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I need to output 20+ volts using a PCI-6704 card. Since each AO can only provide up to 10 volts, can I cascade some AO channels to get the voltage I need?
No, you can not cascade the outputs of your PCI-6704 card. The outputs are not isolated from one another or from the chassis ground, so you would effectively be shorting your PC ground to a 10V output (bad idea). Since the PCI-6704 is a static update module, depending on the channel count and form factor requirements you may be able to use the PXI-4110. Otherwise, you will need to add some external amplification to achieve outputs greater than 10V.