DIO control (6602-2121) via matlab

[GT]

Hello,

I would like to use matlab to trigger a TTL via the NI-6602 (and BNC 2121 accessory).

My code:

dio=digitalio('nidaq',2);

hwlines=addline(dio,0,'out');

data=1;

putvalue(dio,data);

start(dio);

getvalue(dio)

I'm having two problems:

1) The output does not look like a square wave on a scope.

2) I can't use the same line (zero in the above code) to send the output twice in a row. I have to keep switching it between line 0 and one for it to work consecutively.

Can anyone advise?

May thanks in advance,

Gene

[AlanArmstead]

Hello Gene,

I'm not familiar with the Matlab syntax, but it looks like you are doing static digital output, and expecting to see a square wave.  With static digital, when you write one value to a digital line, it will stay at that value until you write a different value to it.  Beyond that, I'm afraid I can't help with with the syntax.....you might have to probe Matlab support for that.  I can tell you that this stuff is extremely easy with LabVIEW, and there are bunches of people on these forums that can help with LabVIEW programming.

-Alan A.