Measurement Computing TempBook rev.3.0 - Manual (Page 131)

TempBook User’s Manual daqCommand Reference (Enhanced API) 11-7
daqAdcRdN
DLL Function daqAdcRdN(DaqHandleT handle, DWORD chan, PWORD buf, DWORD scanCount,
DaqAdcTriggerSource triggerSource, BOOL rising, WORD level, FLOAT freq,
DaqAdcGain gain, DWORD flags);
C daqAdcRdN(DaqHandleT handle, DWORD chan, PWORD buf, DWORD scanCount,
DaqAdcTriggerSource triggerSource, BOOL rising, WORD level, FLOAT freq,
DaqAdcGain gain, DWORD flags);
Visual BASIC VBdaqAdcRdN&(ByVal handle&, ByVal chan&, buf%(), ByVal scanCount&, ByVal
triggerSource&, ByVal rising&, ByVal level%, ByVal freq!, ByVal gain&, ByVal
flags&)
Delphi daqAdcRdN(handle:DaqHandleT; chan:DWORD; buf:PWORD; scanCount:DWORD;
triggerSource:DaqAdcTriggerSource; rising:longbool; level:WORD; freq:single;
const gain:DaqAdcGain; flags:DWORD)
Parameters
handle Handle to the device for which the ADC channel samples are to be acquired
chan A single channel number
buf An array where the A/D scans will be returned
scanCount The number of scans to be taken
Valid values:
1 - 32767
triggerSource The trigger source
rising Boolean flag to indicate the rising or falling edge for the trigger source
level The trigger level if an analog trigger is specified
Valid values:
0 -4095
freq The sampling frequency in Hz ( 100000.0 to 0.0002 )
gain The channel gain
flags Channel configuration flags in the form of a bit mask
Returns DerrFIFOFull - Buffer overrun
DerrInvGain -Invalid gain
DerrIncChan - Invalid channel
DerrInvTrigSource - Invalid trigger
DerrInvLevel - Invalid level (also, refer to API Error Codes on page 11-39)
See Also daqAdcSetFreq, daqAdcSetMux, daqAdcSetClock, daqAdcSetTrig
Program References None
Used With All devices
daqAdcRdN is used to take multiple scans from a single A/D channel. This function will:
•
Configure the pacer clock
•
Configure all channels with the specified gain parameter
•
Configure all channel options with the channel flags specified
•
Arm the trigger
•
Acquire count scans from the specified A/D channel
See ADC Flags Definition table (in ADC Miscellaneous Definitions) for channel flags
parameter definition.