Hello, I'm trying to control solenoid operated pinch valves through a computer. The valves I'm using are from Cole Parmer: http://www.coleparmer.com/catalog/product_view.asp?sku=9830206 The Control of the solenoid pinch valves is using digital output pins from a DAQ card. The digital output should be directly connected to the TTL input of the valves. The valve should open when the digital output is set high (5V) and close when the digital output is set low (0V). Since the valves I'm using are not TTL, I will need to use a TTL switch with the valves. I'm thinking of using this switch from Texas Instruments: http://www.ti.com/product/CD74HCT4316/technicaldocuments I'm confused about the switch part and the control. I hope you guys can help.