The Speed can be specified with any number. Actually, the serial port driver may not reflect your speed.
Flow control can be configured in the following:
Xon/Xoff ... Software flow
RTS/CTS ... Hardware flow(RTS/CTS)
DSR/DTR ... Hardware flow(DSR/DTR)
none ... No flow control
Note: If Data is 7 bit, the XMODEM, ZMODEM, B PLUS and Quick-VAN protocols are disabled. If Flow control is Xon/Xoff, the XMODEM and Quick-VAN protocols are disabled.
Note: The "hardware" prior to version 4.104 applies to RTS/CTS.