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DP44/docs/ai/Common/DTS.Common.Serialization/TDAS.md
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2026-04-17 14:55:32 -04:00

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source_files, generated_at, model, schema_version, sha256
source_files generated_at model schema_version sha256
Common/DTS.Common.Serialization/TDAS/TDAS.File.Reader.BadCrcException.cs
Common/DTS.Common.Serialization/TDAS/TDAS.File.Reader.MissingFileException.cs
Common/DTS.Common.Serialization/TDAS/TDAS.File.Reader.TooManyFilesException.cs
Common/DTS.Common.Serialization/TDAS/TDAS.File.IChannelHeader.cs
Common/DTS.Common.Serialization/TDAS/TDAS.File.PersistentChannel.NotInitializedException.cs
Common/DTS.Common.Serialization/TDAS/TDAS.File.PersistentChannel.DataTooBigForArrayException.cs
Common/DTS.Common.Serialization/TDAS/TDAS.File.cs
Common/DTS.Common.Serialization/TDAS/TDAS.File.BinaryChannelHeader.cs
Common/DTS.Common.Serialization/TDAS/TDAS.File.Writer.cs
Common/DTS.Common.Serialization/TDAS/TLFBin.cs
2026-04-17T15:31:04.374981+00:00 zai-org/GLM-5-FP8 1 6096e17ba8eed1d1

TDAS File Serialization Module Documentation

1. Purpose

This module provides TDAS (Test Data Acquisition System) file serialization and deserialization capabilities for the DTS framework. It handles reading and writing TDAS-specific file formats including .tlf test files, .BIN binary channel data files, and .cchn calculated channel files. The module implements binary channel header structures with CRC validation, supports multiple sensor types including digital input modes, and provides comprehensive exception handling for file I/O operations specific to the TDAS data acquisition workflow.

2. Public Interface

DTS.Serialization.TDAS.File (partial class)

Constructor:

  • File() — Initializes a new instance with format identifier "TDAS".

Static Properties:

  • string Extension — Returns ".tlf", the file format extension.
  • string TestFileExtension — Gets/sets the test file extension (default: ".tlf").
  • string ChannelFileExtension — Gets/sets the channel file extension (default: ".BIN").
  • string CalculatedChannelFileExtension — Gets/sets the calculated channel extension (default: ".cchn").

Instance Properties:

  • IWriter<Test> Exporter — Gets the file writer instance (lazy-initialized).
  • IReader<Test> Importer — Gets the file reader instance (lazy-initialized).

Methods:

  • int GetChannelNumberFromChannelFileName(string channelFileName) — Extracts the 3-digit channel number from a channel filename by parsing before the extension.

DTS.Serialization.TDAS.File.Reader (nested partial class)

Nested Exception Types:

BadCrcException : Exception

Represents a bad CRC file event.

Constructor Description
BadCrcException() Default constructor.
BadCrcException(string msg) Initializes with message.
BadCrcException(string msg, System.Exception innerEx) Initializes with message and inner exception.

MissingFileException : Exception

Represents a missing-file event.

Constructor Description
MissingFileException() Default constructor.
MissingFileException(string msg) Initializes with message.
MissingFileException(string msg, System.Exception innerEx) Initializes with message and inner exception.

TooManyFilesException : Exception

Represents a too-many-files event.

Constructor Description
TooManyFilesException() Default constructor.
TooManyFilesException(string msg) Initializes with message.
TooManyFilesException(string msg, System.Exception innerEx) Initializes with message and inner exception.

DTS.Serialization.TDAS.File.PersistentChannel (nested partial class)

Nested Exception Types:

NotInitializedException : ApplicationException

Thrown when attempting to access a property that has not been initialized.

Constructor Description
NotInitializedException() Default constructor.
NotInitializedException(string msg) Initializes with message.
NotInitializedException(string msg, System.Exception innerEx) Initializes with message and inner exception.

DataTooBigForArrayException : ApplicationException

Thrown when attempting to convert a large dataset to an array that exceeds safe handling limits.

Constructor Description
DataTooBigForArrayException() Default constructor.
DataTooBigForArrayException(string msg) Initializes with message.
DataTooBigForArrayException(string msg, System.Exception innerEx) Initializes with message and inner exception.

DTS.Serialization.TDAS.IChannelHeader (interface)

Defines the contract for channel header data.

Property Type Description
AcquisitionRate Double Get/set acquisition rate value.
NumberOfPreT0DataPoints int Get/set number of pre-T0 data points.
NumberOfPostT0DataPoints int Get/set number of post-T0 data points.
PreZeroLevelInCnts int Get/set pre-zero level in counts.
PreCalLevelInCnts int Get/set pre-calibration level in counts.
SignalToNoiseRatioInDb Double Get/set signal-to-noise ratio in dB.
PostZeroLevelInCnts int Get/set post-zero level in counts.
PostCalLevelInCnts int Get/set post-calibration level in counts.
DataZeroLevelInCnts int Get/set data zero level in counts.
ScaleFactorMVPerCnt Double Get/set scale factor (mV per count).
ScaleFactorEUPerCnt Double Get/set scale factor (EU per count).

DTS.Serialization.TDAS.File.TDASBinaryChannelHeader (nested class)

Implements IChannelHeader and Exceptional. Represents binary channel header information.

Properties (in addition to IChannelHeader):

  • UInt32 Crc32 — Gets the CRC for the current header state.
  • UInt32 UnpaddedEuCrc32 — Gets the CRC with EU padding automatically stripped.
  • UInt32 UnpaddedEuStringPaddedEuLengthCrc32 — Gets the CRC with unpadded EU string but padded EU length.

Private Methods:

  • UInt32 CalculateCrc32(bool stripEuPadding, bool bKeepEuLength) — Calculates CRC16 for the binary channel header.

DTS.Serialization.TDAS.File.Writer (nested class)

Implements IWriter<Test>. Serializes Test objects to TDAS format.

Constructor:

  • Writer(File fileType, int encoding) — Internal constructor.

Methods:

  • void Write(string pathname, string id, Test test, bool bFiltering, bool includeGroupNameInISOExport, double minStartTime, int dataCollectionLength) — Throws NotSupportedException.
  • void Write(string pathname, string id, string dataFolder, Test test, bool bFiltering, bool includeGroupNameInISOExport, FilteredData fd, Test.Module.Channel tmChannel, int channelNumber, BeginEventHandler beginEventHandler, CancelEventHandler cancelEventHandler, EndEventHandler endEventHandler, TickEventHandler tickEventHandler, ErrorEventHandler errorEventHandler, CancelRequested cancelRequested, double minStartTime, int dataCollectionLength) — Writes the test to TDAS format files.
  • void Initialize(string pathname, string id, string dataFolder, Test test, bool bFiltering, bool includeGroupNameInISOExport, FilteredData fd, Test.Module.Channel tmChannel, int channelNumber, BeginEventHandler beginEventHandler, CancelEventHandler cancelEventHandler, EndEventHandler endEventHandler, TickEventHandler tickEventHandler, ErrorEventHandler errorEventHandler, CancelRequested cancelRequested) — Empty implementation.

DTS.Serialization.TDAS.TLFBin

Helper class for binary channel file serialization.

Constructor:

  • TLFBin(Test.Module.Channel channel, double superSampleRate) — Initializes header values from channel data.

Properties:

Property Type
AcquisitionRate double
PreTriggerDataPoints int
PostTriggerDataPoints int
PreZeroLevel int
PreCalLevel int
SignalToNoiseRatio double
PostZeroLevel int
PostCalLevel int
SuperSampleRate double

Methods:

  • void Serialize(System.IO.BinaryWriter bw, Test.Module.Channel channel) — Serializes channel data to binary format, handling digital inputs and linearization formulas.

3. Invariants

  1. Channel Number Format: Channel numbers are extracted from filenames using a fixed 3-character format (e.g., "001", "901").

  2. Squib Channel Numbering: Squib channels always start numbering at 901 and increment; regular channels start at LastChannelNumber + 1.

  3. CRC Algorithm: Binary channel headers use CRC16 with initial value 0xFFFF, processing data in 2-byte steps.

  4. Exception Pattern: All custom exceptions provide three standard constructors: parameterless, message-only, and message-with-inner-exception.

  5. File Extension Consistency: The ChannelFileExtension lookup is case-insensitive (checks both ".BIN" and ".bin").

  6. Binary Data Alignment: CRC calculation pads data to even byte count (if (data.Count % 2 > 0) data.Add(0x0)).

4. Dependencies

This Module Depends On:

  • DTS.Common.Utilities.DotNetProgrammingConstructs — Property<T> class
  • DTS.Common.Utilities — Exceptional interface
  • DTS.Common.Utils — Math_DoCRC16Step for CRC calculation
  • DTS.Common.Utilities.Logging — APILogger for error logging
  • DTS.Common.Constant — SensorConstants.BridgeType
  • DTS.Common.Enums — DigitalInputModes enum
  • DTS.Common.Enums.Sensors — Sensor-related constants
  • DTS.Serialization.Test — Test, Test.Module.Channel, Test.Module.AnalogInputChannel
  • SliceRaw.File.Reader — GetDataScaler() method
  • System.IO — BinaryWriter, StreamWriter, FileStream
  • System.Linq — Channel queries

External References (Inferred):

  • Serialization.File — Base class for File
  • IWritable<Test>, IWriter<Test>, IReader<Test> — Serialization interfaces
  • FilteredData, BeginEventHandler, CancelEventHandler, EndEventHandler, TickEventHandler, ErrorEventHandler, CancelRequested — Event/delegate types
  • TLF — TLF file format handler

5. Gotchas

  1. Unsupported Write Overload: The Write(pathname, id, test, bFiltering, ...) overload with fewer parameters throws NotSupportedException. Use the full parameter version instead.

  2. Hardcoded Post-Test Values: In TLFBin, PostZeroLevel and PostCalLevel are hardcoded to 0 with a @TODO comment indicating this information is not currently available.

  3. PreCalLevel Derivation: PreCalLevel is set to 70% of short.MaxValue (0.7D * short.MaxValue) rather than being read from actual calibration data.

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