Hand Held Products Hand Held Computer Dolphin 7450 - Manual (Page 75)

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The power supply connector and RS-232 connector are located on the back panel of the unit:
Power supply connector Use this connector to attach a power supply to the charging/communications cradle. The power
supply provides power for communications and battery charging.
RS-232 communications port Use a standard serial cable to connect this port to a host RS-232 device.
Rear Panel of Dolphin Mobile Base
Power Supply
Connector RS-232
Communications
Port
Locking Lever