US4575714A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Module presence sensor
Assignee: Motorola Solutions Inc
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Filing: 1984-03-12
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Granted: 1986-03-11
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Expires: 2004-03-12
Abstract
Abstract In a processing system comprising a plurality of modules, the presence of one or more modules is sensed at a control unit through the use of an analog encoder and an A/D converter. The modules terminate selected resistors in a binary resistance network in the analog encoder to produce a unique signal via the A/D converter for each combination of modules in the system. The encoder requires a minimal number of signal lines and no multiplexing of signals.
Inventors
- 👤 Paul W. Rummel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:10
CPC Classifications
G; G06; G06F; G06F13/00; G06F13/38; G06F13/40; G06F13/4063; G06F13/4068
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
68 words
A system for sensing the presence of peripheral modules comprising: analogue encoding means, connected to one or more of said peripheral modules , for producing a unique signal in response to each combination of peripheral modules connected thereto; analogue to digital conversion means for converting said signal into a corresponding digital signal; and digital means for controlling said modules in accordance with the content of said digital signal.
Claim 2
Independent Claim
68 words
A system for sensing the presence of peripheral modules comprising: analogue encoding means, connected to one or more of said peripheral modules , for producing a unique signal in response to each combination of peripheral modules connected thereto; analogue to digital conversion means for converting said signal into a corresponding digital signal; and digital means for controlling said modules in accordance with the content of said digital signal.
Claim 3
Dependent Claim
32 words
The system as set forth in claim 1 wherein said digital means provides an error indication when said predetermined digital signal indicates that no modules are connected to said analogue encoding means.
Claim 4
Dependent Claim
59 words
The system as set forth in claim 1 wherein said analogue encoding means comprises: a plurality of impedance elements having one end of each connected in common and the other end of each connectable to a peripheral module; a source of reference voltage; and current to voltage conversion means interconnecting said common ends and said source of reference voltage.
Claim 5
Dependent Claim
19 words
The system as set forth in claim 3 wherein the impedance of each of said impedance elements is unique.
Claim 6
Dependent Claim
17 words
The system as set forth in claim 4 wherein the impedances are related by powers of two.
Claim 7
Dependent Claim
24 words
The system as set forth in claim 5 wherein said other ends are arranged in groups to provide standard bus connections for different modules.
References Cited (Backward Citations)
US4467273A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-10 | 1989-09-09 | 1990-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-10 | 1993-09-09 | 1994-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-10 | 1997-09-09 | 1998-03-11 | $7700.00 | Window Closed / Lapsed |