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The last digit on the PanelView Standard 2711-B6C9 part number indicates that it has one RS-232 port that supports only serial printing, and one RS-232 port that supports only DH485 protocol.
To download to it, you need some kind of DH485 protocol interface on RS-232. In general, the most straightforward one is the USB/DH485 converter, 1747-UIC or an purpose-built equivalent.
A general purpose RS-232/USB converter, even the A-B branded one, cannot run the DH485 protocol and will not work with this specific terminal.
If the terminal has v3 or later firmware, it can use the Flash card slot to connect to removable media for copying runtime applications to and from the terminal.