IEC 62386-201:2009 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, associated with fluorescent lamps. This part 201 is intended to be used in conjunction with IEC 62386-101 and IEC 62386-102, which contain general requirements for the relevant product type (control gear or control devices). IEC 62386-101, IEC 62386-102 and IEC 62386-201 replace IEC 60929 Edition 3, Clause E.4 "Control by digital signals" and Annex G "Test procedures for ballasts with digital control interface according to Clause E.4".