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Isolated inputs and outputs by optical transformer.
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Optocoupler basics
 Diagram of basic optocoupler function | An optocoupler is a device using optical path to transfer an electronic signal between two circuits. It basically consists of a photodiode between pin 1 and 2 converting the input signal to light and a phototransistor converting the light again to electronic signal at pin 3 and 4. The optocoupler is useful in situations where one part of the circuit needs to be galvanically isolated from the other part to prevent damage or unwanted interference. It is used to prevent ground loops or to block voltage spikes. For effective use of the optocoupler it is important to control it using an independent power supply. When the external circuit is galvanically connected to the camera (eg. when reusing the camera's power to control the optocoupler), the optocoupler's protective function is eliminated. |
Due to the schematic characteristic the signal transmitted through an optocoupler interface will be inverted. For details please see schematic below.
Optocoupler parameters summary
Parameter | Input Value | Output Value |
|---|---|---|
Operating voltage | 3.3 - 30 V | 3.3 - 30 V |
Input current | 7.5 mA | < 100mA |
External resistor requirement | No | Yes, output current must be limited to 100 mA |
ON voltage level | > 4.5 V | |
OFF voltage level | < 1.5 V | |
OFF to ON delay | < 125 ns | 750 ns |
OFF to ON rise time (10 to 90%) | 1.0-4.0 µs | |
ON to OFF delay | < 125 ns | 2.4 – 25 µs |
ON to OFF fall time (90 to 10%) | 9.0 – 140 µs | |
OFF to ON jitter | ± 5 ns | ± 20 ns |
ON to OFF jitter | ± 5 ns | ± 0.1 µs |
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Optocoupler inputs
iam is equipped with four optically isolated input lines. One input optocoupler is fully independent, the other three are connected with a common cathode (Section “I/O connector”) due to limited number of pins on the I/O connector. Each input line is protected by a current limiter circuit.
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The optocoupler input lines are equipped with a debouncer debounce/deglitch feature to prevent generating unwanted input signals. This feature can be enabled by software e.g. SynView. The delay-time is configurable.  |
Trigger input
Any of the available optocoupler inputs can be used for triggering. The input line mapping on the camera connectors is described in section Connector and cable description .
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