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# What does each input line action do on the Inputs tab?

Use the Input line action settings to configure what action the reader will take. By default, the reader does not respond to a signal over input line 1, 2, or 3. Only Input lines 0 and 1 can be used for the trigger signal.

The Input line actions Train Code, Optimize Brightness, Train Match String, Read Configuration Code, and Tune are carried out only after the next trigger.

You can configure the reader to take any of the following actions:

- Trigger On and Trigger Off are enabled by default on the same input line. Trigger Off is automatically the inverse of Trigger On. If you put the two signals on separate lines you can set the polarity independently as it suits your needs.

- Encoder means that you connect your Encoder to this input line.

- Encoder Direction

- Train Code means that the reader is trained with the expected symbology, which can decrease the time required to decode successive symbols.

- Optimize Brightness means that the reader finds the best possible light and imager settings to read a code.

  NOTE: Optimize Brightness does not work if one RoI dimension is smaller than 144.

- Train Match String means that the decoded code will be the one against which successive codes are matched and validated.

- Optimize Focus (for readers with liquid lens only) means that the reader finds the best possible focus settings to read a code.

- Read Configuration Code means that the reader should consider the code to be read not as an image but as a configuration command, thereby decreasing trigger count and not producing a NoRead image.

- Tune means that the reader finds the best possible settings to read a code.

  NOTE: Tune does not work if one RoI dimension is smaller than 144.

- Allow Buffered NoRead Images means that when this input is active and connected to a sensor that detects a package, the reader buffers NoRead images. This is useful, for example, if you want to see why there were NoRead images.

- Clear Outputsmeans that if this action is set, all outputs are reset immediately if the input gets triggered. This option does not reset any output delay settings.

- Polarity means that if polarity is set it causes a change in signal that triggers an image acquisition

- Debounce Delay means that it is defined how long the trigger signal must be detected in order to be recognized as valid.

Note: DM070,DM150,DM260