| R&TTE |
New European regulation for devices which are communicating on radio basis. |
| Random access (slide) |
Direct slide access, i.e., from slide 10 to slide 20. There is no slide by slide selection but, for example, direct access to slide 20. (Kodak) |
| Rear projection |
For reverse projection in transmitted light mode. Requires special rear projection screens. Opposite front projection. |
| Refresh rate |
Indicates how often an image can be displayed on the monitor per second (in Hz) (vertical frequency). |
| Resizing |
Mathematical process to fill up a signal of lower resolution to the format filling image of a projector with higher resolution. The dots not available in the signal are produced via interpolation. The result is a format filling bright image which appears somewhat fuzzy. |
| Resolution |
Number of horizontal and vertical pixels. An optimal image quality is achieved when the resolution of the PC graphic card complies with the resolution of the projector. For laptops it is the resolution of the built-in monitor. |
| RGB |
Red, green, blue: Colour synthesis process. Additive colour mixture. |
| RJ-11 |
International standard connection type for analogue telephones - also called "Western Connector". This connector is used for the connection of tele communication devices. This standard connector originates from the USA. Since the connector is quite reasonable, it is in the meantime also common for German telecommunications. |
| RJ-45 |
International standard connector for ISDN - and LAN cable. |
| Round magazine projector (slide) |
The synonym for the professional projector. These slide projectors operate according to the slide gate principle: The slide to be projected is transported via a slot and falls down gravity-wise. Once it has arrived the slide stage it is pressed-on and is locked in its position. This enables a high accuracy of positioning and therefore it is suitable for continuous operation. Mostly these projectors operate with a 250 W or also a 400 W lamp. |
| RS 232 |
Interface, which enables a control of the projector via PC or control unit such as AMX or Creston, also called V.24. |
| RS 422 |
Transmittance standard for serial transmittance of PC data. Unlike RS 232 - standard up to 1.200 m can be bridged with RS 422. The trade offers complying modifiers which can transform a RS 232 signal into a RS 422 standard. |
| RS 485 |
Standard for serial transfer of PC data. Comparable with the RS 232 - standard. Here, also 1.200 m can be bridged. There are complying modifiers on the market which can transform a RS 232 signal into a RS 485 standard. |
