8.Click the "Port Settings" tab and then click the "Advanced" button. The QSC(LP)-100 driver will display a custom Advanced Port Settings control, which allows the ports UART compatibility mode and FIFO threshold levels to be configured. The threshold values of full-scale for the transmit buffer and ¾-scale for the receive buffer are optimal for most applications. Note that the FIFO option for each of the QSC(LP)-100's four ports is configured independently.

QSC(LP)-100 User's Manual

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Quatech QSC(LP)-100 user manual