Citizen CT-S310II User Manual page 18

Rear connectors
AC inlet
USB cable clamp
Interface connector (USB, serial)
Cash drawer kick-out connector
Interface connector (USB, serial)
Connects to the interface cable (USB, serial).
Cash drawer kick-out connector
Connects to the cable from the cash drawer.
AC inlet
Connects to the AC power cord .
USB cable clamp
Fixes the USB cable in place to prevent it from being pulled out.
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