System for controlling communication between a main control asse

Details System for controlling communication between a main control asse System for controlling communication between a main control asse

1984-09-17

1987-01-27

Shaw, Gareth D.

Boots, shoes, and leggings

235379, 371 62, G06F 1516, G06F 1106

Patent

active

046398899

ABSTRACT:
A data communication system comprises a plurality of terminal units having different addresses individually and a main control assembly connected to the terminal units by transmission lines for controlling the terminal units. The terminal units include a first group of terminal units and second group of terminal units. The main control assembly controls the first group of terminal units according to a series of instructions for controlling the units in a predetermined sequence. When executing one instruction, the main control assembly performs data communication with only the one specific terminal unit relevant to the instruction. Concomitantly with the communication with the specific terminal unit, the main control assembly scans and communicates with the second group of terminal units only during periods that specified conditions exist. In addition, means are provided for communicating malfunction information between the main control assembly and the terminal units.

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Computer Dictionary and Handbook, Sippl et al, 1980, pp. 51-52 and 597-598.

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