xOn
#include <Serial.h>
typedef struct SerShk { Size Offset Description char fXOn; 1 0 XOn/XOff output flow control
char fCTS; 1 1 Clear to Send hardware handshake
char xOn; 1 2 XOn character
char xOff; 1 3 XOff character
char errs; 1 4 Errors resulting in abort
char evts; 1 5 Status changes that cause events
char fInX; 1 6 XOn/XOff input flow control
char fDTR; 1 7 Data Terminal Ready input flow
control
Notes: This structure represents the contents of the flags parameter in the
SerHShake procedure and addresses the input and output drivers as identified by the call's refNum field. It is used to set handshaking and
control parameters as follows:
Output flow control is enabled when fXOn is set, disabled when cleared to
zero. The same holds true for FInX (as regard input flow control. The xOn
and xOff fields specify XOn and XOff characters for flow control. Setting
the fCTS enables the Clear to Send (CTS) hardware handshake.
The errs field shows the values:
parityErr (16) set if a parity error has occurred
hwOverrunErr (32) set in the event of a hardware overrun
error
framingErr (64) set in the event of a framing error
Any one of these errors will cause input requests to abort.
The evts field shows whether or not changes in Clear to Send or Break
status will make the Serial Driver post a device driver event as follows:
ctsEvent (32) set if Clear to Send change will post an event
breakEvent (128) set if Break status change will post an event
Your applications can use these constants to set or test the value of the
evts field but we're warned against it because posting events disables
interrupts for an inordinately long time.