GB2008361A - Method and apparatus for serially transmitting information - Google Patents

Method and apparatus for serially transmitting information

Info

Publication number
GB2008361A
GB2008361A GB7838632A GB7838632A GB2008361A GB 2008361 A GB2008361 A GB 2008361A GB 7838632 A GB7838632 A GB 7838632A GB 7838632 A GB7838632 A GB 7838632A GB 2008361 A GB2008361 A GB 2008361A
Authority
GB
United Kingdom
Prior art keywords
byte
register
change
bit
bits
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB7838632A
Other versions
GB2008361B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NCR Voyix Corp
Original Assignee
NCR Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US05/839,548 external-priority patent/US4168469A/en
Priority claimed from US05/839,483 external-priority patent/US4205200A/en
Application filed by NCR Corp filed Critical NCR Corp
Publication of GB2008361A publication Critical patent/GB2008361A/en
Application granted granted Critical
Publication of GB2008361B publication Critical patent/GB2008361B/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
    • H03M7/40—Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code
    • H03M7/4025—Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code constant length to or from Morse code conversion

Abstract

A method and apparatus for serially transmitting data in the form of messages each including a plurality of bytes of data. The message to be transmitted includes first and second eight bit control bytes which are stored in respective first and second registers 520, 550. A change in byte size from a normal eight bit size during the message is indicated by bit D0 in the first register 520 being "0" the byte size after the change being represented by bits D3-D5. The second control byte indicates the location of the change. A counter 400 produces a carry output on an output line 454 for each byte transmitted, such carry output controlling the production of a load control signal for a shift register in which the data bits are entered prior to transmission. As each byte is transmitted, the count in the second register 550 is decremented and when zero is reached therein, the bits D3-D5 are loaded into a control register 560 so that thereafter the counter 400 is recycled through a count corresponding to the new byte size. <IMAGE>
GB7838632A 1977-10-04 1978-09-29 Method and apparatus for werially transmitting information Expired GB2008361B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US05/839,548 US4168469A (en) 1977-10-04 1977-10-04 Digital data communication adapter
US05/839,483 US4205200A (en) 1977-10-04 1977-10-04 Digital communications system utilizing controllable field size

Publications (2)

Publication Number Publication Date
GB2008361A true GB2008361A (en) 1979-05-31
GB2008361B GB2008361B (en) 1982-03-24

Family

ID=27126111

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7838632A Expired GB2008361B (en) 1977-10-04 1978-09-29 Method and apparatus for werially transmitting information

Country Status (3)

Country Link
DE (1) DE2843227C3 (en)
FR (1) FR2405599B1 (en)
GB (1) GB2008361B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112131153A (en) * 2020-09-15 2020-12-25 北京自动化控制设备研究所 Method for real-time communication by using serial port of ARM processor

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3403226A (en) * 1965-09-30 1968-09-24 Bell Telephone Labor Inc Reduced bandwidth dual mode encoding of video signals
US4135214A (en) * 1969-07-02 1979-01-16 Dacom, Inc. Method and apparatus for compressing facsimile transmission data
US3680057A (en) * 1970-11-02 1972-07-25 Honeywell Inf Systems Data communications subchannel
US3739085A (en) * 1971-07-09 1973-06-12 Addressograph Multigraph Coding technique
US4161719A (en) * 1977-10-04 1979-07-17 Ncr Corporation System for controlling synchronization in a digital communication system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112131153A (en) * 2020-09-15 2020-12-25 北京自动化控制设备研究所 Method for real-time communication by using serial port of ARM processor
CN112131153B (en) * 2020-09-15 2024-04-02 北京自动化控制设备研究所 Method for carrying out real-time communication by using ARM processor serial port

Also Published As

Publication number Publication date
FR2405599A1 (en) 1979-05-04
DE2843227C3 (en) 1981-05-21
GB2008361B (en) 1982-03-24
FR2405599B1 (en) 1987-02-20
DE2843227A1 (en) 1979-04-05
DE2843227B2 (en) 1980-09-04

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Legal Events

Date Code Title Description
746 Register noted 'licences of right' (sect. 46/1977)
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19970929