RS-232 is used over serial ports, which are typically found on computers and various electronic devices for communication. It transmits data one bit at a time, using a standard defined by the EIA (Electronic Industries Alliance). Commonly, RS-232 ports are DB9 or DB25 connectors, though modern devices may use USB-to-serial adapters to facilitate RS-232 communication.
Terminal connections for controlling devices, some times Mice or older keyboards. Not commonly used any more.
spdif is a digital audio Output, Certain a/v receivers may offer this type of connection, however if your using HDMI for audio, then their probably wont be much benefit. an RS232 port is generaly used either for software updates and servicing, or for external control of the unit via a 3rd party control system.
Serial port, this one, (http://en.wikipedia.org/wiki/Image:RS-232.jpeg) it is usually coloured green on modern computers.
USB Port
USB Port
USB Port
A USB port is the type of port that is used by an infrared mouse. This type of mouse does not require batteries and uses infrared light in order to operate.
The Type F charging port is commonly used in Iceland for electronic devices.
Port is a noun as in "He docked the ship in the port." Port can be used as a verb. It describes an action. "Port the boat over there."
The port is a USB (Universal Serial Bus).
Rollover cable is used.
Console cable. DB4