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3.1.5.1.1 DVC Data First (DYNVC_DATA_FIRST)

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When the length of the message data being sent exceeds 1,590 bytes, the DYNVC_DATA_FIRST (section 2.2.3.1) PDU is sent as the first data PDU. The Length field is set to the total length of the message, and the Data field contains the first block of fragmented data. Subsequent DYNVC_DATA (section 2.2.3.2) PDUs are sent until all the data has been sent.

To send compressed data, the DYNVC_DATA_FIRST_COMPRESSED (section 2.2.3.3) PDU can be used in place of the DYNVC_DATA_FIRST PDU, as specified in section 3.1.5.1.3.