PLC serial comm from hp Jornada720


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any body out there using an HP jornada 720 or
any handheld computer to communicate with PLC's like the "GE series 90 micro" or Siemens "TEC".
I am running the communication programs for these
two on my Jornada 720 using a DOS emulator but having problems establihing communicatins.I believe my null modem cable connections are correect,serial comm is enabled on com1 but no worky.Any suggestions?