1、NORMEINTERNATIONALEINTERNATIONALSTAN DARDCEIIEC606401979AMENDEMENT 1AMENDMENT 11984-03Amendement 1Systme CAMAC Interface pour Interconnexion de Branche SrieAmendment 1CAMAC Serial Highway Interface System IEC 1984 Droits de reproduction rservs Copyright-all rights reservedInternational Electrotechni
2、cal Commission?3,rue de Varemb Geneva,SwitzerlandTelefax:+41 22 919 0300?e-mail:inmailiec.ch?IEC web site http:/www.iec.chIECCommission Electrotechnique InternationaleInternational Electrotechnical CommissionMeminniapoxalas 3neKTpoTeXHH4ecKan HOMHCCHH?CODE PRIXPRICE CODEPour prix,voir catalogue en v
3、igueurFor price,see current catalogueLICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.Entre de laligne de signauxsymtriques 100 S20?100 S2+5%2 640 mod.1 C E I 1984Page 6SommaireRemplacer le titre de la figure 25 par:Exemple de rcepteur
4、de signaux symtriques.Ajouter:Figure 25a.Exemple dun rcepteur hystrsis obtenue par rsistances externes.Page 8832.4 Rcepteur de signaux symtriquesAjouter un troisime alina comme suit:Si lentre dun Contrleur de Chssis Srie se trouve dconnecte,ce qui peut arriver danscertaines configurations de by-pass
5、,ce Contrleur de Chssis Srie peut recevoir des mes-sages errons dus au bruit lentre du rcepteur.Il est alors recommand dutiliser desrcepteurs de ligne avec hystrsis lentre,au moins pour le rcepteur horloge.Un exemplede tels rcepteurs de ligne est donn la figure 25(la Recommandation V.11 du C.C.I.T.T
6、.).Dans certains types de rcepteurs il peut tre ncessaire de modifier lhystrsis de lextrieurau moyen de rsistances,comme le montre la figure 25a.Page 94Figure 25Remplacer la figure existante par ce qui suit:O?Sortiedh 9637 ou14 MC 3486054/84FIG.25.Exemple de rcepteur de signaux symtriques.LICENSED T
7、O MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.640 Amend.1 I E C 19843Page 1ContentsReplace the title of Figure 25 by:Example of a balanced receiver.Add:Figure 25a.Example of a receiver with hysteresis added by use of external resistors.Page 89
8、32.4 Balanced receiverAdd a third paragraph as follows:If the input to an SCC becomes disconnected,such as could occur in certain by-passingconfigurations,the SCC may receive erroneous messages due to noise at the receiver inputs.It is therefore recommended that line receivers with input hysteresis
9、be used at least for theclock receiver.An example of such line receivers conforming to C.C.I.T.T.RecommendationV.11 is shown in Figure 25.Some types of receivers may require external hysteresis,added bymeans of resistors as shown in Figure 25a.Page 95Figure 25Replace the existing figure by the follo
10、wing:0?Input from 100 S2balanced line100 S25%OutputO?%9637 or 14 MC 3486054/84FIG.25.Example of a balanced receiver.LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.Entre de laligne de signauxsymtriques 100 S2139K(?I?(?II120KI?!IL-5 V _
11、 JCircuitpour lobtentionde lhystrsis100+5%055/84f 75107,7520775108,75208Ajouter la figure 25a ci-dessous:Rsistances 1 000 S2appaires 1%Q SortieRsistances4 000 S2appaires 1%4640 mod.1 C E I 1984FIG.25a.Page 130 Exemple dunrcepteur hystrsis obtenue par rsistances externes.A la fin du premier alina,rem
12、placer(bit 7 dans ltat 1)par:(bit 7 dans ltat I)Page 132paragraphe 47.3Remplacer SOMME par som-LPage 144paragraphe 54.2Remplacer SOMME-L par Som-LPage 1522e alinaRemplacer soMME-L par som-LPage 154paragraphe 57.2Remplacer SIGMA-L par som-LPage 227Remplacer SIGMA-L par Som-LLICENSED TO MECON Limited.
13、-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.055/84640 Amend.I I E C 1984 5 Add Figure 25a as below:FIG.25a.Example of a receiver with hysteresis added by use of external resistors.Page 131At the end of the first paragraph replace(Bit 7=1)by:(Bit 7=I)Page 13
14、3Sub-clause 47.3Replace L-sum by L-sumPage 145Sub-clause 54.2Replace L-suM by L-sumPage 1532nd paragraphReplace L-SUM by L-sumPage 155Sub-clause 57.2Replace L-SUM by L-sumPage 233Replace L-suM by L-sumLICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.ICS 27.120Typeset and printed by the IEC Central OfficeGENEVA,SWITZERLANDLICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.
