ADLINK PCI-9524 - Manual (Page 78)

62 Operation Theory
PCI-9524 ADLINK Technology Inc.
User’s Manual Copyright 2008
Bypassing the API's internal software calibrating mechanism may,
however, invalidate the specified absolute accuracy.
The 'Channel No.' ranges from 0 to 3, indicating which of the input
channels of that analog input group is converted during auto-scan
mode. This represents channels 0 to 3 for transducer input chan-
nels, and channels 4 to 7 for general purpose input channels. If
auto-scan is disabled, the Channel No. will remain at zero.
The 'RSV' field is reversed.
The 'DSP Flushed' field denotes whether the current AD Data is a
large input step that has been recognized, and validated to flush
the post-processing IIR digital filter contents.
The 'Data Refreshed' bit is valid only in Fast-polling Data Transfer
mode (see Section 4.2.12 for Data Transfer Modes), a '1' indicates
that the AD data for that specific channel has been updated, and it
is the first time it is being read.
4.2.11 AD Data Format
The data format of the acquired 24-bit AD data is in 2's Comple-
ment coding. Table 4-5 illustrates valid input ranges and the ideal
transfer characteristics for transducer input channels, i.e. analog
input channels 0 to 3.