A4.4 Detailed Interface Specifications

Structure and Organization Overview. The CDF shall consist of two files of data records.

Substructure Definition and Format. The first data file, the CDF file, is written in binary format and consists of a set of records, each beginning with an SFDU header and followed by the experiment data block. The physical blocks vary in size but are a maximum of 10000 bytes. The format and description may be found in Section A4.5.3.

The second data file, the HED CDR Average File, is written in ASCII with a block size of 10000 bytes and a record size of 47 bytes blocked at 9964 bytes. The format and description may be found in Section A4.5.4.

SFDU Headers. The Ulysses CDF utilizes the Standard Formatted Data Unit (SFDU) system of headers. Described in detail below are the multi-mission primary and secondary headers (Figure A4-1, Table A4-1) and the tertiary header (Figure A4-2, Table A4-2) which is unique to the ULS Common Data Record.

Figure A4-1 ULS SFDU primary and secondary header format

Table A4-1 ULS SFDU primary and secondary header description

Figure A4-2 ULS SFDU tertiary header format

Table A4-2 ULS SFDU tertiary header description

Continued:

• A4.5 CDF Data Record Format Specifications
• A4.6 List of Acronyms and Abbreviations

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