How do I connect the projector and the source?

We would like to explain the functionaity of all ports and connections availabe to connect a projector to the source. Depending on the model, connections will vary. We will also advise which connections are required for which resolution and provide details on how to connect a projector to an Apple computer. This should help in deciding the right projector for your requirements and hopefully minimise any unexpected issues.

Analog video

Analog video and PC interfaces have been used for many years. Due to the lower data rate they provide a lower image quality in comparision to digital connections. They are still used in many source devices such as DVD players and VCRs.

Composite Video

To identify this connection, it is usually colour coded in yellow. Data transmission only occurs over one channel resulting in a lower quality image.


The S-video connection is also known as S-VHS or Hosieden connection. It operates over two channels (brightness/colour) and compared to the Composite video connection provides a higher quality image.


The VGA connection is an analog 15-pin connection for image transmission. It is also called D-Sub15 and will be commonly found with notebooks, laptops and desktop PCs. Compared to other analog connections, it provides a good quality image. It can be screwed securely to niput or output port and is suitable for component video confirguration.

VGA out

The VGA out connection enables looping of the VGA input signal through the projector allowing to connect to another display device (screen or projector).

Component video

The component video (also RGB connection) is an analog video connection with three channels (brightness and two colour channels). It provides the best quality analog video connection.

Digital video

Digital connections provide a better quality image transmission than analog connections as they operate with significantly more transmission channels. They are essential for transmission of HD material.


Digital connection for the transmission of image and audio. This is necessary for a high definition picture quality (HDTV). HDMI 1.4 (high speed) is suitable for the transmission of 3D content in full HD.



Digital connection for image transmission. It can be screwed securely to input and output device. The transmission length is usually limted to approx 15m. It is easy to adapt DVI-D to HDMI.


Digital and analog connection for image transmission. It can be screwed securely to input and output device. The transmission length is usually limted to approx 15m. It is easy to adapt DVI-D to HDMI.


Analog connection for image transmission. It can be screwed securely into input and output device. The transmission length is limited to approx 15 m.


Monitoring and control

Monitoring and control ports are used for transmission of control signals. They are mainly used in fixed installations where it may be required to remotely control the device itself.


It is possible to control the projector via RS232 port, switching on and off for instance. It looks similar to the VGA port. It is also available in a rounded format as an RS232C port.

USB Type B

The USB Type B connection is mainly used to control presentations via the remote control of the projector. The signal is looped through the projector to the PC.


The LAN connection is designed to transmit and control data and has superseded the RS232 or RS232C ports as a control and monitor interface. For some devices, it is also used to transmit data but does not offer the same image quality provided by an HDMI, DVA or VGA connection.

Audio Anschlüsse

Audio ports provide the option to directly transmit audio signals into the projector with built-in speakers. It is also possible to loop the signal through the audio output ports. Audio connections are usually analog.

3,5 mm jack IN

The 3.5 mm jack (input) provides the option to receive an audio signal from an external source. This port is also called mini-jack.

3,5 mm jack OUT

Via the 3.5 mm jack (output) it is possible to loop an audio signal through the 3.5 mm input of the projector. This is useful when using external speakers.

Composite audio

This connection provides the option to send an audio signal to the projector. It is of better transmission quality compared to the 3.5mm jack.

Data transmissions

Data connections like the USB type A provide the option to read data directly from other media. It is important to note that projectors vary considerably in which formats they are able to read data.

USB Type A

This connection enables the projector to read data from an external storage media (such as USB sticks). Most projectors, however, are only able to play image files in JPEG format. Very few projectors are able to read and play video files or Microsoft Office format files directly.


Wireless data transmission is increasingly offered in some projectors. It is usually a WLAN (WiFi) connection. The projector will have a built-in receiver to talk to the transmitter in the computer. However, it should be noted that the strength of the wireless signal may often not be sufficient and is not as reliable as a cabled connection.


Projectors which offer the WLAN option, are able to transmit images, text or presentations via WLAN. Due to the often insufficient strength of the signal, the transmission of video may only be partially possible. The exception are some of the latest home cinema projectors. Some projectors are able to transmit via apps (IPad/IPhone) wirelessly.



How to connect a projector to an Apple Mac

Apple Macs use different connections than other PCs. An adapter is always required when connecting to a projector.


Mini Displayport

VGA or DVI adapter

Optional: DVI to HDMI cable


The Mini DisplayPort is now primarily used by Apple. It is a digital connection but is also able to process analog signals. The mini DisplayPort requires an adapter for VGA/DVI/HDMI. A DVI connection is quite rare in projectors nowadays. If you wish to connect to an HDMI connection, a DVI to HDMI adapter cable is recommended. This is a digital connection for transmission of image and audio. It is required for high-definition picture quality (HDTV). HDMI 1.4 (High Speed) is suitable for transmission of 3D content in full HD.



Which resolution is supported by which connection?

The following table provides an overview of which resolution is supported by which connection. This should help to determine the best resolution.