# Council Directive 1999/37/EC of 29 April 1999 on the registration documents for vehicles, Division D: Transmission protocol T = 1

Extent: E+W+S+N.I.

The support of chaining is mandatory.
The following simplifications are allowed:
NAD Byte: not used (NAD should be set to ‘ 00 ’ ),
S-Block ABORT: not used,
S-Block VPP state error: not used.
The information field size device (IFSD) shall be indicated from the IFD immediately after ATR, i.e. the IFD shall transmit the S-block IFS request after ATR and the card shall send back S-block IFS. The recommended value for IFSD is 254 bytes.

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Source: https://www.legislation.gov.uk/eudr/1999/37/annex/II/division/III/division/III.6/division/D (the official version)
Page: https://openlegislation.uk/eu-directive-1999-37/annex-II/division-III/division-III.6/division-D
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.