problem with / s digital correlated on USB-6341

I'm testing an application that fact/s digital correlated, written in C++ with a USB-6341. I use NEITHER-DAQmx version 16.0.0f0.

Because this application will be used by people with a variety of different DAQ hardware, I tried to write it to manage a lot of contingencies. Then when I put in place a DIO task correlated for the release, I'm trying to determine the width of the channel:

uInt32 dataBytes;

If (NIerror = DAQmxGetWriteRawDataWidth (h, & dataBytes))

On my USB-6341 dataBytes returns 1, so I try to write data using DAQmxWriteDigitalU8(), but which returns an error saying:

device USB6341:-200565: specified the digital channel contains more bits than supported by the 8-bit version of DAQmx Port write.

Use the version of DAQmx Port write who takes in charge the broader digital ports.

If I remove the test and force it to use DAQmxWriteDigitalU32(), then it works.

I'm afraid that if I try to always use DAQmxWriteDigitalU32() I may be wrong with other devices that do not support 32-bit channels.

Is this a bug in NOR-DAQmx associated with USB-6341? Have I misunderstood something about how it works?

John,

It seems that it is a known issue with DAQmx and a corrective action request was filed for this problem. For now, using the DAQmxWriteDigitalU32 should work fine if the device has ports 8-bit or 32-bit.

Tags: NI Hardware

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