Xtium-CL PX4 User's Manual
Xtium-CL PX4 Reference
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39
Line Trigger Source Selection for Line scan
Applications
Line scan imaging applications require some form of external event trigger to synchronize line scan
camera exposures to the moving object. This synchronization signal is either an external trigger
source (one exposure per trigger event) or a shaft encoder source composed of a single or dual
phase signal (also known as a quadrature).
The Xtium-CL PX4 shaft encoder inputs provide additional functionality with pulse drop, pulse
multiply, and pulse direction support.
The following table describes the line-trigger source types supported by the Xtium-CL PX4. Refer to
the Sapera Acquisition Parameters Reference Manual (OC-SAPM-APR00) for descriptions of the
Sapera parameters.
Parameter Values Specific to the Xtium-CL PX4
PRM Value Input used as:
External Line Trigger
Input used as:
External Shaft Encoder
if
CORACQ_PRM_EXT_LINE_
TRIGGER_ENABLE = true
if
CORACQ_PRM_SHAFT_
ENCODER_ENABLE =true
0
From Shaft Encoder Phase A (default)
From Shaft Encoder Phase A & B (default)
1
From Shaft Encoder Phase A
From Shaft Encoder Phase A
2
From Shaft Encoder Phase B
From Shaft Encoder Phase B
3
n/a
From Shaft Encoder Phase A & B
4
From Board Sync #1
n/a
5
From Board Sync #2
n/a
Table 7: CORACQ_PRM_EXT_LINE_TRIGGER_SOURCE – Parameter Values
CVI/CCF File Parameters Used
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External Line Trigger Source = prm value
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External Line Trigger Enable = true/false
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Shaft Encoder Enable = true/false
Shaft Encoder Interface Timing
Dual Balanced Shaft Encoder RS-422 Inputs:
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Input Phase A: Connector J1: Pin 3 (Phase A +) & Pin 2 (Phase A -)
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Input Phase B: Connector J1: Pin 6 (Phase B+) & Pin 5 (Phase B-)
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See
J1: External Signals Connector (Female DH60-27P)
" on page 69
for complete
connector signal details)
Web inspection systems with variable web speeds typically provide one or two synchronization
signals from a web mounted encoder to coordinate trigger signals. These trigger signals are used
