NI6503 out of initial States


I have a little problem with a NI6503. For my furniture, I set 16 inputs to control certain components and 8 outputs. At the opening of my software (C++)

He defined each row with the next step:

output for port0

DAQmxCreateTask 'PiLj.

DAQmxCreateDOChan (hTask, "boardname\port0\linej","", DAQmx_Val_ChanPerLine);

DAQmxStartTask (hTask);

entry to the port 1 and 2

DAQmxCreateTask 'PiLj.

DAQmxCreateDIChan (hTask, "boradname\port1and2\linej","", DAQmx_Val_ChanPerLine);

DAQmxStartTask (hTask);

At the end of initialization, if all set to FALSE exit with a function writeline (OFF so light outside):

Data [0] = value? 0:1;


After that, I can change the status of each line according to the logic of program control sequencer. I also have

a function readline to retrieve the component entry status: it all works perfectly!

But, to the output line, the problem is that in between DAQmxStartTask and DAQmxWriteDigitalLines's initialization stage, the led is on.

In debug mode, I saw clearly, it is DAQmxStartTask that allow the light and then the LIGHT is (howerver, jumper W1 on board is set to LOW)

When the computer is started without a problem, it's only the software from: he observed a kind of flashing light. Similarly, it is for a short time)<>

I'm afraid that might set off my equipment (it is difficult to verify that).

This phenomenon appears only after the restart computer and software starting. If I quit the program and restart it without a problem!

How can I do to solve my problem?

Thanks for your helpful answer!



Hi Sylvain,.

Thanks for posting on this forum.

When the 6503 is configured for output, it generates a low state of 5ms. Unfortunately, we will not be able to change that because it is the behavior of the chip.

However, if you select the power until the State of bass with the switch, you will stay low, and therefore, you will not have a glitch.

If necessary, I suggest you use an inverter to invert the logic and avoid this glitch.

Best regards

Tags: NI Hardware

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