Measurement Computing Data Acquisition Systems rev.10.4 - Manual (Page 99)

The chanCount parameter is not a configuration parameter in the same sense as the channels, gains and
flags
parameters—it simply represents the total number of channels in the scan group configuration. This
number also represents the number of entries in each of the channels, gains and flags arrays.
To illustrate how the scan group might be configured, suppose that we would like to configure a scan sequence
in the following order:
Scan Location 0 --- an analog, bipolar, and single-ended channel with gain x 1, using channel 3
Scan Location 1 --- a 16-bit HS digital channel on P3
Scan Location 2 --- the lower 16-bits on counter 0 used (with scan location 3) as a cascaded 32-bit
counter for totalizing
Scan Location 3 --- the upper 16-bits on counter 2 used (with scan location 2) as a cascaded 32-bit
counter for totalizing
The following table shows how an array with the above specifications might be defined. Note that, in this
example, there are 4 channel scan locations (chanCount=4) rather than 3 since the 32-bit cascaded counter
occupies two scan locations.
Array
Location
Scan
Location
channels
Array Elements
gains
Array Elements
flags
Array Elements
0 0 channels(0) = 3 gains(0) = DgainX1 flags(0) =
DafAnalog + DafBipolar +
DafSingleEnded
1 1 channels(1) = 0 gains(1) = N/A flags(1) = DafP3Local16
2 2 channels(2) = 0 gains(2) = N/A flags(2) =
DafCtr32Low + DafCtrTotalize
3 3 channels(3) = 2 gains(3) = N/A flags(3) =
DafCtr32High +
DafCtrTotalize
Programmer’s Manual 908594 Daq API Command Reference 4.2-43