Measurement Computing Data Acquisition Systems rev.10.4 - Manual (Page 74)

daqAdcRdScanN
Also See: daqAdcSetMux, daqAdcSetClockSource, daqAdcSetTrig, daqAdcRdN
Format
daqAdcRdScanN(handle, startChan, endChan, buf, scanCount, triggerSource,
rising, level, freq, gain, flags)
Purpose
daqAdcRdScanN reads multiple scans from a set of consecutive acquisition channels.
Parameter Summary
Parameter Type Description
handle DaqHandleT Handle to the device from which acquisition scans
will be acquired
startChan DWORD The starting channel of the scan group
endChan DWORD The ending channel of the scan group
buf PWORD An array into which the acquisition scans will be
placed
scanCount DWORD The number of scans to be read
triggerSource DaqAdcTriggerSource The trigger source
rising BOOL
Boolean flag to indicate the rising or falling edge for
the trigger source
level WORD The trigger level if an analog trigger is specified
freq FLOAT The sampling frequency in Hz
gain DaqAdcGain The channel’s gain setting
flags DWORD
Channel configuration flags in the form of a bit mask.
Parameter Values
handle: obtained from the daqOpen function
startChan: must be a valid channel number for the device
endChan: must be a valid channel number for the device and greater than startChan
buf: must be a valid pointer to memory whose size is at least equal to:
[(endChan – startChan) * scanCount * (the sample size, normally 2 bytes) ]
scanCount:
valid values range from 1 to 4,294,967,295 scans; however, memory limitations apply.
triggerSource: see table below
rising: valid values are either true (
≠ 0) or false ( = 0)
level: valid values range from 0 to 65,535, representing the trigger level in unsigned A/D counts
freq: see the daqAdcSetRate function for details
gain: s ee ADC Gain Definition table for gain parameter values
flags: see ADC Flag Definition table for flags parameter values
Parameter Type Definitions
triggerSource-DaqAdcTriggerSource
Definition Description
DatsImmediate Begins taking post trigger scans immediately upon daqAdcArm function
DatsAdcClock Begins taking post trigger scans upon detection of next pacer clock pulse
DatsGatedAdcClock Begins taking post trigger scans upon detection of next gated pacer clock pulse
DatsExternalTTL Begins taking post trigger scans on the selectable edge of an external TTL signal on pin
25 of P1
DatsHardwareAnalog Begins taking post trigger scans upon a selectable criteria of the input signal (above
level, below level, rising edge, etc.)
4.2-18 Daq API Command Reference 988594 Programmer’s Manual