Using the NI USB-6501 DAQ POD to Control Digital I/O

Hello,

I have a project I am working on where I will need to be controlling four separate DC power supplies using a series of programable electrical relays to be able to power on and off my UUT using the USB-6501 DAQ Pod.  I have the code to be able to send commands to the supplies to set, power/off the supplies, but have never used the NI DAQ Pods before (specifically the NI USB-6501 24 channel I/O Pod).  I am unfamiliar with how to also talk to the relays themselves using this pod and would appreciate some guidance and tips on how to go about setting this up.  I have been perusing through some of the manuals and examples, but none really are able to capture what I need.  Any help is appreciated!

Thanks!