14
3.7.2
Opto-isolated Input
Opto-isolator can realize one-way transmission of signal due to that the optocoupler is transmitted
in one way. One-way transmission separates the input and output end completely, which
eliminates the influence output signals have on the input end, leading to high anti-interference
performance and strong working stability of the opto-isolator.
Line1 of the camera I/O signal is opto-isolated input and can sustain up to 25 mA current. For
detailed circuit, see Figure 3-20.
Line1 internal circuit
Figure 3-20
Table 3-3
Opto-isolated input circuit description
Input Voltage
Description
Remarks
30 VDC
Extreme voltage. Input voltage cannot
exceed the value. Otherwise, the device
might be damaged.
The 29 mm × 29 mm × 42 mm
GigE camera (products shipped
before January 2017) has an
optocoupler isolation input limit
voltage of 25 VDC, and I/O input
safe working voltage is 0–18
VDC.
0–24 VDC
Security working voltage range for I/O
input.
0–1.4 VDC
Logic 0.
> 1.4–2.2 VDC
The input status reverses, and the logic
status inside the voltage range is
unsure.
> 2.2 VDC
Logic 1.
Avoid the input voltage being inside 1–1.5 V, under which the circuit is not stable.
The breakdown voltage is 30 V. keep the voltage stable.
The sink current of the opto-isolated I/O input port is 5 mA–15 mA.
3.7.3
Opto-isolated Output
Line0 of the camera I/O signal is opto-isolated output. Refer to Figure 3-21 for detailed internal
circuit.
