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Appendix D
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)
1 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
(EasyDLLs).
Some WinX (WinView and WinSpec) 2.5.X features are not fully supported with
USB 2.0. See 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
NO
File Information
YES
Not all header info is
currently available in
WinX 2.5.x through
PVCAM
Overlapping ROIs
NO
Macro Record
YES
Macros recorded for non-
PVCAM cameras may
have to be re-recorded to
function
TTL I/O
NO
Table 9. WinView/WinSpec Features Supported under USB 2.0