RaspberryPi/UART
From OER in Education
RaspberryPi_UART_POWER.JPG
Raspberry Pi B+ powered via UART/serial cable:
RaspberryPi_UART_and_USB_power.JPG
Raspberry Pi B+ connected via UART/serial cable, but powered through USB:
Similar image, for model B from http://elinux.org/RPi_Serial_Connection
http://aperiodic.net/screen/quick_reference
RaspberryPi_UART_Ethernet.JPG
In both scenarios above, the ethernet cable can be connected as well. The picture below shows Raspberry Pi B+ connected via UART/serial cable and ethernet cable, powered through USB:
