US3825696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital data interface system
Assignee: DDI Communications Inc
•
Filing: 1973-02-20
•
Granted: 1974-07-23
•
Expires: 1993-02-20
Abstract
Abstract An interface system is disclosed for digital data with the data appearing on a transmitter assembly as plural bits defining individual digitized words in a sentence. One or more words is established on each of a plurality of transmitter extenders and each transmitter extender is scanned in sequence by clock pulses to determine simultaneously the status of all bits in a word. Enabling means is provided in the transmitter assembly which develops a check advance pulse as each extender or word is being scanned. Reset means establishes reset of the scanning means upon unequal outputs from the clock pulse and from the enabling means being supplied to a comparator such as occurs at the end of the sequence of extenders. A change detector is connected on each word input means to detect a change in any of the plural bits of a digitized word. Upon detecting a change, an interrupt signal is generated. As each extender is scanned, the scan passes through the extender by actuating the enabling means if there is no change in the word. If there is a change in the word, the interrupt signal freezes the scan and establishes the status of the word on a plurality of conductors interconnecting the transmitter extenders. Address information as to the address of the changed word is produced and both the address information and status information is thus available to a computer which acknowledges the information and restarts the scanning. The foregoing abstract is merely a resume of one general application is not a complete discussion of all principles of operation or applications, and is not to be construed as a limitation on the scope of the claimed subject matter.
Inventors
- 👤 R Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:07
CPC Classifications
G; G08; G08B; G08B26/00; G06; G06F; G06F13/00; G06F13/14; G06F13/20; G06F13/22
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
139 words
A digital data interface system, comprising in combination, a transmitter assembly having a plurality of signalling points arranged in groups with each group establishing a word of a sentence, input means to apply digits to said signalling points of said transmitter assembly with each digit being one of at least two states, scanning means in said transmitter assembly, means connecting said scanning means to scan the words in sequence in said transmitter assembly, change detector means in said transmitter assembly connected to said input means to detect a change in the state of a digit of a word, a first plurality of conductors, means connecting said plurality of conductors in parallel to said transmitter assembly, and word status information means connected to establish information as to the changed state of the digit of the word on said paralleled conductors.
Claim 2
Dependent Claim
139 words
A digital data interface system, comprising in combination, a transmitter assembly having a plurality of signalling points arranged in groups with each group establishing a word of a sentence, input means to apply digits to said signalling points of said transmitter assembly with each digit being one of at least two states, scanning means in said transmitter assembly, means connecting said scanning means to scan the words in sequence in said transmitter assembly, change detector means in said transmitter assembly connected to said input means to detect a change in the state of a digit of a word, a first plurality of conductors, means connecting said plurality of conductors in parallel to said transmitter assembly, and word status information means connected to establish information as to the changed state of the digit of the word on said paralleled conductors.
Claim 3
Dependent Claim
34 words
An interface system as set forth in claim 1, including means in said scanning means to halt the scan of a changed word upon determining that the word has changed since the last scan.
Claim 4
Dependent Claim
34 words
An interface system as set forth in claim 2, including means to develop an interrupt signal upon the halting of said scanning means, and acknowledge signal means to establish restarting of said scanning means.
Claim 5
Dependent Claim
28 words
An interface system as set forth in claim 1, including plural bit addressing information means to establish information as to the position of the word in the sentence.
Claim 6
Dependent Claim
40 words
An interface system as set forth in claim 1, wherein said transmitter assembly includes an interface transmitter, at least one interface transmitter extender, and said input applying to each interface transmitter extender at least one digitized word of a sentence.
Claim 7
Dependent Claim
34 words
An interface system as set forth in claim 1, wherein said word status information means is connected to establish information as to the state of the digits of each word on said paralleled conductors.
Claim 8
Dependent Claim
73 words
An interface system as set forth in claim 1, including enabling means connected to said at least one transmitter extender, means in said scanning means to determine that the scanned word has remained the same since the last scan, and means in said scanning means to actuate said enabling means to move the scan sequence to the next word upon determining that the scanned word has remained the same since the last scan.
Claim 9
Dependent Claim
30 words
An interface system as set forth in claim 7, including gate means in said scanning means to halt the scan at a changed word by not actuating said enabling means.
Claim 10
Dependent Claim
82 words
A digital data interface system, comprising in combination, a transmitter assembly, a plurality of interface transmitter extenders in said transmitter assembly, word input means to apply to each interface transmitter extender one or more plural bit digitized words of a sentence, scanning means in said transmitter assembly, and means connecting said scanning means to scan said transmitter extenders in sequence to determine simultaneously the status of the plural bits in a single word, each bit having one of at least two states.
Claim 11
Dependent Claim
82 words
A digital data interface system, comprising in combination, a transmitter assembly, a plurality of interface transmitter extenders in said transmitter assembly, word input means to apply to each interface transmitter extender one or more plural bit digitized words of a sentence, scanning means in said transmitter assembly, and means connecting said scanning means to scan said transmitter extenders in sequence to determine simultaneously the status of the plural bits in a single word, each bit having one of at least two states.
Claim 12
Dependent Claim
28 words
An interface system as set forth in claim 9, including a computer interface transmitter in said transmitter assembly, and wherein said scanning means is connected in said transmitter.
Claim 13
Dependent Claim
42 words
An interface system as set forth in claim 9, including a first plurality of conductors connected in parallel to each of said transmitter extenders, and means to establish the status of the plural bits of each word on said plurality of conductors.
Claim 14
Dependent Claim
43 words
An interface system as set forth in claim 9, including a pulse generator developing pulses in said scanning means, and means connecting said pulse generator to apply pulses to said extenders in sequence to scan the status of the words in said extenders.
Claim 15
Dependent Claim
38 words
An interface system as set forth in claim 9, including enabling means in said transmitter assembly, and means connecting said scanning means to scan said transmitter extenders in sequence determined by said enabling means enabling a respective extender.
Claim 16
Dependent Claim
63 words
An interface system as set forth in claim 9, including a first plurality of conductors connected in parallel to each of said transmitter extenders, and wherein said scanning means connection means emits an interrupt signal upon the occurrence of a change in any of said bits and also to establish the status of said plural bit word on said plurality of paralleled conductors.
Claim 17
Dependent Claim
53 words
An interface system as set forth in claim 9, including a plural bit change detector in said transmitter assembly connected to detect a change in any part of said data on the input to said change detector, and means in said change detector to emit an interrupt signal upon detection of a change.
Claim 18
Dependent Claim
33 words
An interface system as set forth in claim 15, wherein said change detector includes plural comparators connected to detect a change in any of said incoming data bits to emit said interrupt signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |