Bus Structure - janitza JFTF-I Funktionsbeschreibung

Bus structure

• All devices are connected in a bus structure (line) and each device has its own address within
the bus.
• Up to 32 stations can be interconnected in one segment.
• The cable is terminated with resistors (bus termination, 120 ohm 1/4 W) at the beginning and
end of a segment.
• If there are more than 32 stations, repeaters (line amplifiers) must be used in order to connect
the individual segments.
• Devices with activated bus termination must be supplied with power.
• It is recommended to set the master at the end of a segment.
• The bus is inoperative if the master is replaced with an activated bus termination.
• The bus can become unstable if the slave is replaced with an activated bus termination or is
dead.
• Devices that are not involved in the bus termination can be exchanged without making the
bus unstable.
Master
T
Slave
Slave
T
Slave Slave
Slave Slave
Slave Slave
Power supply necessary
Bus terminator on
Slave
Slave
Fig. Diagram of bus structure
FBM-Serie
T
Repeater
T
25