janitza UMG 512-Pro, User Manual And Technical Data

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8.4 Bus structure
·All devices are connected in a bus structure
(line).
·Each device has its own address within the bus
(see also Programming parameters).
·Up to 32 nodes can be connected together in
one segment.
·At the beginning and end of a segment, the
cable must be terminated with resistors (bus
termination, 120 Ω, 1/4 W).
·If there are more than 32 nodes, repeaters (line
amplifiers) must be used to connect the individu-
al segments.
·Devices with bus termination switched on must
be powered.
·It is recommended that the master be placed at
the end of a segment.
·If the master is replaced with the bus termination
switched on, the bus is out of operation.
·If a slave with bus termination switched on is
replaced or is without voltage the bus may be-
come unstable.
·Devices that are not involved in the bus termina-
tion can be replaced without the bus becoming
unstable.
Fig. Bus structure
Slave Slave Slave
Slave
Slave Slave Repeater
Slave Slave Slave Slave
Master
Power supply necessary
Bus termination on
T
T
T
T
T
INFORMATION
CAT cables are not suitable for bus wiring. Use
the recommended cable types for this.