System for controlling communication between a main control assembly and programmable terminal units
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United States of America Patent
Stats
-
Jan 27, 1987
Issued Date -
N/A
app pub date -
Sep 17, 1984
filing date -
Feb 19, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
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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