Multiplex communications – Channel assignment techniques – Polling
Patent
1995-05-09
1998-02-24
Olms, Douglas W.
Multiplex communications
Channel assignment techniques
Polling
370475, 364514R, 34082508, H04J 302, H04L 12403
Patent
active
057217378
ABSTRACT:
A serial transmission system for controlling a network of input/output devices is provided. The serial transmission system includes: a three wire serial link; a master unit for controlling communication over the serial link; multiple input remote units for receiving information from the input devices; and multiple output remote units for controlling the output devices. The master unit includes a programmable optically isolated microcontroller adapted to initiate a synchronous data link control (SDLC) communications protocol with the remote units. In addition the master unit includes memory tables for storing input/output, error, diagnostic, status and node availability information. This information can be shared with a PC or host controller. In addition, the PC or host controller can include programs for directing the master unit and remote units to initialize, reset, scan, or maintain an idle condition.
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Information technology--Telecommunications and information exchange between systems--High-level data link control (HLDC) procedures--Classes of procedures, Reference number ISO/IEC 7809:1991.
Synchronous Data Link Control, IBM, Jun. 1986.
Nagata Mary
Radjabi Bahman
Shoji Sergio
Hahn, Esq. Peter K.
Jung Min
Olms Douglas W.
SMC Pneumatics, Inc.
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