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The imcRawBuster provides access to the proprietary data format IMC Bus Format with file extension .raw introduced and developed by imc Test & Measurement GmbH. This data format is employed i.a. by the measurement hardware imc CRONOSflex to dump and store data and the software packages imc Studio and imc FAMOS for measurement data control and analysis. The extracted measurement data can be stored in various open source file formats like csv, json, parquet or hdf5.

Overview

Fileformat

A data file of IMC Bus Format type with extension .raw is a mixed text/binary file featuring a set of markers (keys) that indicate the start of various blocks of data providing meta information and the actual measurement data. Every single marker is introduced by character "|" = 0x 7c followed by two uppercase letters, which characterize the type of marker. Each block is further divided into several parameters separated by commata "," = 0x 2c and terminated by a semicolon ";" = 0x 3b. For instance, the header - first 600 bytes - of a raw file may look like this (in UTF-8 encoding)

|CF,2,1,1;|CK,1,3,1,1;
|NO,1,86,0,78,imc STUDIO 5.0 R10 (04.08.2017)@imc DEVICES 2.9R7 (25.7.2017)@imcDev__15190567,0,;
|CG,1,5,1,1,1; |CD,2,  63,  5.0000000000000001E-03,1,1,s,0,0,0,  0.0000000000000000E+00,1;
|NT,1,16,1,1,1980,0,0,0.0;       |CC,1,3,1,1;|CP,1,16,1,4,7,32,0,0,1,0;
|CR,1,60,0,  1.0000000000000000E+00,  0.0000000000000000E+00,1,4,mbar;|CN,1,27,0,0,0,15,pressure_Vacuum,0,;
|Cb,1, 117,1,0,    1,         1,         0,      9608,         0,      9608,1,  2.0440300000000000E+03,  1.2416717060000000E+09,;
|CS,1,      9619,         1,<2C>oD	<09>nD6<44>nD)<29>nD<6E>

where line breaks where introduced for readability. Most of the markers introduce blocks of text, while only the last one identified by |CS contains binary data. The format supports the storage of multiple data sets (channels) in a single file. The channels may be ordered in multiplex mode (ordering w.r.t. time) or block mode (ordering w.r.t. to channels).

Markers

The markers (keys) are introduced by "|" = 0x 7c followed by two uppercase letters. There are two types of markers distinguished by the first letter:

  1. critical markers: introduced by |C featuring uppercase C
  2. noncritical markers: introduced by |N featuring uppercase N

The second letter represents further details of the specific key. Note, that while the noncritical keys are optional, any .raw file cannot be correctly decoded if any of the critical markers are misinterpreted, invalid or damaged. The second uppercase letter is followed by the first comma and the version of the key starting from 1. After the next comma, an (long) integer (in text representation) specifies the length of the entire block, i.e. the number of bytes between the following comma and the block-terminating semicolon. The further structure of a block is not defined and may feature different numbers of additional parameters. The format allows for any number of carriage returns (CR = 0x0d) and line feeds (LF = 0x 0a) between keys, i.e. the block terminating semicolon and the vertical bar (pipe) of the next key. The following critical markers are defined

Installation

Usage

References

Deprecated!!

The following markers are defined:

  1. CF (0x 43 46)
  2. CK (0x 43 4b)
  3. NO (0x 4e 4f)
  4. CG (0x 43 47)
  5. CD (0x 43 44)
  6. NT (0x 4e 54)
  7. CC (0x 43 43)
  8. CP (0x 43 50)
  9. CR (0x 43 52)
  10. CN (0x 43 4e)
  11. Cb (0x 43 62)
  12. CS (0x 43 53)

Each of these markers are followed by multiple commata (0x 2c) separated parameters and are terminated by a semicolon ; = 0x 3b, except for the sequence following the data marker CS, that may have any number of 0x3b occurencies, while still terminated by a semicolon at the very end of the file (since CS is the last marker section in the file). The markers have the following meaning:

  • CF (3 parameters) |CF,2,1,1; specifies file format, key length and processor

  • CK (4 parameters) |CK,1,3,1,1; start of group of keys

  • NO (6 parameters) |NO,1,85,0,77,imc STUDIO 5.0 R3 (10.09.2015)@imc DEVICES 2.8R7 (26.8.2015)@imcDev__15190567,0,; origin of the file, provides some info about the software package/device and its version

  • CB (6 parameters) group definition

  • CT (8 parameters) text definition

  • CG (5 parameters) |CG,1,5,1,1,1; definition of a data field |CG,1,KeyLang,AnzahlKomponenten,Feldtyp,Dimension;

  • CD (mostly 11 parameters) since we're dealing with measured entities from the lab this markers contains info about the measurement frequency, i.e. sample rate. For instance |CD,2, 63, 5.0000000000000001E-03,1,1,s,0,0,0, 0.0000000000000000E+00,1; indicates a measured entity every 0.005 seconds, i.e. a sample rate = 200Hz

  • NT (7 parameters) |NT,1,16,1,1,1980,0,0,0.0; |NT,1,KeyLang,Tag,Monat,Jahr,Stunden,Minuten,Sekunden; triggerzeit

  • CC (mostly 4 parameters) |CC,1,3,1,1; Start einer Komponente (component)

  • CP (9 parameters) |CP,1,16,1,4,7,32,0,0,1,0; Pack-Information zu dieser Komponente CP,1,KeyLang,BufferReferenz,Bytes,Zahlenformat,SignBits,Maske,Offset,DirekteFolgeAnzahl,AbstandBytes; Bytes = 1...8 Zahlenformat : 1 = unsigned byte 2 = signed byte 3 = unsigned short 4 = signed short 5 = unsigned long 6 = signed long 7 = float 8 = double 9 = imc Devices 10 = timestamp ascii 11 = 12 = 13 =

  • CR (7 parameters) Wertebereich der Komponente, nur bei analogen, nicht bei digitalen Daten. |CR,1,KeyLang,Transformieren,Faktor,Offset,Kalibriert,EinheitLang, Einheit; provides the physical unit of the measured entity, maybe shows the minimum and maximum value during the measurment, e.g. |CR,1,60,0, 1.0000000000000000E+00, 0.0000000000000000E+00,1,4,mbar; Transformieren : 0 = nein 1 = ja, mit faktor und offset transformieren (für ganzzahlige Rohdaten) Faktor,Offset: physikalischer Wert = Faktor * Rohdatenwerten + Offset

  • CN (mostly 9 parameters) gives the name of the measured entity |CN,1,KeyLang,IndexGruppe,0,IndexBit,NameLang,Name,KommLang,Kommentar; |CN,1,27,0,0,0,15,pressure_Vacuum,0,;

  • Cb (mostly 14 paramters) (optional?) this one probably gives the minimum/maximum measured values!! |Cb,1,117,1,0,1,1,0,341288,0,341288,1,0.0000000000000000E+00,1.1781711390000000E+09,;

  • CS (mostly 4 parameters) this markers announces the actual measurement data in binary format, provide the number of values and the actual data, e.g. |CS,1, 341299, 1, ...data... ;

Open Issues and question?

  • which parameter indicate(s) little vs. big endian?

.parquet-file writer

The extracted and converted data originating from the *.raw file format may be efficiently grouped and written as .parquet files parquet file writer example

References

Parquet