CSN EN IEC 62769-3 ed. 3 This part of IEC 62769 specifies the FDI® Server. 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. Annex A provides a functional description of the FDI® Server. Original English text of CSN EN Standard. The price of the Standard included all amendments and correcturs.