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# What are the trigger types?

- Presentation triggering continuously scans for a symbol and decodes it each time one is detected. A presentation trigger relies on a timing mechanism and motion detection internal to the reader.

  You can specify several parameters in Presentation mode, such as whether the reader will read the same code more than once or how long to wait before scanning for the next code.

  In presentation mode, use the Automatic Exposure settings to have the reader determine the best exposure settings for a desirable level of brightness in the image. Be aware, however, that the reader uses the initial images it acquires to determine these settings, and might miss images containing a symbol for decoding. You can switch to Manual Exposure settings and specify a precise setting for the imager exposure.

  - Dock the device into the base station.
  - Switch to Manual trigger mode in the Setup Tool, then switch back to Presentation mode.
  - Scan the Enter Presentation Reader Configuration Code.

- Manual triggering begins acquiring images in response to any of the following events:

  - Pushing the physical button on the reader

  - Sending the DataMan Control Command (DMCC) trigger when connected to the reader over a serial, Ethernet, or wireless connection

  - Clicking the Trigger button in the Setup Tool

  - Pressing Ctrl+T from the keyboard when the Setup Tool has the focus

  The reader continues to acquire images as long as the signal remains active and stops when a symbol is found and decoded or the trigger signal ends.

Note: DM8050, DM8070, DM8600, DM8700, MX-1000, MX-1500