Sunix Universal PCI/PCI Express Industrial Multiport Serial Cards, RS-232/422/485 user manual
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SUNIX NCCI Co., Ltd.
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4. Click “Defaults” button for restoring default advanced settings.
5.Check/Un-check the “Enable 64 Byte FIFO buffers” checkbox to enable / disable the hardware FIFO buffering feature or you can select the size of FIFO if “Use FIFO buffers control” is enabled.