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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

The camera internally initiates readout of line "n" on its own. LineValid goes high a time "t

XFR

" 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

A time "t

Initiation

" 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 "t

IntegrationMax

" = "t

LinePeriod

" - "t

Reset

" - "t

Initiation

The line period "t

LinePeriod

" and the integration time "t

Integration

" 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

XFR

LinePeriod

Readout

2048 Clock Cycles

Reset

IntegrationMax

Initiation

n n+1

Data Cam era Output

Strobe Camera Output

Line Valid Cam era 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

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