Ultra Start KE-6 Specifications Page 92

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Version 1.1 rev Jan 2013
Page 92
iXon Ultra
Hardware
4.4 – USB 2.0 INTERFACE
USB 2.0 is a convenient interface standard for use with a Scientic camera, as it is designed to be “plug and play” and
is available on all modern PCs, including Laptops and tablet PCs. Most modern desktop PCs will be able to support at
least two iXon Ultras running at full Frame rate.
The underlying system software of the PC is responsible for automatically assigning resources and usually performs this
properly – some conicts can arise when resources are not released properly by third party USB drivers. Please contact
Andor on how to resolve this conict if problems are encountered.
Most PCs are tted with two EHCI (Enhanced Host Controller Interfaces) and are therefore able to support two devices
running USB 2.0 at “high speed”. USB 3.0 PCI-e interface cards can be used if more than two high speed USB 2.0
interfaces are required simultaneously (USB 2.0 interface cards generally use a PCI interface standard and do not offer
the adequate bandwidth).
On some desktop PCs, the USB connectors on the front panel are implemented badly and will fail to connect to any
USB 2.0 high speed device. If this occurs, use a rear panel USB connector as these are mounted directly on the
motherboard.
Figure 40: Camera Architecture
If the PC is busy when transfers are ongoing – a buffer memory is available within the camera – this is usually at 2-3%
ll. The camera will issue a warning if the processing load on the PC is excessive and it is starting to impact on the
memory ll of the camera.
The iXon Ultra automatically switches from 16 bit to 32 bit transfer mode – when running with real time count convert
active for example. This happens seamlessly under software control, and is needed because, in count convert mode,
the number of electrons/photons detected can be > 2^16.
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