4. Interfacing to the world 49
Figure 4.7: Input event generation and readout
Warning
Event ags are set at each input event; when consecutive input events of the
same type (rising or falling) happen between two event ag readouts (event
ag overrun), the input event latches the rst event only and the following
events will be lost.
4.3.1.3 RS-422
NECTA input ports natively support differential signaling according to the RS-422 standard.
Figure 4.8: Connecting a RS-422 input signal
If your application requires connecting multiple devices to the same RS-422 line, please use a bus topol-
ogy. For example, if you want to connect a trigger signal to multiple cameras, please implement the
connections as shown in Figure 4.9:
Caution
AVOID other topologies (e.g. star) when connecting devices.
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