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TRS3243E: TRS3243E What to do with unused RIN and DIN?

Part Number: TRS3243E

Hi there,

I am using this device to translate RS232 signal levels to control status LEDs, however I am not using all the RIN and DIN. My question is: Is there a standard configuration for unused pins - open, tie to GND or tie to VCC?

Thank you,

-Jeremy