Browse Prior Art Database

Configuration Control With Variable Addressing

IP.com Disclosure Number: IPCOM000081853D
Original Publication Date: 1974-Aug-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 71K

Publishing Venue

IBM

Related People

Reiley, FA: AUTHOR

Abstract

It is often desirable to multidrop clusters of terminals with their associated control units (or cluster control function) from a single communications line. The following describes a means for addressing terminals within a cluster, using only a single set of configuration switches associated with the control-unit function for each cluster. This assumes a maximum of 16 terminals attached to the communications line (maximum of 16 addresses required) and from one to four terminals per cluster.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Configuration Control With Variable Addressing

It is often desirable to multidrop clusters of terminals with their associated control units (or cluster control function) from a single communications line. The following describes a means for addressing terminals within a cluster, using only a single set of configuration switches associated with the control-unit function for each cluster. This assumes a maximum of 16 terminals attached to the communications line (maximum of 16 addresses required) and from one to four terminals per cluster.

In the figure, a set of configuration switches 1 (e.g., 4 SPST switches) is set to represent some binary number N, where N = 0000, 0001, .... , 1110 or 1111. Decoder 2 compares the value of the configuration switches with the value of the address 3 that has been received from the communications line. The value of the address is a binary number M, where M = 0000, 0001, .... , 1110 or 1111. The decoder has four outputs, 4, 5, 6 and 7. Output 4 is activated when M = N; output 5 is activated when M = N+1, and so on. The decoder outputs then select or activate a terminal within the terminal cluster 8.

The complete decoder logic is shown in the table below.

(Image Omitted)

A.

1

Page 2 of 2

2

[This page contains 6 pictures or other non-text objects]