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#define INCL_DOSDEVIOCTL
 
USHORT DosDevIOCtl(0L, 0L, 0x0048, 0x0001, hDevice)
HFILE hDevice;    /* device handle */
 
The ASYNC_STARTTRANSMIT function starts transmission. This function allows
data transmission to be resumed by the device driver if data transmission is
halted due to the ASYNC_STOPTRANSMIT function (0x0001,0x0047) or due to an
XOFF character being received while the device driver is in automatic
transmit flow control mode. This function is similar to the device receiving
the XON character.
 
Parameter  Description
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hDevice    Identifies the serial device that receives the device-control
           function. The handle must have been created previously by using
           the DosOpen function.
 
Return Value
 
The return value is zero if the function is successful or an error value if
an error occurs.
 
Comments
 
There may be other reasons why transmission is disabled; transmission may
not be resumed. For more information, see the ASYNC_GETCOMMSTATUS function
(0x0001,0x0064).
 
See Also
 
DosOpen, ASYNC_GETCOMMSTATUS, ASYNC_STOPTRANSMIT
 
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