UNC100 Hardware Manual V1.4
RBH Access Technologies Inc.
Page
26
of
36
OSDP
Open Supervised Device Protocol (OSDP) is an access control communications standard developed
by the Security Industry Association (SIA) to improve interoperability among access control and
security products.
RBH is using this protocol for interfacing one or more Peripheral Devices (PD) to a UNC-100.
The protocol implementation is over a two-wire, multi-dropped, serial communication channel, such as RS-
485. The physical interface is Half-duplex RS-485- One twisted pair, shield/signal ground. Signaling uses
8 data bits, 1 stop bit & no parity bits
OSDP Reader connection
OSDP Readers (
RBH Blue-Line
) can be connected in daisy chain or in star configuration. Star configuration
will reduce the communication distance over RS-485.
Locks should be powered from separate power supply.
The communication over OSDP can be encrypted/unencrypted based on the UNC-100 settings & the
capabilities of the PD (OSDP Readers).
The secure communication uses AES-128 bit encryption
. Key for secure communication setup is pre-
set in UNC100 & PD. In case these keys do not match, secure channel is not set up, in that case the PD has
to be updated for the key.
UNC-100 addresses up to eight OSDP readers with address 1 to 8. For secure communications, every PD
has unique key. This key is generated using Master Key & ID of the PD. The master key is known only to
the UNC-100 controller. If PD is being used with the panel for the first time, Key has to be written to the
PD.