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Appendix E
USB 2.0 Limitations
The following information covers the currently known limitations associated with
operating under the USB 2.0 interface.
Maximum cable length is 5 meters (16.4 feet)
2 MHz is currently the upper digitization rate limit for the ST-133 Controller.
Large data sets and/or long acquisition times may be subject to data overrun
because of host computer interrupts during data acquisition.
USB 2.0 is not supported by the Princeton Instruments PC Interface Library (Easy
DLLS).
Some WinView 2.5.X features are not fully supported with USB 2.0. Refer to
the table below.
Feature
Supported with USB 2.0 in
WinX 2.5.X
Remarks
Demo Port Capability
NO
DIF
NO
Kinetics
YES
WinX 2.5.18.1
Reset Camera to NVRAM
Defaults
NO
Temperature Lock Status
YES
WinX 2.5.x doesn’t utilize
hardware lock status
PTG
YES
Virtual Chip
NO
Custom Timing
YES
WinX 2.5.18.1
Custom Chip
YES
WinX 2.5.18.1
Frames per Interrupt
NO
RS170 (Video Output)
NO
Online Exposure
YES
File Information
YES
Not all header info is
currently available in
WinX 2.5.x through
PVCAM
Overlapping ROIs
NO
Table 9. Features Supported under USB 2.0 (continued on next page)