I_SetSerialXOff
This command causes the serial port to send an XOFF character. A value of kOTSerialSendXOffIfXOnTrue causes it to be sent only if the endpoint is in the XON state (that is, if the last input flow control character sent was XON), while a value of kOTSerialSendXOffAlways unconditionally sends the character. The following line of code unconditionally sends an XOFF character:
OTIoctl(theSerialEndpoint, I_SetSerialXOff, kOTSerialSendXOffAlways);Sending the XOFF character unconditionally is equivalent to using a serial driver control call with acsCode
value of 26, and sending the XOFF character when an endpoint is in an XON state is equivalent to using acsCode
value
of 25.
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