Data communication system having bidirectional station interface

Details Data communication system having bidirectional station interface Data communication system having bidirectional station interface

1975-10-14

1978-12-19

Chapnick, Melvin B.

Boots, shoes, and leggings

G06F 304, G06F 504

Patent

active

041308832

ABSTRACT:
Digital data, in the form of serial station bit frames which exclude protocol information, are communicated bidirectionally over a plurality of serial transmission channels to peripheral devices in a digital process control system. Data enters and leaves a process control computer input-output section serially in response to software-generated control signals. Serial-to-parallel station interfaces are located along each channel. Each interface has a multifunctional shift register responding to the control signals to provide not only bidirectional data flow through each station, but simultaneous parallel loading of each peripheral device. One software control logic arrangement eliminates modems and portions of hardwired data flow control logic elements in each station interface, yet operates with a station bit frame which excludes protocol information. Also provided are true interrupt capability at each interface; verification of every bit of input and/or output of each station interface; diagnostics.

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Andreiev, N.; "The Search For the Standard Control Signal Bus" in Control Engineering, Mar. 1975; pp. 43-46.

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