Supplying Power To The Cradle - Symbol DS 3478 Product Reference Manual

5. If using an external power supply, insert the power cable into the power port on the back of the digital scanner cradle, and
connect the power supply to an approved AC supply (see the cradle's Quick Reference Guide for more information).
Disconnect the power supply before changing host cables, or the digital scanner may not recognize the new
host.
Different cables are required for different hosts. The connectors illustrated in each host chapter are examples
only. The connectors may be different from those illustrated, but the steps to connect the digital scanner
remain the same.

Supplying Power to the Cradle

The cradle receives power from one of two sources:
• An external power supply.
• When connected to a powered host through a host cable that supplies power.
The cradle detects whether the host or an external supply is supplying power. It always draws power from the external supply when
available, regardless of the presence of power from a host.
Using the Host to Supply Power
When the cradle is connected to a powered host, the host can sometimes power the cradle rather than an external power supply.
Consider the following when powering from a host:
• The digital scanner charges at a slower rate than when charging from an external power supply.
• The cradle can charge a digital scanner only in single point mode. An external power supply is required to charge a digital
scanner in multipoint mode.
• A powered USB port provides enough power to the cradle for charging.
• Not all hosts provide enough power to the cradle for charging. For these hosts, connect an external power supply.
The radio link functions normally when the cradle draws power from a host.
For more information on single and multipoint operation, see
Host Port
Figure 1-4. Connecting the Cables to the Cradle
Pairing on page
Power Port
1-11.
Getting Started 1-7