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Serial port handshake lines... (DTR)

Hi all,

  We are having some trouble porting a program from PC-Linux to the Etrax 
developer board. The problem is that in the PC, whenever we open the serial 
port the PC raises both the RTS (pin 7) and the DTR (pin 4) lines. But the 
same code in the ETRAX machine only raises the RTS, leaving DTR low.

   We have not found in the documentatio any reference to the DTR/DSR 
handshake lines.

  Any idea?

   Thanks a lot.

   Rafael Collantes