janitza UMG 604-PRO, User Manual And Technical Data, Page: 31 / 87

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UMG 604-PRO
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7. 4 Bus structure
• All devices are connected in a bus
structure (line).
• Up to 32 participants can be connected
together in a single segment.
• The cable is terminated with resistors at
the beginning and at the end of a segment.
• If there are more than 32 participants,
repeaters (amplifiers) must be used to
connect the individual segments.
• Devices for which the bus connection is
switched on must be under current.
• It is recommended that the master be
placed at the end of a segment.
• If the master is replaced with a bus
connection, the bus must be switched off.
• Replacing a slave with a bus connection
that is either switched off or de-energised
can destabilise the bus.
• Devices that are not connected to the bus
can be replaced without destabilising the
bus.
Fig. Bus structure illustration
Slave Slave Slave
Slave
Slave Slave Repeater
Slave Slave Slave Slave
Master
Speisung notwendig / power supply necessary
Busabschluß eingeschaltet / bus terminator on T
T
T
T
T