Two Readers, Two Entities, One Parking Gate

I have a customer who has a parking garage where the main entrance is shared by both retail and condo residents. At this point the HID reader that the parking company uses is in place and as residents move in and out of the building, the parking company must update their database. The no longer want to have to do that and would like to add a separate access control system, and add a reader to the same gate arm. So in summary, two readers both controlling the opening up of a single parking garage arm.

Question is, do you know of any devices that handle this well? I’d think there are some back voltage issues but I am not quite sure, including if this scenario is even possible.

Thanks for any help you can provide.

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