ALLIED Vision Technologies Guppy PRO F-503 - Manual (Page 79)

Camera interfaces
Guppy PRO Technical Manual V4.0.0
77
IO_INP_CTRL 1
The Polarity flag determines whether the input is low active (0) or high
active (1). The input mode can be seen in the following table. The PinState
flag is used to query the current status of the input.
The PinState bit reads the inverting optocoupler status after an internal
negation. See
Figure 30: Input block diagram on page 75.
This means that an open input sets the PinState bit to 0. (This is different
to AVT Marlin/Dolphin/Oscar, where an open input sets PinState bit to 1.)
ID Mode Default
0x00 Off
0x01 Reserved
0x02 Trigger input Input 1
0x03..0x1F Reserved
Table 24: Input routing
Note

If you set more than 1 input to function as a trigger input,
all trigger inputs are ANDed.