LVS-7500 External System Installation and Quick Start Guide 3. Connect the External I/O Cable to the printer. 4. If desired, reference the External I/O Wiring Diagram for external I/O wiring instructions. 5. Plug one end of the USB cable into the USB connector on the SMU and the other end into the computer’s USB port. LVS-7500 External System Installation and Quick Start Guide Page 39 of 45