Citizen CT-E601 Mode D'emploi page 56

Connecting a USB Device
1: For peripheral device control
Connect a peripheral device.
The connected peripheral device can be controlled.
2: For Apple device connection
Connect with an Apple device.
The printer and Apple device will communicate via the Lightning cable.
Fast charging of the Apple device can also be carried out.
3: For host computer communication
Connect with a host computer.
The printer and host computer will communicate via USB.
4: For supplying power
Connect a mobile device or other USB device.
Power can be supplied to a connected USB device.
* This port does not support USB data communication.
The Lightning model does not have a power supply function.
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Refer to 3.3 USB Interface
Refer to 3.8 USB Power Supply Port