Queries/sets the Data Terminal Ready (DTR) status

Syntax COM_DTR(<nComPort>,[<lNewDTRStatus>]) --> lOldDTRStatus Arguments <nComPort> Designates the port (1 to N) on which DSR is tested. <lNewDTRStatus> Designates the status of DTR. .T. designates that the DTR signal is active, and .F. designates that the signal is inactive. If the parameter is not specified, CA-Clipper Tools does not affect the DTR exit signal. Returns The returned value corresponds to the DTR signal status prior to the new setting, or in the absence of <lNewDTRStatus>, the returned value corresponds to the current DTR. A return of .T. indicates that the DTR is active (MCR bit 1 = 1). A return of .F. indicates that the DTR is inactive (MCR bit 1 = 0). Description COM_DTR() queries the DTR signal status. If the second parameter is not supplied, the DTR signal status does not change. Note The COM_CLOSE() function resets DTR (to inactive). By contrast, COM_OPEN does not automatically make DTR active! Example A COM_OPEN() does not set the DTR signal. You must specifically set the DTR signal. nBuff_size := 4000 // 4000 byte buffer lComOk := COM_OPEN(1, nBuff_size) // Open COM1 IF lComOk COM_DTR(1, .T.) // Activate DTR Port 1 * ... ENDIF