The ultimate in interface flexibility:
As your needs grow or change, you can easily add more analog inputs, analog outputs, or digital I/O by installing an option card.
You can install one option card in HD I/O 8x8x8 and up to two in HD I/O 16x16 Digital. While HD I/O 16x16 Analog comes with the maximum four cards, you can customize your I/O by swapping out any card.
HD I/O AD OptionHD I/O AD Option: Adds 8 high-fidelity analog inputs (using DB25)