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A-14 API Custom Program Modules Appendix A, 878495 Personal Daq User’s Manual

Summary Guide of Selected API Functions

Simple One-Step Routines

For single gain, consecutive channel, foreground transfers, use the following functions:

Foreground Operation Single Scan Multiple Scans

Single Channel

daqAdcRd daqAdcRdN

Consecutive Multiple Channels

daqAdcRdScan daqAdcRdScanN

Complex A/D Scan Group Configuration Routines

For non-consecutive channels, high-speed digital channels, multiple gain settings, or multiple polarity settings, use the SetScan

functions.

daqAdcSetScan

Set scan sequence using arrays of channel and gain values.

daqAdcSetMux

Set a contiguous scan sequence using single gain, polarity and channel flag values

Trigger Options

After the scan is set, the trigger needs to be set. If a software trigger is selected, the start time of the scan depends on the

application calling daAdcSoftTrig.

DaqAdcSetTrigEnhanced Configures the device for enhanced triggering.

Multiple Scan Timing

If the acquisition is to have multiple scans and the trigger mode is one-shot, the pacer clock needs to be set with one of the

following functions:

daqAdcSetRate

Set/Get the specified frequency or period for the specified mode.

daqAdcSetFreq

Set the pacer clock to the given frequency.

A/D Acquisition

A/D acquisition settings are not active until the acquisition is armed.

daqAdcArm

Arm an A/D acquisition using the current configuration. If the trigger source was set to be immediate,

the acquisition will be triggered immediately.

daqAdcDisarm

Disarm the current acquisition if one is active. This command will disarm the current acquisition and

terminate any current A/D transfers.

daqAdcSetAcq

Define the mode of the acquisition and set the pre-trigger and post-trigger acquisition counts, if

applicable.

daqAdcAcqGetStat

Return the current state of the acquisition as well as the total number of scans transferred thus far as

well as the trigger scan position, if applicable.

A/D Data Transfer

After the acquisition is started, the data needs to be transferred to the application buffer. Three routines are used:

DaqAdcTransferSetBuffer

Configure a buffer for A/D transfer. Allows configuration of the buffer for block and single reading

update modes as well as linear and circular buffer definitions.

DaqAdcTransferStart

Start a transfer from the Personal Daq device to the buffer specified in the

daqAdcTransferSetBuffer command

DaqAdcTransferStop

Stop a transfer from the Personal Daq device to the buffer specified in the

daqAdcTransferSetBuffer command

To find out whether a background A/D transfer is complete or to stop transfers, use the following function:

DaqAdcTransferGetStat

Return current A/D transfer status as well as a count representing the total number of transferred

scans or the number of scans available.

Digital Functions ( Does not apply to Personal Daq/54 )

After the digital group is configured, the ports can be read or written a byte at a time. Note that “low/high” and “digital I/O” are

accessed a nibble at a time. A single bit of a digital channel can be read or written using the following routines:

daqIOReadBit

Return indicated bit from selected channel.

daqIOWriteBit

Send indicated bit to selected channel.

1 2 ... 127 128 129 130 131 132 133 134 135 136 137 ... 169 170

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