COM_DSR()
 Queries the Data Set Ready (DSR) status
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 Syntax

     COM_DSR(<nComPort>) --> lDSRActive

 Argument

     <nComPort>  Designates the port (1 to 4) on which DSR is tested.

 Returns

     A return of .T. indicates that DSR is active (MSR Bit 6 = 1).  A return
     of .F. indicates that DSR is inactive (MSR Bit 6 = 0).

 Description

     COM_DSR() lets you check the Data Set Ready signal within a program.

 Note

     .  If Delta-DSR is required, you must use COM_MSR().

 Example

     Many modems give an active DSR as soon as a connection is established:

     DO WHILE .NOT. COM_DSR(1)            // Wait for DSR (Call)
        * ...
     ENDDO

     ? "Call recognized."