Westermo MRD-3x0 - Manual (Page 159)

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None
No flow control is enabled.
Hardware
The port will use the RTS and CTS handshake lines to control
the flow of data.
Software
The port will use XON/XOFF software flow control. The
XOFF character is hex 0x11. The XON character is hex 0x13.
Both
The port will use both hardware and software flow control.
Line state when disconnected
This field determines the state of the port's RTS and DTR
handshaking lines while the port is disconnected. To set a sig-
nal active while disconnected, check the associated box.
Most equipment uses 8 databits, 1 stopbit and no parity, how-
ever, this should be verified against the reference manual for
the equipment.