The following parameters specify the control characters used for XON/XOFF flow control. The default settings are nearly always used by host computers for XON/XOFF flow control; you are unlikely to need these keywords in your remote characteristics string.
Parameter  | 
Default  | 
xonchar CONTROL_CHAR  | 
CONTROL_CHAR= \^Q  | 
xoffchar CONTROL_CHAR  | 
CONTROL_CHAR= \^S  |