Power-On state of digital outputs in 6713 card

[testEng]

The card manual says Power-on state of DIO is Input(high-Z). However after I power up the computer before I ryn my software, I measure DIO outputs as high TTL voltage(about +5V). Similar situation happens with GPCTR0_OUT which I use for a pulse train. Again before any configuration when I expect low TTL output, the high level comes up. When I run my software I have all this configured properly. But this unexpected power-on status does not look right , also it is not compatible with my external hardware and makes it possible damage.

[JoshuaP]

The default state for the DIO and counter out lines is a internal 50 kOhm resistor pulled up to 5V. This is listed in the user manuals. However, you can change the default state of any of these lines by adding a external pull-down resistor. Here is a KB that discusses this in more detail.

http://digital.ni.com/public.nsf/websearch/008995633E33E47486256B5F00034436?OpenDocument

I hope this helps.

Joshua