RS-232 (remote control protocol) {1-2 inputs} - this allows for third party control hardware/software such as Crestron or AMX. Many churches only use the wireless remote control and never bother using RS-232.
USB - some projectors allow a USB mouse to be used for controlling the cursor that is found on many remote controls. Note that the USB connection isn't used to send video to the projector.
Flash Card slot –
- Some portable projectors allow a flash memory card (like the ones used in digital cameras) to hold a PowerPoint show on the card so that a laptop isn't needed to do a presentation.
RJ-45 –
- Some projectors now allow a "CAT-5" connection for networking the projector. The typical benefits are the ability to check lamp status, projector temperature (too hot usually means a clogged filter needs cleaning) and on/off controls.
PCMCIA card slot –
- The ability to use a wireless network card, such as the type used in portable laptop computers, is beginning to be seen on projectors. This functionality allows the projector to be tied into a network, and be seen as a device, much like printer can be seen as a device on the network. The wireless portion also means no need for any of the cables mentioned above – the PC's signal is sent through another PCMCIA wireless network card, too!
- A few projectors use this slot to insert Compact Flash or Microdrives for playing back images without a laptop.
This is a very basic description about the common input types found on today's projectors. It serves as a ‘launching pad' to help in the education of the technology, and is not intended to be the final answer. After all, technology changes every minute!
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