Datalogic PowerScan Area Imager Quick Reference Manual page 16

Configuring the Interface
KEYBOARD
USB Keyboard with standard key encoding
Select USB Keyboard
USB Keyboard with alternate key encoding
Select USB Alternate Keyboard
USB Composite
★ Select USB-Composite
AT, PS/2 with standard key encoding
Select KBD-AT
AT, PS/2 with alternate key encoding
Select KBD-AT-ALT
★ Factory setting
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POWERSCAN™ PM96XX