Measurement-computing Data Acquisition Systems rev.10.4 Uživatelský manuál stáhnout pdf (Strana 325)

Programmer’s Manual 908594 Daq API Command Reference 4.7-7

API Error Codes (Cont.) – daqError

Error Name Code # hex - dec Description

DerrFileOpenError 67h - 103

Cannot open the specified file – the file specified by the filename parameter in the

daqAdcSetDiskFile or the daqDacWaveSetDiskFile APIs could not be opened.

Corrective Actions:

• Make sure that the file name and path have been properly defined in the

filename string parameter.

• Make sure that the application has the appropriate system permissions to

read/open the file. This can be an issue, especially under Windows/NT/2000

systems.

DerrFileWriteError 68h - 104

Unable to write file. The file specified by the daqAdcSetDiskFile API command

could not be written or pre-written.

Corrective Actions:

• Check that the application has called daqAdcSetDiskFile API prior to arming

the acquisition (daqAdcArm).

• Check the return codes from daqAdcSetDiskFile API to ensure that the file

was opened properly.

• Make sure that the application has the appropriate system permissions to

write the file. This can be an issue, especially under Windows/NT/2000

systems.

• Lack of adequate space on the target drive could cause a failure to write

acquired data during the acquisition or the pre-write operation (if requested).

Make sure that there is enough space on the target drive and path to write the

entirety of the acquisition.

DerrFileReadError 69h - 105

Unable to read file. The file specified by the daqDacWaveSetDiskFile API command

could not be read.

Corrective Actions:

• Check that the application has called daqDacWaveSetDiskFile API prior to

arming waveform output (daqDacWaveArm).

• Check the return codes from daqDacWaveSetDiskFile API to ensure that the

file was opened properly.

• Make sure that the application has the appropriate system permissions to read

the file. This can be an issue, especially under Windows/NT/2000 systems.

DerrInvClockSource 6Ah - 106

Invalid clock source selected – The clock source for the input or output operation is

not properly set for the device. The clockSource parameter (set in the

daqAdcSetClockSource or daqDacWaveSetClockSource APIs is not set to a valid

clock source for the given device.

Corrective Actions:

• If performing a clocked input operation with daqAdcSetClockSource make sure

that the clockSource selected is a valid clock source type

(DaqAdcClockSource) for the given device.

• If performing a clocked output operation with daqDacWaveSetClockSource

make sure that the clockSource selected is a valid clock source type

(DaqDacClockSource) for the given device.

DerrInvEvent 6Bh - 107

Invalid transfer event. The events specified by the events parameter in the

daqWaitForEvents or daqWaitForEvent API’s was not a valid transfer event type

(DaqTransferEvent).

Corrective Action:

Check the events parameter to ensure that it is a valid DaqTransferEvent event

type.

DerrTimeout 6Ch - 108

Time-out on wait – The wait on a single event or wait on multiple events timed-out.

The event(s) specified by the daqWaitForEvents or daqWaitForEvent API’s did not

occur before the time-out for the events expired. The time-out for the event(s) is set

via the daqSetTimeout API and is based in ms.

Corrective Actions:

• If the event(s) are expected to occur within a given finite period that can be

determined then use the daqSetTimeout API to set the maximum time to wait

for the event(s) to occur.

• If the event(s) cannot be guaranteed to occur within a finite period then set the

time-out to be infinite by setting the parameter mSecTimeout=0 in the

daqSetTimeout API.

DerrInitFailure 6Dh - 109

Unexpected result occurred while initializing the hardware. This error is a general

failure indicating that the driver cannot properly communicate and/or initialize the

device.

Corrective Action:

Follow the procedures set forth in DerrNotOnline error code for your particular

device to make sure that the device is properly powered, connected and

configured.

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