the data is coupled to all digital to analog converters.