Measurement Computing Personal Daq rev.6.0 - Manual (Page 144)

B-12 API Commands Appendix B, 887095 Personal Daq User’s Manual
daqAdcSetMux
DLL Function daqAdcSetMux(DaqHandleT handle, DWORD startChan, DWORD endChan, daqAdcGain gain,
DWORD flags);
C daqAdcSetMux(DaqHandleT handle, DWORD startChan, DWORD endChan, DaqAdcGain gain,
DWORD flags);
Visual BASIC VbdaqAdcSetMux&(ByVal handle&, ByVal startChan&, ByVal endChan&, ByVal gain&, ByVal
flags&)
Delphi daqAdcSetMux(handle:DaqHandleT; startChan:DWORD; endChan:DWORD; const
gain:daqAdcGain; flags:DWORD)
Handle Handle to the device for which to configure the ADC channel scan group
StartChan The starting channel of the scan group
EndChan
The ending channel of the scan group
Gain The gain value for all channels
Parameters
Flags Channel configuration flags in the form of a bit mask
DerrInvGain Invalid gain
DerrIncChan Invalid channel
Returns
DerrNoError No error
See Also daqAdcSetScan, daqAdcGetScan
Program References None
Used With All devices
Description
daqAdcSetMux sets a simple scan sequence of local A/D channels from startChan to endChan with the specified gain value. This
command provides a simple alternative to daqAdcSetScan if only consecutive channels need to be acquired. The flags parameter is
used to set channel dependent options. See ADC Flags Definition table for channel flags definitions.
daqAdcSetRate
DLL Function daqAdcSetRate(DaqHandleT handle, daqAdcRateMode mode, daqAdcAcqState acqState, FLOAT
reqRate, PFLOAT actualRate);
C daqAdcSetRate(DaqHandleT handle, DaqAdcRateMode mode, DaqAdcAcqState acqState, FLOAT
reqRate, PFLOAT actualRate);
Visual BASIC VBdaqAdcSetRate(ByVal handle&, ByVal mode&, ByVal acqState&, ByVal reqRate!,
actualRate!);
Delphi daqAdcSetRate(handle:DaqHandleT; mode:daqAdcRateMode; state:daqAdcAcqState;
reqValue:single; actualValue:PSINGLE);
handle Handle to the device for which to set ADC scanning frequency.
mode Specifies the rate mode (frequency or period).
acqState Specifies the acquisition state to which the rate is to be applied.
reqRate Specifies the requested rate.
Parameters
actualRate Returns the actual rate applied. This may be different from the requested rate.
Returns DerrNoError No error
See Also daqAdcSetAcq, daqAdcSetTrig, daqAdcArm, daqAdcSetFreq, daqAdcGetFreq
Program References DAQEX.PAS (Delphi), ADCEX1.C, FREQEX1.C, PULSEEX1.C, MULTEX1.C, DAQEX.FRM (VB)
Used With All devices
Description
daqAdcSetRate configures the scan rate using the rate mode specified by the mode parameter. Currently, the valid modes are:
•
DarmPeriod - Defines the requested rate to be in periods/sec.
•
DarmFrequency - Defines the requested rate to be a frequency. This function will set the acquisition rate requested by the
reqRate parameter for the acquisition state specified by the acqState parameter.
Currently, the following acquisition states are valid:
•
DaasPreTrig - Sets the pre-trigger acquisition rate to the requested rate.
•
DaasPostTrig - Sets the post-trigger acquisition rate to the requested rate.
Personal Daq does not allow a pre-trigger rate different from the post-trigger rate. Therefore, the pre-trigger rate settings will be ignored
and the post-trigger rate will be used for both the pre-trigger and the post-trigger scan rates.
If the requested rate is unattainable on the specified device, a rate will be automatically adjusted to the device’s closest attainable rate. If
this occurs, the actualRate parameter will return the actual rate for which the device has been programmed.