IEC 62386-101:2009 specifies a protocol for control by digital signals of electronic lighting equipment used on a.c. or d.c. supplies. This Part 101 is intended to be used in conjunction with Part 102, which contains general requirements for the relevant product type (control gear), 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 62386-102 and IEC 62386-201, replaces Clause E.4, "Control by digital signals", and Annex G, "Test procedures".