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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, and Read Configuration Code 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.

- 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 you can buffer even NoRead images if you want, for example, to see why you had NoRead images.

- Clear Outputs means 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.

  NOTE: If Clear Outputs is set for one of the inputs, and a Read action is set on the Outputs tab for one of the outputs and the Pulse Width width for this output is set to a non-zero value, the output will still be on until the end of the set pulse width time whether or not the input is activated within the set pulse width time.

- 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: DM300