Hi, in pci-6013 card, DIO state is pulled down by putting a resistor of 1.5 Kohm between DIO & DGND. If you connect 1.5K resistor between Vcc & DIO, you will get 2.5V approx.
Further to increase voltage at this DIO, you have to reduce the value of this resistor. Lets say, if you connect a resistor of 150 ohm between Vcc & DIO, you will get (10/11)x5V which is near to 4.5 V which is surely TTL high signal. So you can connect any value between 150 ohm to 1.5 Kohm to get high TTL logic at DIO. Hope it works. Your feedbacks are welcome. Best Regards, Nirmal
