Method of data communications in a heterogenous environment

Details Method of data communications in a heterogenous environment Method of data communications in a heterogenous environment

1975-05-29

1977-02-08

Yusko, Donald J.

Communications: electrical

Digital comparator systems

179 15AL, 3401725, H04J 308, G06F 506, H04Q 900

Patent

active

040074412

ABSTRACT:
A method of data communications for use in systems employing serial transmission techniques in a ring or loop configuration. Access to the communication network is via a communications processor and a interface unit termed a node. The communications processor is responsible for network protocol and activities as well as for interfacing devices to the network. The node provides the only connection to the loop and drives the clock for the communications processor as well as the node itself from the transmitted data. All information in the communication network is transmitted in a modified Mauchly format and will appear as n-bit data or control characters. A binary ONE is represented as a signal level transition from one level to another, while a binary ZERO is represented by an opposite signal transition. A control character, which always precedes a data character, will either be the address of a node or a null. To read information from the network, the node must detect a control character which represents its address. To insert information into the network the node must detect a control character which represents a null.

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patent: 3879710 (1975-04-01), Maxemchuck et al.
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