Driving 7 segment LEDs using cRIO

[GoodManBing]

Hi,

I am using cRIO-9101 and I have an analog output module, cRIO-9263. May I know if it is possible to drive a 7 segment LED (which is used as a counter) using the analog output module? Or do I need to get a digital output module such as the cRIO-9474? Also, are the outputs of the digital module based on TTL(transistor to transistor) logic? The chips which I am provided uses TTL to count up/down.

Many thanks!

-Bing

[Prashanth]

Hi Bing,

I would not recommend using an analog output module to act as a digital output module. Below is an excerpt from the c-RIO 9474 Operating Instructions manual and it sheds more light on the connectivity specification.

"The cRIO-9472/9474 has current sourcing outputs, meaning the DO terminal or pin drives current or applies voltage to the device to which it is connected. You can connect sinking-input devices, such as NPN, open collectors, normally high, IEC negative logic, or other DC devices to the cRIO-9472/9474. A sinking-input device provides a path to ground for current or voltage. Make sure the device you connect to the cRIO-9472/9474 meets the module specifications. Refer to the Specifications section for more information about the output specifications of the module."

Here is a link to the c-RIO 9474 Operating Instructions manual http://digital.ni.com/manuals.nsf/websearch/BAF8D048C34851BC86256F0F00652B7F

Regards,
Prashanth

[GoodManBing]

Thank you Prashanth for your advice.