Dell 1125 Mono Laser MFP User Manual page 94

NOTE: The installation does not continue until the USB connection is detected. If the printer is not detected, the installation remains idle and the
following screen displays.
8. Turn on the printer and connect it to the computer's USB port.
The Found New Hardware Wizard displays.
9. Select Install software automatically (Recommended) and Click Next.
The Scanner, Fax, Status Monitor, MFP Utility, Paper Port, and Printer drivers are installed at this time.
Installation continues and the Congratulations, Setup Complete screen displays.