Hi Dave,
If the pump is hooked up via serial, then you should be able to issue serial commands to the device. The appropriate serial commands are most likely located in your device manual. Once you obtain those commands, I would suggest taking a look at our basic serial read/write example, which can be found in the NI Example Finder. That should provide a good base for you to start from.
Let us know if you have any questions.
Regards,
Kevin H
National Instruments
WSN/Wireless DAQ Product Support Engineer