Balluff MATRIX VISION mvBlueNAOS, Техническое руководство

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1.18 Use Cases 125
2. set "Timer Trigger Source" = "UserOutput0" .
3. set "Timer Trigger Activation" = "RisingEdge" .
I.e. a rising edge on UserOutput0 will start Timer1 .
4. Then set the "Timer Duration" property to the desired exposure time in us .
5. In "Setting -
>
Base -
>
Camera -
>
GenICam -
>
Acquisition Control" set the Trigger Selector = "FrameStart" .
I.e. the acquisition of one frame will start when
6. Timer1 is active: "Trigger Source" = "Timer1Active" .
7. Exposure time will be the trigger width: "Exposure Mode" = "TriggerWidth" .
The following diagram illustrates all the signals involved in this configuration:
Figure 1: Long exposure times using GenICam
To start the acquisition of one frame a rising edge must be detected on UserOutput0 in this example but other
configurations are possible as well.
1.18.1.2.2 Setting up the device
The easiest way to define a long exposure time would be by using a single timer. The length of the timer active
signal is then used as trigger signal and the sensor is configured to expose while the trigger signal is active. This
allows to define exposure time with micro-second precision up the the maximum value of the timer register. With a
32 bit timer register this results in a maximum exposure time of roughly 4295 seconds (so roughly 71.5 minutes).
When writing code e.g. in C# this could look like this:
private static void configureDevice(Device pDev, int exposureSec, GenICam.DigitalIOControl ioc)
{
try
{
// establish access to the CounterAndTimerControl interface
GenICam.CounterAndTimerControl ctc = new mv.impact.acquire.GenICam.CounterAndTimerControl(pDev);
// set TimerSelector to Timer1 and TimerTriggerSource to UserOutput0
ctc.timerSelector.writeS("Timer1");
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