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(some data flows in the bus), then it will postpone the transmission of UART
until the bus is idle. Due to the reduction of TX/RX packet conflicting on
RS-485 one-way traffic bus, it will enhance better system performance and
RS-485 communication ability.
(3) Should I enable auto flow control features?
Enable Auto CTS/RTS Flow Control means the CTS/RTS flow control is
controlled by hardware automatically. System will be more stable if the function
is enabled. Please make sure your serial device and cable wiring before
enabling the hardware flow control function.
(4) How large FIFO length I should set?
FIFO (First-in-First-out) buffers are used to reduce the frequency of interrupt
processes for UART chips. The size of the buffer will determine the number of
times the cards need to interrupt the computer’s CPU in order to process a
string of data. With larger FIFO buffer size; there is more data flow and less
interruption to the CPU, therefore allowing the CPU to be free to handle other
more crucial tasks.
Set the Receive/Transmit Buffer to higher value will get faster performance
because the interrupts will be reduced, but the time for interrupt service routine
will become shorter. The receive buffer overflow will be easily happened if the
CPU speed is not enough to handle. If the system is not stable, select the
lower value to correct problems.
6.2.
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