Browse Prior Art Database

MULTIPLEXED CURRENT LOOPS FOR ANALOG DATA TRANSMISSION

IP.com Disclosure Number: IPCOM000026475D
Original Publication Date: 1992-Apr-30
Included in the Prior Art Database: 2004-Apr-05
Document File: 4 page(s) / 148K

Publishing Venue

Xerox Disclosure Journal

Abstract

Traditionally, the transmission of analog signals within copier/duplicator environments has resulted in problems, due to the susceptibility of the analog signals to noise. With the use of numerous high voltage and switching power supplies within such systems, the presence of this problem is not unexpected. The noise problem lead to a consideration of current loops for the transmission of analog signals within the copiers, as these techniques are frequently used in factory environments where the same electronic noise sources are generally present. However, the typical current loop system requires at least two signal wires from the controller for each input and an additional two wires for power, resulting in a total of four wires for each output or remote transceiver. Hence, the cost of such a system is relatively high, given the need for the large number of wires, in addition to the line drivers or receivers associated with each wire. Overcoming the rather large hardware requirement for each transceiver would reduce the overall cost of such a system.

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 55% of the total text.

Page 1 of 4

XEROX DISCLOSURE JOURNAL

MULTIPLEXED CURRENT LO 0 P S FOR ANALOG DATA TRANSMISSION Benjamin D. Brown

Proposed Classification US. C1.355/202
Int. C1. G03g 21/00

POWER

Regulator

1 OUT

FIG. I

XEROX DISCLOSURE JOURNAL - Vol. 17, No. 2 MarcWAprill992 91

[This page contains 1 picture or other non-text object]

Page 2 of 4

MULTIPLEXED CURRENT LOOPS FOR ANALOG DATA TRANSMISSION(Cont'd)

f-

-

Analog Remote #O

Analog Remote #1

++#2 #8t

\\ -------

- - -I- I- 1- -1

I

__--_________-------------------------------,

: 50 Clocks between updates

i All outputs are updated every cycle

: Update time @40KHz = 1.25 ms

i Update time @50KHz = 1 .O ms

i Currents are 1 to 11 ma, outputs o to 10 v

I_---__________---------------------.-------.


I

-I- -I- -

+- Analog Remote #O

92 XEROX DISCLOSURE JOURNAL - Vol. 17, No. 2 MarcWAprill992

-+- Analog Remote #1 +

FIG. 2

[This page contains 1 picture or other non-text object]

Page 3 of 4

MULTIPLEXED CURRENT LOOPS FOR ANALOG DATA TRANSMISSION(Cont'8

Traditionally, the transmission of analog signals within copier/duplicator environments has resulted in problems, due to the susceptibility of the analog signals to noise. With the use of numerous high voltage and switching power supplies within such systems, the presence of this problem is not unexpected. The noise problem lead to a consideration of current loops for the transmission of analog signals within the copiers, as these techniques are frequently used in factory environments where the same electronic noise sources are generally present. However, the typical current loop system requires at least two signal wires from the controller for each input and an additional two wires for power, resulting in a total of four wires for each output or remote transceiver. Hence, the cost of such a system is relatively high, given the need for the large number of wires, in addition to the line drivers or receivers associated with each wire. Overcoming the rather large hardware requirement for each transceiver would reduce...