ALLIED Vision Technologies Guppy F-503 - Manual (Page 203)

Video formats, modes and bandwidth
GUPPY Technical Manual V7.1.0
203
As a reference it uses a grid of up to 65534 sample points (in 2
n
steps)
equally spread over the AOI.
Frame rates
An IEEE 1394 camera requires bandwidth to transport images.
The IEEE 1394a bus has very large bandwidth of at least 32 MByte/s for trans-
ferring (isochronously) image data. Per cycle up to 4096 bytes (or around
1000 quadlets = 4 bytes@ 400 Mbit/s) can thus be transmitted.
Depending on the video format settings and the configured frame rate, the
camera requires a certain percentage of maximum available bandwidth.
Clearly, the bigger the image and the higher the frame rate, the more data
requires transmission.
The following tables indicate the volume of data in various formats and
modes to be sent within one cycle (125 µs) at 400 Mbit/s of bandwidth.
Note

Autofunction AOI is independent from Format_7 AOI settings.
If you switch off autofunction AOI, work area position and
work area size follow the current active image size.
To switch off autofunctions, carry out following actions in the
order shown:
1. Uncheck Show AOI check box (SmartView Ctrl2 tab).
2. Uncheck Enable check box (SmartView Ctrl2 tab).
Switch off Auto modi (e.g. Shutter and/or Gain) (SmartView
Ctrl2 tab).
Note

All bandwidth data is calculated with:
1 MByte = 1024 kByte