CSN EN IEC 62769-2 ed. 3 This part of IEC 62769 specifies the FDIR Client. See Annex C for some typical FDI® Client use cases. The overall FDI® architecture is illustrated in Figure 1. The architectural components that are within the scope of this document have been highlighted in this figure. Original English text of CSN EN Standard. The price of the Standard included all amendments and correcturs.