Installation Technical Manual
50 04045376 - 05/2016 Kaba access manager 92 30
5.7.5.4 Bus termination
Below the RS-485 terminal, there is a jumper for setting the RS-485 terminating resis-
tor.
The selection of the terminating resistors depends on the connection architecture.
Bus with one root
The first device of the bus (access manager 92 30) and the last device of the bus
(reader 8) need a 120-ohm terminating resistor.
Bus with two roots
The last device of the first root and the last device of the second root need a 120-
ohm terminating resistor.
Star wiring
The example shows a star-type reader connection with 8 branches. The access man-
ager requires a 120-ohm terminating resistor. All readers require a 4.7-kOhm termi-
nating resistor.
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