Unable to change TriggerMode

Hello, I am configuring two Basler acA1920-155um in python. An excerpt of my code is for i in range(2): self.Camera[i].TriggerSource = "Line3" self.Camera[i].TriggerSelector = "FrameBurstStart" self.Camera[i].TriggerMode = 'On' self.Camera[i].LineSelector = "Line3" self.Camera[i].LineMode = "Input"

But when I try to trigger the camera, with an external signal, I get the TimeoutHandling_ThrowException When I open pylon Viewer I see that TriggerMode is Off and LineSelector is Line1 If I change these, in pylon viewer, (to On and Line3, respectfully) and rerun the external trigger signal, it works.

Any thought why e.g. self.Camera[i].TriggerMode = 'On' don’t crash, but don’t set the property?

[gaeeronimo]

TriggerSource & TriggerMode are selected by TriggerSelector, so you need to set TriggerSelector first to the Trigger you want to configure (eg. FrameBurstStart if you want to trigger a burst of frames). After selecting the Trigger you may configure it (eg. enable it by TriggerMode = 'On' and set the source by TriggerSource = 'Line3').

Try it this way:

for i in range(2):
    self.Camera[i].TriggerSelector = "FrameBurstStart" # <== Selector first!
    self.Camera[i].TriggerSource = "Line3"
    self.Camera[i].TriggerMode = 'On'

    self.Camera[i].LineSelector = "Line3"
    self.Camera[i].LineMode = "Input"

[SpangeJ]

TriggerSource & TriggerMode are selected by TriggerSelector, so you need to set TriggerSelector first to the Trigger you want to configure (eg. FrameBurstStart if you want to trigger a burst of frames). After selecting the Trigger you may configure it (eg. enable it by TriggerMode = 'On' and set the source by TriggerSource = 'Line3').

Thank you, @gaeeronimo, this was precisely it! I changed the order, such that TriggerSelector was prior to TriggerSource & TriggerMode and now self.Result[i] = self.Camera[i].RetrieveResult(5000,pylon.TimeoutHandling_ThrowException) runs smoothely!