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# Acquisition works fine. But when the trigger signals are provided by external device, no image is triggered.

## Question

What should I do if no image is triggered (although acquisition works fine) when the trigger signals are provided by external device?

## Possible Causes

- Cause 1: Certain trigger mode is not activated, or the rigger source is incorrectly selected.

- Cause 2: External device wiring error.

## Solutions

For Cause 1, check if the camera trigger mode of the current application scenario and the related line input is normal.

For Cause 2, make sure that the wiring of the external device is normal.