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   tp_reopen() - reopen serial port

   nError := tp_reopen(nPort, [nIsize], [nOsize])

   nPort       Serial port number.
   nIsize      Input buffer size, default 1536.
   nOsize      Output buffer size, default 1536.

   Reopens a serial port which was previously opened, then closed with
   tp_close(nPort, nTimeout, .T.).  Serial parameters retain the same
   values they had before the port was closed.  If DTR was enabled, it
   is left enabled as by tp_ctrldtr(1).  If RTS was enabled, it is left
   enabled as by tp_ctrlrts(1).

   Example:

       tp_close(1, 0, .T.)
       run dsz rz
       tp_reopen(1)