Help Me Choose An Interface

Parallel - Printer Side
This is the Parallel Port on the printer itself, if you are replacing a printer, and the port on the printer looks like this, it is a Parallel printer. 
This does not apply to Ithaca Printers (See next picture).
Parallel - PC Side
This is the Parallel Port, located on the back of your computer. If you have one of these available, and your software supports a Parallel port, you may choose to use a Parallel Interfaced receipt printer.
Ithaca parallel printers will have a port like this on the back of the printer.
Serial - DB25 Printer Side
This is the Serial Port on the printer itself, if you are replacing a printer, and the port on the printer looks like this, it is a serial printer.
Look at the next picture to help determine which cable you will need.

DB9 - SerialDB25 - Serial
DB-9 and RS-232 DB25 Male

These are Serial Ports, located on the back of your computer. If you have one of these available, and your software supports a serial port, you may choose to use a Serial Interfaced receipt printer. Make a note on which type of port you have available.
Your cable choices will be DB9 or DB25.

USB - Device Side
(USB Device Side)

USB - PC Side
(USB PC Side)

These are USB (Universal Serial Bus) ports, which can be located on front or back of the PC. PC side is always a rectangular shape. USB on the device side is usually square shaped, but can differ depending on the device.

VGA - Video Connection
This is a VGA or video port with 15 female pinholes, located on the back of most video monitors. PC side looks exactly the same.
DVI - Video Connection
This is a DVI (Digital Video Input; successor to the VGA port) port on the back of a monitor. DVI is used for transferring video from the video monitor to a PC. PC side looks exactly the same.
RJ11 - Usually Printer Drawer Kick Port
This is an RJ-11 port, located on the back of most modern receipt printers, if equipped you can plug a printer interfaced cash drawer directly into the printer.

Female - BNCBNC - Male
Female BNC and Male BNC

This is a BNC Connector, the "Female" connector (left image) is located on both the computer and printer. The Male BNC(right image) are attached to the cable that connect the devices.

5 Pin Din - Male & Female
Male 5 Pin Din & Female 5 pin din socket

8 Pin Din - Male & Female
Male 8 Pin Din & Female 8 Pin Din

The larger din connectors are sometimes used to connect certain receipt printers and cash drawers to typically older or proprietary terminals.

PS/2 - Male and Female
PS/2 Male & PS/2 Female Interfaces

PS/2 interface or 6 pin mini din. Popular use is for bar code scanners, keyboards and other input devices. The Male PS/2 (Left image) can be identified by counting 6 metal pins in a semi circle around a plastic center pin the end is a little bit bigger than a standard #2 pencil eraser. The female PS/2 (right image), can be identified by the small
size, slightly larger than a #2 pencil eraser, six holes in a semi-circle around a square hole in the center.

PS/2 & AT ConnectionsTop image PS/2 is aproximately 1/4".
Bottom Image is an AT interface and is aproximately 1/2".
PS/2 interface top - AT Interface Bottom