Measurement Computing TempBook rev.3.0 - Manual (Page 135)

TempBook User’s Manual daqCommand Reference (Enhanced API) 11-11
daqAdcSetDataFormat
DLL Function daqAdcSetDataFormat ( DaqHandleT handle, DaqAdcRawDataFormatT rawFormat,
DaqAdcPostProcDataFormatT postProcFormat );
C daqAdcSetDataFormat(DaqHandleT handle, DaqAdcRawDataFormatT rawFormat,
DaqAdcPostProcDataFormatT postProcFormat );
Visual BASIC VBdaqAdcSetDataFormat &(ByVal handle&, ByVal rawFormat&, ByVal postProcFormat&)
Delphi daqAdcSetDataFormat(Handle:DaqHandleT; rawFormat:DaqAdcRawDataFormatT rawFormat;
postProcFormat:DaqAdcPostProcDataFormatT);
Parameters
handle The handle to the device for which to set the option
rawFormat The channel number on the device for which the option is to be set
postProcFormat Flags specifying the options to use
Returns DerrNoError - No error (also, refer to API Error Codes on page 11-39)
See Also daqCvtRawDataFormat,daqCvtRawDataFormat
Program References None
Used With All devices
daqAdcSetDataFormat allows the setting of the raw and the post-acquisition data formats
which will be returned by the acquisition transfer functions. Note: Certain devices may be limited to
the types of raw and post-acquisition data formats which can be presented.
The rawFormat parameter indicates how the raw data format is to be presented. Normally, the
raw-data format represents the data from the A/D converter. The default value for this parameter is
DardfNative
where the raw-data format follows the native-data format of the A/D for the
particular device. An optional parameter is DardfPacked where raw A/D values are compressed
to make full use of all unused bits for any native format that leaves unused bits in the byte-aligned
count value. For instance, a 12-bit raw A/D value (which would normally be represented in a 16-bit
word, 2-byte count value) will be compressed so that 4 12-bit A/D raw counts can be represented in
3 16-bit word count values. The TempBook/66 supports this packed format (used with the generic
functions of the form daqAdcTransfer…).
The postProcFormat parameter specifies the format for which post-acquisition data will be
presented. This format is used by the one-step functions of the form daqAdcRd…. The default
value is DappdfRaw where the post-acquisition data format will follow the rawFormat
parameter.