6 Input/Output Control
If both power sources are connected the camera always uses external power over the GPIO connector.
Note:
Some systems, especially those with laptop computers or
longer cable lengths, may not provide adequate power through the
USB 3.0 cable which could result in intermittent operation. The use
of external power through the GPIO is required for these systems.
The camera does not transmit images for the first 100 ms after power-up. The auto-exposure and auto-white balance
algorithms do not run while the camera is powered down. It may therefore take several images to get a satisfactory
image.
When the camera is power cycled (power disengaged then re-engaged), the camera reverts to its default factory
settings, or if applicable, a saved user set.
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How can I power my USB 3.0 camera?
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6.2
GPIO Electrical Characteristics
Both the opto-isolated input and output have over current protection.
The output is open collector and thus requires a pull-up resistor to operate. The rise time and bias current will be
determined by the resistor value chosen. If the camera is generating an output signal that approaches the rise time plus
the fall time of the opto-isolated circuit, care must be taken to optimize the pull-up resistor chosen to minimize the rise
time while still remaining within the current limits of the output circuit.
The opto- isolated specifications listed below are applicable when power to the camera is provided through the
interface and not through the GPIO.
Warning!
To avoid damage, connect the OPTO_GND pin first before
applying voltage to the GPIO line.
Warning!
Prolonged use of the camera outside of the Operating
Range described below may lead to unexpected behavior and should
be avoided.
2/19/2019
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FLIR Blackfly
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S Installation Guide
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