Appendix
The data types are shown below.
Module/Data Type Bit Count Value Type VDataType
2ch module, SCAN, temperature SCAN, Math, RMath − IS2
LOGIC − B16
CAN, CAN/LIN
2 to16 Unsign IU2
2 to16 Sign IS2
17 to 32 Unsign IU4
17 to 32 Sign IS4
− Float IS2
1 to 8 Logic B16
Bit data is stored in 16 bits. The bits are arranged in order from the least significant bit (bit 1 to bit 8), and the
highest 8 bits are not used.
Waveform Data
Waveform data begins DataOffset bytes into the file
1
.
Data is arranged in order by trace. The number of data points is indicated by BlockSize of each trace in the
waveform analysis information. The data size of each point is indicated by VDataType.
Due to different sampling rates on the measurement module, the number of data points may vary for each trace.
For waveform data saved using the “history all” feature, the da
ta of all history entries is stored for each trace.
The history entries are arranged in order from the oldest to the most recent. The number of stored history
entries can be verified by BlockNumber in the waveform analysis information.
:
:
Trace -1
Trace -2
Trace -3
Trace -4
Trace -1
Trace -1
Trace -1
Trace -2
Trace -2
Trace -2
History –n
History –1
History –0
History –n
History –1
History –0
Data example saved
using “history all”
Data example saved for
one history entry
1 “DrAW” chunks hold waveform data (“dsRW” chunks hold dual capture waveforms).
A “DrAW” chunk contains “the data size in chunk” followed by the file data size (4 bytes) and file number (4
bytes). DataOffset points to the head of the raw data, which comes after these pieces of data.
In the
case of a “dsRW” chunk (used in dual capturing), the head of the raw data comes immediately after “the
data size in chunk,” and thus DataOffset (DHDR) also points to this position.
StartOffset
Sub channel data may not begin from the first point of the main channel data.
In such a case, it begins after the “start offset” of the main channel data.
Normally, this information does not need to be considered.
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