Image Processing Reference
M-6 Communications and Networking Connectors
MIDI (DIN5 way)
Modem connector RJ 11
Ethernet connector RJ-45
BT plug (UK)
RS 232/485 DB9
RS 232 DB25
There are other DIN plug formats.
DIN plugs with 2 pins are usually a loudspeaker connections. Don't connect them
to a line input.
Some 5-pin DIN connectors carry balanced or unbalanced audio, especially on
older consumer audio equipment made for the European market.
Sometimes you will find a 7-pin DN connector on a piece of equipment.