How to receive hardware triggers multiple times using Image Acquisition Toolbox?

Hi,

I'm using an aliend vision camera. The camera is triggered by an external source. I want the camera to capture 30 frames per trigger. The trigger will repeate 200 times. And the data can be automatically logged into disk.

Here's my script:

vid = videoinput('gentl', 1, 'Mono8');
src = getselectedsource(vid);
src.ExposureTime = 8000; 
src.AcquisitionFrameRateMode = 'Basic';
src.AcquisitionFrameRate = 7.6;
src.TriggerSelector = 'AcquisitionStart';
src.TriggerMode = 'on';
src.TriggerSource = 'Line0';

vid.FramesPerTrigger = 30;
triggerconfig(vid, 'hardware', 'DeviceSpecific', 'DeviceSpecific');
vid.TriggerRepeat = 200-1;
% log
vid.LoggingMode = 'disk';
diskLogger = VideoWriter('TEST.avi', 'Grayscale AVI');
vid.DiskLogger = diskLogger;
diskLogger.FrameRate = fr;
% start
start(vid);

wait(vid, inf);

stop(vid)
delete(vid)
clear

However, this script doesn't work as my expectation. The hardware can recognize the first trigger, but then it looks like the acquistion is executed continously until it collectes 200*30 frames.

I tried to change vid.TriggerRepeat to 0 and loop the acquistion 200 times. This method works normally most of time. However, it sometimes produce an error when executing start(vid): can not set ROI. It doesn't happen every time. It just happens sometimes in the middle of the acqusition. That's why I want to use a non-zero vid.TriggerRepeat for multiple triggers, so that I only need to start(vid) once.