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OSDP readers and controllers

OSDP (Open Supervised Device Protocol) is a Security Industry Association standard for connecting readers to access control panels over RS-485. Unlike Wiegand it is two-way: the panel supervises the reader, controls its LEDs and buzzer, and with OSDP Secure Channel the link can be encrypted. Both ends must support OSDP. Check each datasheet for the OSDP version and for Secure Channel support.

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