Xtium-CLHS PX8 User's Manual
Xtium-CLHS PX8 Reference
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41
CORACQ_PRM_EXT_LINE_TRIGGER_SOURCE – Parameter Values
Specific to the Xtium-CLHS PX8
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
From Shaft Encoder Phase A & B
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 6: CORACQ_PRM_EXT_LINE_TRIGGER_SOURCE – Parameter Values
CVI/CCF File Parameters Used
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External Line Trigger Source = parameter 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/J4: Pin 3 (Phase A +) & Pin 2 (Phase A -)
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Input Phase B: Connector J1/J4: Pin 6 (Phase B+) & Pin 5 (Phase B-)
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See J1: External I/O Signals Connector (Female DH60-27P) 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
by the acquisition linescan camera. The Xtium-CLHS PX8 supports single or dual phase shaft
encoder signals. Dual encoder signals are typically 90 degrees out of phase relative to each other
and provide greater web motion resolution.
Example using any Encoder Input with Pulse-drop Counter
When enabled, the triggered camera acquires one scan line for each shaft encoder pulse-edge. To
optimize the web application, a second Sapera parameter defines the number of triggers to skip
between valid acquisition triggers. The figure below depicts a system where a valid camera trigger
is any pulse edge from either shaft encoder signal. After a trigger, the two following triggers are
ignored (as defined by the Sapera pulse drop parameter).
