Panelview 550 Comms question

I have a 5/03 connected from its RS232 port to a Panelview 550 (2711-K5A16). The Panelview is connected on its RS232 DF1 port, with another RS232 port free on the Panelview.
I want to run an EZMarquee from the the 5/03 but the EZMarquee will not run off the free DH485 port on the 5/03.
Will I have to get a Panelview 550 with a DH485 port to free up the 5/03 RS232 port?
Can I run the EZMarquee from the free RS232 port on the Panelview?
Thanks for any help.

Will I have to get a Panelview 550 with a DH485 port to free up the 5/03 RS232 port?

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Yes.

Can I run the EZMarquee from the free RS232 port on the Panelview?

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No, the AUX port on your PV is for upload/download of it's program or it can be setup as a printer port.