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Extended Functions
Some communications functions can be called for a device by using the EscapeCommFunction function. This function sends a code to direct the device to execute an
extended function. For example, an application can suspend character transmission
with the SETBREAK code and resume transmission with the CLRBREAK code. These
particular operations can also be started by calling the SetCommBreak and ClearCommBreak functions. EscapeCommFunction can also be used to implement manual modem control. For example, the CLRDTR
and SETDTR codes can be used to implement manual DTR (data-terminal-ready) flow
control. Note, however, that an error occurs if a process uses EscapeCommFunction to manipulate the DTR line when the device has been configured to enable DTR
handshaking, or the RTS (request-to-send) line if RTS handshaking is enabled.
The DeviceIoControl function enables a process to send an extended function code directly to a
specified device driver, causing the device to perform a given operation. DeviceIoControl gives a device associated with a communications resource capabilities not
supported by the standard serial communications functions. It enables an
application to configure a device using parameters unique to that device as well as to
call any device-specific functions.
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