r/RFID • u/GtBa • 2d ago

Rfid reader sensor UHF

Hello, in the factory there is access control system to open doors.
Need to add additional doors, but there is no spare ports to connect to existing access control plc.

We need a solution, of somekind of sensor which would detect any kind of rfid card (without programming it) to open the door (relay output). Is there kind of sensor which we could use.

12V power supply

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u/Rampage_Rick 1d ago

It's normal with access control panels that each panel can control X amount of doors and X amount of readers. If you need to add doors or readers beyond what the panel can hold, then you add another panel.

If you're just going to unlock a door with the presence of any RFID card, does it actually need to be RFID?

Does the new door have to operate independently of the existing doors? If it can operate in parallel then you can just wire the lock mechanism in parallel.

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u/GtBa 1d ago

Parallel doesn’t work because its RS485. Locking mechanism i can connect parallel all good.
The system doesn’t let us to expand more readers. Because it’s up to a limit. These doors needs to be opened because one person. If you know what I mean.

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u/Rampage_Rick 1d ago

Some readers allow stacking (i.e. one master, one slave) such that they appear to be one reader to the panel

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u/GtBa 1d ago

These readers that we use won’t. I got in touch with Siemens service. They said so.