IEEE C37.232-2011 pdf download IEEE Standard for Com mon Format for Naming Time Sequence Data Files (COMNAME)
3.1 General
A filename may be composed of two parts separated using the dot (“.”) symbol. The first part is the name.and the second part is the extension. The extension is normally used to specify the file type. There are twctypes of files: the first type is program files such as executables (.EXE) and dynamic link libraries (.DLL),and the second type is user files such as initialization files (.INI), comma separated values (.CSV), and textfiles (.TXT).
Filenames are listed in allocation tables. Each entry in the allocation table corresponds to a single file andhas several ficlds, including the filename and the beginning address where the file’s contents are storedThe old 8.3 style filenames are still the most popular and the most restrictive. The newer operating systemssignificantly relaxed those restrictions. Filenames on newer operating systems can be up to 253 characterslong (versus 11 for the old 8.3 style).
3.2 Naming conventions for TSD files
Several naming conventions are in use today. These formats can be organized in three classes: associated.
coded,and sequenced.
Associated means the filename extension defines the type of data storage format. For example, theextensions “HDR”“.CFG” “,DAT and “.INFare used to indicate that the file contents are compatiblewith IEEE Std C37.111TM-1999 (B6). The nonextension part of an associated filename is totally up to theuser.
Coded means the filename contains some information about the event, In this case, the storage format isusually manufacturer specific. For example, certain files that are generated from digital fault recorders havethe event date and time (up to 12/31/2079-23:59:59.99) and the recorder number (up to 255) coded in thefilename. The recorder number is coded in the first two characters of the name, and the date and time arecoded in the last nine characters of the filename. The resulting filename is not friendly, and reading itrequires special decoding software. For example,“G30BQ1EF.063”is the filename assigned by devicenumber 163 on 09/18/1991 at 14:15:00.630. A detailed example of a similar scheme used to compress over70 characters of key event information into the old 8.3 filename format is presented in Annex A.
The sequenced filenames format is an incremental approach to naming files. This method is valid becauscthe resulting filenames are unique. The sequence may appear in the name or in the extension portion of theThe total number of attainable filenames is limited to the maximum value of the numericafilename.sequence. When multiple devices are used, then the device numbers are also coded in the filename. Forexample, some filenames have the location name (up to four characters). the event number (up to fourcharacters, 9999 filenames before overwrite), and the channel group number (up to three characters). A filenamed “MART1743.RCL”indicates that the event was recorded at the Martin Station and that the eventnumber is 1743. The “RCL” extension means that the file contents are from the first 16 analog inputchannels.
3.3 Coding schemes
Filenames are limited in length. Compression, especially where only ll characters are allowed, may beneeded in order to place required key information in the filename. Compression is the technique ofrepresenting a long sequence of information with a brief sequence of codes. Popular data compression
IEEE C37.232-2011 pdf download
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