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Camera Operation & Features
Document No.: 04646-01
PixeLINK PL-A780
MACHINE VISION CAMERA
SYSTEM GUIDE
Copyright © 2004 PixeLINK
All Rights Reserved
The connector pinout is listed in Table 8 on page 23. The connector’s interface schematic is
shown in Figure 13 below. The mating plug for the connector is an
HR10A-7P-6P
, a 6-pin
round plug connector with solder-cup pins for the cable wires.
The trigger inputs are designed to work with a floating differential signal which will supply
between 5V and 12V across the trigger terminals. With the Trigger polarity set to Positive, a
rising voltage will cause a trigger. A falling voltage will cause a trigger if the trigger polarity is
negative.
Figure 13 Machine Vision Connector—Interface Schematic
4.6.3.1 Trigger and GPO Timing
The default trigger latency on the PL-A780 cameras is 8 microseconds from the change in
the trigger signal until the start of the image reset, assuming the Trigger Delay feature is set
to zero. The start of integration will be delayed by the reset delay. This latency is due to:
•
Optical-isolation delay on the trigger input (assume 5 V turn-on) = 6 µs typical;
•
Debounce delay (5 MHz default) = 1.0 – 1.2 µs;
•
Synchronization delay to start of reset = 0.5 µs; and
•
Reset delay = 3.55 µs/row x N rows, where N is the number of rows, after
decimation.
The trigger input can be either positive or negative pulse. The minimum pulse width depends
on the debounce delay set in the camera – typically at least 50 microseconds for analog
signals and at least 1 microsecond for TTL signals.
