Port expander and RFID switching/timing

Hello

I'm s bit new here so I apologize if I have this in the wrong area.

Im using a Uno connected to the 8:1 atlas connected to 6 rdm6300. What I'm looking to do is have the ports on the atlas switched to active for a few seconds then switch to the next port until the readers have read all 6 correct RFIDs. Each reader will only accept a certain RFID and when all have been detected at the correct location a relay is to engage opening a lock.

https://www.atlas-scientific.com/_files/code/serial_port_expander_arduino_uno_1.pdf

Any help and suggestions are appresiated.

Thanks

Flogy:
Any help and suggestions are appresiated.

Thanks

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@Flogy, do not cross-post. Other thread removed.