How to use the Output Line of a GigE camera correctly?

I'm trying to synchronize two GigE cameras (Basler acA1300-30gm) by hardware triggering one using the output line of the other camera. At the moment I'm stuck at getting the right signal from the master (triggering) camera.

I tried the following and watched the output line with an oscilloscope:

clear all;
close all;
imaqreset();

n = chooseGigeCam('CameraID');
vid = videoinput('gige', n, 'Mono8');
src = getselectedsource(vid);

triggerconfig(vid, 'manual');
src.ExposureTimeRaw = 100000;
src.Out1LineSource = 'ExposureActive';

vid.FramesPerTrigger = 1;
vid.TriggerRepeat = 3;

start(vid);

for i = 1:3
    trigger(vid);
    pause(0.2);
end

stop(vid);
delete(vid);

After using many different configurations with MATLAB I ended up trying to do the same in C++ using the pylon API and this time it worked:

#include <pylon/PylonIncludes.h>
#include <pylon/gige/BaslerGigEInstantCamera.h>

using namespace Pylon;
using namespace GenApi;
using namespace Basler_GigECameraParams;
using namespace std;

int main(int argc, char* argv[]) {
    int exitCode = 0;

      Pylon::PylonAutoInitTerm autoInitTerm;

  CGrabResultPtr ptrGrabResult;

      try {
      CDeviceInfo info;
      info.SetDeviceClass("BaslerGigE");
          info.SetSerialNumber("CameraID");

          CBaslerGigEInstantCamera camera( CTlFactory::GetInstance().CreateFirstDevice(info));

    camera.Open();

    camera.TriggerSelector.SetValue(TriggerSelector_FrameStart);
    camera.TriggerMode.SetValue(TriggerMode_On);
    camera.TriggerSource.SetValue(TriggerSource_Software);
    camera.ExposureTimeRaw.SetValue(100000);
    camera.LineSelector.SetValue(LineSelector_Out1);
    camera.LineSource.SetValue(LineSource_ExposureActive);

    camera.StartGrabbing();

    for(int i = 0; i < 3; i++) {
      camera.ExecuteSoftwareTrigger();
      Sleep(200);
    }

    camera.StopGrabbing();
    }
    catch (GenICam::GenericException &e) {
        cerr << "An exception occurred." << endl
        << e.GetDescription() << endl;
        exitCode = 1;
    }

      cerr << endl << "Press Enter to exit." << endl;
      while( cin.get() != '\n');

      return exitCode;
  }

What am I doing wrong in MATLAB? How can I get the correct trigger signal (same as from pylon API)?

P.S.: I tried MATLAB 2013b and 2014a

[Van Khuyen Bui]

Hey, I am a new guy in machine vision. I find your C++ prog is really helpful. I try to run but not successful. The program did not realize my camera. My camera is Basler ac640-90gc and i can use that with other program. Can you tell me why? The error: No device is available or no device contains the provided infor properties. Thank you so much