ALLIED Vision Technologies Guppy PRO F-503 - Manual (Page 25)

FireWire
Guppy PRO Technical Manual V4.0.0
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• Diverse camera powering options, including single-cable solutions up to
45 W
• Effective multiple-camera solutions
• Large variety of FireWire accessories for industrial applications
• Availability of repeaters and optical fibre cabling
• Forwards and backward compatibility blending 1394a and 1394b
• Both real-time (isochronous) and demand-driven asynchronous data
transmission capabilities
FireWire in detail
Serial bus
Briefly summarized, FireWire is a very effective way to utilize a low-cost
serial bus, through a standardized communications protocol, that establishes
packetized data transfer between two or more devices. FireWire offers real
time isochronous bandwidth for image transfer with guaranteed low latency.
It also offers asynchronous data transfer for controlling camera parameters,
such as gain and shutter, on the fly. As illustrated in the diagram below,
these two modes can co-exist by using priority time slots for video data
transfer and the remaining time slots for control data transfer.
Figure 2: 1394a data transmission