:WAVeform Commands 34
Keysight InfiniiVision 3000T X-Series Oscilloscopes Programmer's Guide 1095
WORD format (see ":WAVeform:FORMat" on page 1101) provides 16-bit
access to the waveform data. In the WORD format, the number of data bytes is
twice the number of data points. The number of data points is the value
returned by the :WAVeform:POINts? query (see page 1102). If the data
intrinsically has less than 16 bits of resolution, the data is left-shifted to provide
16 bits of resolution and the least significant bits are set to 0. Currently, the
greatest intrinsic resolution of any data is 12 bits, so at least the lowest 4 bits of
data will be 0. If there is a hole in the data, the hole is represented by a 16 bit
value equal to 0.
Use :WAVeform:BYTeorder (see page 1097) to determine if the least significant
byte or most significant byte is to be transferred first. The :BYTeorder command
can be used to alter the transmit sequence to match the storage sequence of
an integer in the programming language being used.
Data Format for Transfer - BYTE format
The BYTE format (see ":WAVeform:FORMat" on page 1101 ) allows 8-bit
access to the waveform data. If the data intrinsically has more than 8 bits of
resolution (averaged data), the data is right-shifted (truncated) to fit into 8 bits.
If there is a hole in the data, the hole is represented by a value of 0. The
BYTE-formatted data transfers over the programming interface faster than
ASCii or WORD-formatted data, because in ASCii format, as many as 13 bytes
per point are transferred, in BYTE format one byte per point is transferred, and
in WORD format two bytes per point are transferred.
The :WAVeform:BYTeorder command (see page 1097) has no effect when the
data format is BYTE.
Digital Channel Data (MSO models only)
The waveform record for digital channels is similar to that of analog channels. The
main difference is that the data points represent either DIGital0,..,7 (POD1),
DIGital8,..,15 (POD2), or any grouping of digital channels (BUS1 or BUS2).
For digital channels, :WAVeform:UNSigned (see page 1117) must be set to ON.
Digital Channel POD Data Format
Data for digital channels is only available in groups of 8 bits (Pod1 = D0 - D7, Pod2
= D8 - D15). The bytes are organized as:
:WAVeform:SOURce Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
POD1 D7 D6 D5 D4 D3 D2 D1 D0
POD2 D15 D14 D13 D12 D11 D10 D9 D8
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