LineValid
Camera Output
Notes specific to this mode
1 The camera is not triggered -- instead, the camera itself synchronizes the system. This is the default mode
set by the factory
2The camera internally initiates readout of line "n" on its own. LineValid goes high a time "tXFR" afterwards
3 The user must synchronize motion of the material moving past the camera to the camera's LineValid output
4 The user must synchronize collection of data in the PC frame grabber to the LineValid camera output
5 While LineValid is high, data may be sampled on rising edges of Camera Strobe Output for the 2048 clock cycles
of readout as shown in the inset above; this is the same for all four modes
6A time "tInitiation" after the camera internally initiates the readout-and-integration cycle, the camera also internally
initiates pixel reset; Integration then begins time "tReset" later, with this integrated information to be read out
in the subsequent line "n+1"
7 The factory-set default is for integration to run until the end of the line period, which results in a maximum
integration time "tIntegrationMax" = "tLinePeriod" - "tReset" - "tInitiation".
8The line period "tLinePeriod" and the integration time "tIntegration" are selected by the user with the Command Software
Table 3.4.2 -- Mode 1: Freerunning
...in this basic mode, usually used for diagnostics & debugging,
no triggering is applied to the camera...
...instead, the camera drives the system with the LineValid Camera Output.
The Line Period and Integration
tXFR
tLinePeriod
tReadout
2048 Clock Cycles
tReset tIntegrationMax
tInitiation
nn+1
Data Came ra Output
Strobe Camera Output
Line Valid Camera Output
1 2 3 2047 2048
may be shortened
with the Command Software
Fairchild Imaging • CAM/CMOS-2K.LS Line Scan Camera User’s Manual • Rev A • 20 of 41