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Article Excerpt
By Ann R. Thryft, Contributing Technical Editor
The GigE Vision interface standard brings several benefits to machine-vision inspection of PCBs (printed-circuit boards), semiconductors, and wafers. A flurry of product introductions this year has demonstrated the growing popularity of the interface in machine-vision cameras, from small embedded boards to two-box, 12-Mpixel cameras (see "Machine-vision cameras get GigE," p. 65).
Perhaps GigE Vision's main benefit is its 125-Mbps speed, which allows what previous Ethernet standards did not: the ability to reliably handle streaming, uncompressed image data and transmit that data over cables as long as 100 m. Compared to Camera Link's 10-m and FireWire's 5-m cable lengths, GigE's longer reach opens up new configuration possibilities for keeping PCs and related image-processing hardware far away from the harsh production line environment. GigE's 100-m cable length--and the ubiquity and low cost of standard Ethernet hardware, cables, and connectors--makes that possible without repeaters or extenders.
These aspects of GigE also make it possible for manufacturers to set...
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