Communication system for control applications

Details Communication system for control applications Communication system for control applications

1993-11-15

1998-01-20

Chin, Wellington

Multiplex communications

Wide area network

Packet switching

370 851, 370 852, 370 859, H04L 1240, H04G 902

Patent

active

057107556

ABSTRACT:
The communication system is a cyclic, serial, multi-drop, master-slave, half-duplex protocol having data formatted into receive frames and transmit frames carried on separate wires. Both receive frame and transmit frame have the same structure and are synchronized with each other. Each frame comprises a flag byte followed by 8 device channels, each channel comprising 3 bytes space. The flag byte is used as a reference for frame synchronization. Physical connection is by way of two half duplex RS-485 multipoint links utilizing telephone cable for connection between devices.

REFERENCES:
patent: 4811338 (1989-03-01), Haruyama et al.
patent: 4858222 (1989-08-01), Weimert
patent: 4949359 (1990-08-01), Voillat
patent: 4955018 (1990-09-01), Twitty et al.
patent: 5012468 (1991-04-01), Siegel et al.
patent: 5090013 (1992-02-01), Fadem

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