Rockwell Automation 2755 AdaptaScan Software - Manual (Page 193)

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Publication 2755-838
Dynamic Data Exchange can also occur through devices connected
to an AdaptaScan RS-232 serial port. DDE through the serial port
functions the same as with the configuration cable (connected to
programming connector). To use DDE, make sure you select DF1
and enable Scanner Protocol. Shown below is an example of the
serial port setup should appear. Make sure the communication
parameters of the host device match the AdaptaScan serial port.
DDE Through the
AdaptaScan RS-232 Port