Dalsa C1240, Руководство пользователя

Страница: 144 / 327

134 • Operational Reference Nano Series GigE Vision Camera
Trigger Source Types (Trigger Mode=On)
•
Trigger Source=Software: An exposure trigger is sent as a control command via the
Ethernet network connection. Software triggers cannot be considered time accurate due to
network latency and sequential command jitter. But a software trigger is more responsive
than calling a single-frame acquisition since the latter must validate the acquisition
parameters and modify on-board buffer allocation if the buffer size has changed since the
last acquisition.
•
Trigger Source = Line 1 or 2: An external trigger signal is opto-coupled and subject to a
signal debounce, input delay, plus inversion circuits.
•
Trigger Source=Timer1End Event: The Timer1 End Event is used as the internal trigger
source. Refer to Counter and Timer Controls for information on those features.
• Trigger Source=Counter1End Event: The Counter1 End Event is used as the internal
trigger source.
• Trigger Source = Action 1 or Action 2: A GigE Vision Action Command message is used
as trigger source. Action commands are broadcast by a calling program and used to trigger
multiple GigE Vision devices on a network. See GigE Vision Action Command Reference
for details.
•
Trigger Source = Timestamp Modulo Event: The Timestamp Modulo event is used to
synchronize multiple camera acquisitions and automate repetitive acquisitions based on
either the camera’s internal Timestamp counter or a system wide PTP counter. See
Examples using Timestamp Modulo Event for Acquisitions.
Input Line Details
The general purpose input line signals are connected to I/O lines 1 and 2, which have the following
features for control or status indication.
•
Feature set: LineSelector (RW), LineName (RO), linePinAssociation (RO), LineFormat (RO),
LineMode (RO), lineDetectionLevel (RW), lineDebouncingPeriod (RW), LineInverter (RW),
LineStatus (RO).
•
Connector: See 10-pin I/O Connector Pinout Details for connector pinout and electrical
information. The cable shell and shield should electrically connect the Genie Nano chassis to
computer chassis for maximum EMI protection.
•
Line Transition Validation: Each input incorporates a signal debounce circuit (following
the opto-couple) to eliminate short noise transitions that could be wrongly interpreted as a
valid pulse. The duration is user-programmable from 0µs to 255µs with CamExpert.
• Line Signal Propagation & Timing: Maximum delay values are defined in Input Signals
Electrical Specifications.