Symbol DS6707-DP20411ZZR - Symbol Digital Scanner DS6707-DP, Product Reference Manual

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Symbologies 10 - 35
Overfilling Transmission Buffer
The Code 39 buffer holds 200 characters. If the symbol just read results in an overflow of the transmission buffer:
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The digital imager scanner indicates that it rejected the symbol by issuing three long, high beeps.
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No transmission occurs. The data in the buffer is not affected.
Attempt to Transmit an Empty Buffer
If the symbol just read was the Transmit Buffer symbol and the Code 39 buffer is empty:
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A short low/high/low beep signals that the buffer is empty.
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No transmission occurs.
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The buffer remains empty.