Measurement Computing Data Acquisition Systems rev.10.4 - Manual (Page 13)

Programmer’s Manual 988594 API Programming, General Models 2-3
Here we are only configuring channels on the main unit. If configuring DBK expansion options
each DBK channel needs to be programmed into the channel scan sequence. You may also
need to set more specific channel configuration options. For this, refer to the sections
regarding your specific DBK expansion card.
The following shows how to program the channel scan sequence.
DaqAdcGain gains[CHANCOUNT] = {DgainX1, DgainX2, DgainX8, DgainX4};
DWORD channels[CHANCOUNT] = {0,1,2,3};
DWORD flags[CHANCOUNT] = {DafAnalog|DafBipolar,DafAnalog|DafUnipolar,
DafAnalog|DafBipolar, DafAnalog|DafUnipolar};
err = daqAdcSetScan(handle, channels, gains, flags,CHANCOUNT);
Related API’s* Description
DaqAdcSetScan Performs basic channel scan sequence configuration, sets up
channel scan information
DaqAdcSetMux Same as daqAdcSetScan but sets all channels to the same
configuration parameters
DaqAdcSetOption Used to configure more complex configuration options for
individual channels
DaqAdcExpSetBank Used to setup channel banks/blocks for use with DBK
expansion
*See the API Command Reference chapter for detailed information.
2. Configure Acquisition Events – How Should the Acquisition Start and Stop?
In this section we describe how to configure the Starting and Stopping Events for your
acquisition. Each acquisition needs to have well defined Start and Stop Events. A Start Event
can be as simple as start the acquisition immediately upon arming. An acquisition Stop Event
can be as simple as Stop upon disarming the acquisition. The number and type of start and
stop events is dependent upon the capabilities of the data acquisition device and vary from
product to product. Acquisitions may also be defined with pre-trigger data. The amount of
pre-trigger data can vary.
err = daqAdcSetAcq(handle, DaamNShot, 0,SCANS);
err = daqSetTriggerEvent(handle,DatsSoftware, NULL,NULL,NULL,NULL,NULL,
DaqStartEvent);
err = daqSetTriggerEvent(handle,DatsScanCount,NULL,NULL,
NULL,NULL,NULL,NULL, DaqStopEvent);
Related API’s* Description
daqAdcSetAcq Configures acquisition modes as well as pre and post trigger
scan counts
daqSetTriggerEvent Configures Start/Stop Trigger Events.
daqAdcSetTrig Used to configure Start Trigger Event
daqAdcCalcTrig Used to calculate Analog level in A/D counts for use in
daqAdcSetTrig
*See the API Command Reference chapter for detailed information.