What Is a Camera Link Cable?
A camera link cable adheres to the Camera Link standard, which specifies the connection between industrial digital cameras and image input boards (frame grabbers) embedded in PCs. Developed in 2000 by the Automated Imaging Association (AIA), this standard was the first to define connections for industrial digital cameras and frame grabbers, and it remains widely used.
These cameras, primarily integrated into manufacturing equipment and controlled by devices like PCs, require specific cables for connectivity. PCs generally use Camera Link-compatible frame grabbers installed in expansion slots, as built-in interfaces for Camera Link are uncommon. Other standards for connecting industrial digital cameras to PCs include CoaXPress and USB3Vision.
Uses of Camera Link Cable
Camera link cables are specialized for connections between Camera Link-compatible devices, including industrial digital cameras, frame grabbers, and Camera Link repeaters, splitters, and multiplexers.
- Camera Link Repeater: Extends the length of Camera Link cables beyond the 10-meter limit to a maximum of 20 meters.
- Camera Link Splitter: Transmits video data from a single digital camera to multiple frame grabbers simultaneously.
- Camera Link Multiplexer: Routes video data to multiple frame grabbers without the need for simultaneous transmission.
Principles of Camera Link Cable
Camera Link is based on National Semiconductor’s Channel Link technology, initially developed for flat-panel displays. It uses low voltage differential signaling (LVDS) for high-speed signal transmission, employing four sets of signal lines for transmitting data and controlling the camera. Camera Link transmits 28 bits of data with one clock, allocating 24 bits for video data, 3 bits for active signals, and 1 spare bit.
How to Choose a Camera Link Cable
When choosing a Camera Link cable, consider the connectors at both ends of the cable, as they are integral to the cable and cannot be purchased separately. Variations include Power over Camera Link (PoCL) compliant cables, which also supply power to the camera, and compact connectors like SDR26pin, in addition to the standard MDR26pin. Cables designed for repeated bending, suitable for mounting on robot arms, are also available. Ensure compatibility with the camera and frame grabber connectors and select a product that fits the usage environment. Consult manufacturers or suppliers for guidance in selecting the appropriate cable.