IS 12746 : Part 3 : 1995/IEC PUB 870-3 : 1989 Telecontrol equipment and systems:Part 3 Interfaces (Electrical Characteristics)

UDC 621.398 : 681.327.8 LTD 10
Reaffirmed 2023

NATIONAL FOREWORD

This Indian Standard (Part 3) which is identical with lEC/Pub870-3 : 1989 `Telecontrol equipment and systems : Part 3 Interfaces(electrical characteristics)', issued by the InternationalElectrotechnical Commission (IEC), was adopted by the Bureau ofIndian Standards on the recommendation of the Power Line CarrierSystems and Associated Telecontrol Equipment Sectional Committee(LTD 25) and approval of the Electronics and TelecommunicationDivision Council.

The text of the IEC standard has been approved as suitable forpublication as Indian Standard without deviation except This:

Technical Deviations

International Standard Corresponding Indian Standard
IEC Pub 50-371 : 1984 IS 1885 : Part 50 : 1985 Electrotechnicalvocabulary :Part 50
IEC Pub 495 : 1974 IS 9482 : 1980 Characteristics values ofinputsand outputs of Angle sideband PLC terminals (withAmendment No. 1)
IEC Pub 625 : 1980 IS 10767 : Part 2 : 1983 An interfacesystem forprogrammable measuring instruments (type serial,bit parallel):Part 2 Code and format conventions
IEC Pub 870-4 : 1990 IS 12746 : Part 4 : 1993 Telecontrolequipment andsystems :Part 4 Performance requirements