The Foxboro Company

Richard O Driscoll

David A Richardson

Allan L Flanagan

William E Jordan

Richard L McAllister

A universal module serves as the basis for creating a plurality of different embodiments of electrical display stations. The universal module is adapted to be connected to remotely located process control instrumentation from which it may receive and to which it may transmit analog and digital signals. The different embodiments are created by connecting to the universal module a selected combination of components such as status indicators, switches and signal adjusting devices. The universal module includes a micro-processor system having a central processing unit, a clock circuit and a non-volatile type of program storage unit with an address provided for each different embodiment. An embodiment selector provides the interconnection between the components connected to an embodiment and the circuits of the universal module and activates the address for the embodiment. The micro-processor system provides reference frequency and control signals which control the energization of the electrical display panel to display thereon the amplitude of signals in a selected variety of modes. The micro-processor system also performs all of the other functions prescribed for an embodiment such as controlling analog and digital multiplexing operations, controlling analog to digital and digital to analog conversions, routing of signals to status indicators, performing computations involving signals and the like.

Display station having universal module for interface with different

A deviation meter, responding to a deviation signal, is mounted on a turntable which rotates in response to a set point adjustment. Rotation of the turntable maintains the null position of the deviation meter pointer at a scale position corresponding to a set point value, so that a direct readout of the actual measurement value is provided.

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Mansfield, MA, United States of America

Richard O Driscoll