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    VTO4202F-MR RFID not working

    Hi, I have a problem with my VTO4202F series intercom (VTO4202F-MR module). No matter which 13.56 Mhz keycard or tag I present to the reader (Mifare S50), nothing happens! There is no sound. When I try the "Issue Card" function within the VTO web interface, none of the cards is recognized. I...
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