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A8.4 Detailed Interface Specification

A8.4.1 Overview of Structure and Organization

There will be only one file of SEDRs on each tape written for dissemination to the ULS PIs. (As a matter of consistency and predictability in operations, the DMT will limit the size of the SEDR file to that which will fit on a single reel of magnetic tape.) The SEDR file on tape shall terminate with two end-of-file tape markers. The layout of the SEDR file on tape is presented in Figure A8-1. There will be no internal tape labels on the SEDR tapes.

Figure A8-1 SEDR tape layout

There will be two SEDR formats, integer or floating-point. Tertiary-SFDU-header word 24 of the first SEDR in the file shall identify which of the two formats shall be used for the remainder of the file. Details of this scheme are found in Section A8.4.2.

A8.4.2 Substructure Definition and Format

The SEDR shall consist of three SFDU headers followed by a block of the supplementary experiment data (Figure A8-2). Each word in an SEDR shall be 32-bits in length. The first word in the SEDR shall be the first 3 bits of the primary SFDU header. All words in each SEDR shall be counted consecutively from this first word. Thus, since the three SFDU headers take up the first through the 25th word in the SEDR, the actual supplementary experiment data will appear in the 26th through the 288th words in the SEDR.

In the case of an integer format SEDR, an additional record, the scale factor block (Figure A8-3) will appear as the first record on the SEDR.

Figure A8-2 Data Block	Figure A8-3 Scale Factor Block

SFDU Headers. The format of the primary and secondary SFDU headers for the SEDR is presented in Figure A8-4 and is specified in detail in Table A8-4. The format of the tertiary SFDU header for the SEDR is presented in Figure A8-5 and is specified in Table A8-5.

Figure A8-4 ULS SEDR primary and secondary SFDU headers

Table A8-4 ULS SEDR primary and secondary SFDU header definition

Figure A8-5 ULS SEDR tertiary SFDU header

Table A8-5 ULS SEDR tertiary SFDU header definition

SEDR Contents. The contents of the SEDR (i.e., what word represents which parameter) are presented in Table A8-6.

Next: A8.5 Glossary and A8.6 List of Acronyms and Abbreviations

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