Datalogic QuickScan I QD21 1 Series Product Reference Manual page 15

Setting Up the Reader
connector into the socket on the RS-232 cable connector and the AC Adapter
plug into a standard power outlet.
Connect the reader to a USB port on the terminal/PC using the
USB Connection:
correct USB cable for the interface type you ordered.
The Keyboard Wedge cable has a 'Y' connection
Keyboard Wedge Connection :
from the reader. Connect the female to the male end from the keyboard and the
remaining end at the keyboard port at the terminal/PC.
Figure 2. Connection Types
USB
Keyboard Wedge
RS-232
Specific cables are required for connection to different hosts. The connectors illustrated
above are examples only. Actual connectors may vary from those illustrated, but the steps
to connect the reader remain the same.
NOTE
Product Reference Guide 5