IEC 62386-102:2009 specifies a protocol and methods of test for the control by digital signals of electronic control gear for use on a.c. or d.c. supplies. This Part 102 is intended to be used in conjunction with Part 101, which contains general requirements for the relevant product type (system), and with the appropriate part 2XX (particular requirements for control gear) containing clauses to supplement or modify the corresponding clauses in Parts 101 and 102 in order to provide the relevant requirements for each type of product. This International Standard, together with IEC 62386-101 and IEC 62386-201, replaces Clause E.4, \'Control by digital signals\', and Annex G, \'Test procedures for ballasts with digital control interface according to Clause E.4\', of IEC 60929:2006.