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8.5 Bus structure
In a bus structure
·all devices are connected in line.
·each device has its own address (see chap.
„12.7 Programming the parameters“ on page
38).
·up to 32 participants/devices can be
interconnected in a segment. The cable is
terminated with resistors (bus terminator, 120
ohm, 1/4 W) at the start and end of a segment.
·repeaters (line amplifiers) are used for more
than 32 participants to connect the segments.
·devices with an activated bus terminator must
be supplied with power.
Fig. Representation of a bus structure
Slave
Slave Slave Slave Repeater
Slave Slave Slave
Master
T
T
T
T
·placing the master at the end of a segment is
recommended. If the master is replaced with an
activated bus terminator, the bus is deactivated.
·the bus can become unstable if a slave is
replaced with an activated bus terminator or is
de-energized.
·devices, which do not participate in the bus
terminator, can be replaced without making the
bus unstable.
- Power supply necessary
T
- Bus terminator switched on
- e.g. UMG 604-PRO Master
- UMG 96-S2 Slave