AW00123409000 Physical Interface
Basler ace USB 3.0 89
Opto-isolated I/Os and Direct-coupled GPIOs
Generally use the "fast" edge of a signal for tight temporal control and to minimize unwanted
influence on propagation delays.
The propagation delays for a "fast" edge will rarely exceed 15 µs for an opto-isolated I/O line,
and rarely 1 µs for a direct-coupled GPIO line. Under very unfavorable conditions, propagation
delays related to "slow" edges can take milliseconds.
To minimize propagation delays related to a "fast" edge, increase the load resistance.
To minimize propagation delays related to a "slow" edge, use an I/O supply voltage
between 3.3 VDC and 5 VDC and decrease the load resistance such that a load current
between 30 mA and 40 mA will result.
Use the direct-coupled GPIO lines when you need to minimize propagation delays but mind
their greater susceptibility to EMI compared to the opto-isolated I/Os.
Opto-isolated I/Os
When you apply current to the input and output lines for extended periods or even for most of
the time you will promote aging of the optocouplers. Keep the times when current flows to a
minimum to preserve stable propagation delays.
Signal edge-to-edge variation (jitter) resulting from I/O operation itself is negligible
but can be introduced by your trigger signal.
To avoid jitter, make sure the rise and fall times of your trigger signals are short,
preferably < 500 ns. The camera’s inherent jitter is less than 100 ns, peak to peak.
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