Addtron Technology Electronic Device WebNet User Manual page 23

Figure 14: Configuration box for the serial lines
of bits, the N is "no parity" (alternatively "O" for "Odd" or "E" for "Even" parity), and
the 1 is the number of stop bits.
The last box determines the type of flow control – none, hardware, RS-485 or Xon/Xoff.
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WebNet User's Guide