BS 4505-3: BRITISHSTANDARD 1981 ISO 1155-1978 Digital data transmission- Part3:Methodforuseoflongitudinal paritytodetecterrorsininformation messages- [ISO title: Information processing- Use of longitudinal parityto detect errors ininformationmessages UDC681.327.8 NOCOPYINGWITHOUTBSIPERMISSIONEXCEPTASPERMITTEDBYCOPYRIGHTLAW BS4505-3:1981 Cooperating organizations TheData Processing Standards Committee,underwhosedirectionthis British Standard was prepared, consists of representatives from thefollowing: British Computer Society Ltd. British Paper and Board Industry Federation (PIF) British Printing Industries'Federation Business Equipment Trade Association* Central Computer and Telecommunications Ageney (Civil Service Department)* Committee of London Clearing Bankers on behalf of the Committee of Scottish Clearing Bankers, Co-operative Bank, Central Trustee Savings Bank and Yorkshire Bank* Department of Industry (Computers, Systems and Electronics) Department of Industry (National Physical Laboratory)* Electricity Supply Industry in England and Wales* Government Communications Headquarters HM Customs andExcise Institute of Cost and Management Accountants Institute of Purchasing and Supply Institution of Electrical Engineers Inter-university Committee on Computing London TransportExecutive National Computer Users'Forum National Computing Centre Ltd.* National Research Development Corporation Post Office* Society of British Aerospace Companies Limited Theorganizationsmarked with an asterisk in the above list,together with the following,weredirectlyrepresentedontheTechnical Committee entrusted withthepreparationofthisBritishStandard: BritishAirways British Electrical and Allied Manufacturers' Association (BEAMA) British Gas Corporation British Railways Board Business Equipment Trade Association CivilAviationAuthority Engineering Equipment Users'Association Ministry of Defence Telecommunication Engineering and Manufacturing Association (T EMA) This British Standard, having been prepared under the direction of theData Processing Standards Committee,was published underthe authority of the Board of BSI and comes into effecton 30 November 1981 @BSI03-1999 Amendments issued sincepublication First published September 1969 Amd. No. Date of issue Comments First revision Novem ber 1981 The following BSI references relate to the work on this standard: Committee reference OIS/6 Draft for comment 81/60119 DC ISBN0580123723 BS4505-3:1981 Contents Page Cooperating organizations Insidefront cover Nationalforeword i 0 Introduction 1 1 Scopeandfieldofapplication 1 Rules for generating the longitudinal parity block check character 1 2 Publications referredto Insidebackcover CBSI03-1999