FT232R for RS-485 (DMX512) with Isolation - TX Optocoupler
Your question does not complete the required design margin stackup tolerance analysis to be certain if 470 is the correct resistance to ensure adequate margins for logic levels to be reliable.

The low level Tx driver impedance  Rol= 300 Ohms (max) = Vol (0.6max) /Iol(2mA)

A far better design choice is the TLP116A Schmitt-Input Logic-level output OptoIsolator from Toshiba and much cheaper than the Broadcom Ltd (nee HP) parts.

But this does not address the larger system level communication issues suggested by your missing DMX512 interface specs.