Technical Manual Installation
4904045376 - 05/2016Kaba access manager 92 30
5.7.5 Readers via RS-485
The RS-485 interface serves for communication with readers. The RS-485 interface
(connections A, B, C) is operated in 2-wire mode. For this connection, you may
choose a star topology or a bus topology.
In case of star wiring, an additional support point terminal needs to be provided to
allow parallel distribution of RS-485.
Example: Connection of biometric reader 91 50 and compact reader 91 10 via RS-485
interface with 12 V DC power supply from the access manager.
5.7.5.1 Connection diagram
Twisted-pair cabling is used for the lines A and B. Lines are wired one-to-one, i.e., line
A of the access manager to line A of the reader and line B of the access manager to
line B of the reader.
5.7.5.2 Shielding
The data line shielding is generally connected on both sides. For this, connect the ad-
ditional wire to connection C.
Insulate the additional wire with heat-shrink tubing to avoid short-circuits!
5.7.5.3 Line lengths
The complete bus network (master lines and stubs) may be up to 1,200 m long. One
stub must not exceed 100 m.
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