AW00123402000 Physical Interface
Basler ace USB 3.0 59
5.10 Temporal Performance of I/O Lines
This section describes delays ("propagation delays") resulting from the operation of the camera’s
input and output lines. For image acquisition, the propagation delays must be added to the delays
described in Section 6 on page 85.
You will need the information included in this section most likely only if you need microsecond
accuracy when controlling camera operation via I/O lines.
All examples in this section assume that the I/O line inverters are disabled.
5.10.1 Introduction
As indicated in Section 5.2 on page 46, the camera provides two different kinds of I/O lines:
opto-isolated I/O lines
direct-coupled General Purpose I/O (GPIO) lines.
The related electrical characteristics and circuit schematics are given in Section 5.7 through
Section 5.9.
With regard to use, the two kinds of I/O lines differ mainly in these respects:
The opto-isolated I/O lines have the advantage of being distinctly more robust against EMI
than the GPIO lines.
The propagation delays ("response times") differ between the two kinds of I/O lines.
A propagation delay is the time that elapses between the moment when a signal voltage passes
through the transition threshold and the moment when the related line status changes - and vice
versa (see Figure 37 for camera input and Figure 38 for camera output).
The following important characteristics are apparent from Figure 37 and Figure 38:
The propagation delays for the opto-isolated I/O lines are in most cases longer than for the
GPIO lines. In other words, the opto-isolated I/O lines are usually "slower" than the GPIO lines.
The edges of an analog signal are associated with different propagation delays. The edges
with the shorter propagation delays (the "fast" edges) are indicated by asterisks in the figures.
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