2017717_b•en•2016-11-01
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5.4 onnect hub
By using RS485 hubs, the WAREMA climatronic® bus line can be extended
or a branch line can be reached. The WAREMA climatronic® HUB 4 is
available in DIN rail-mounted or surface-mounted housing for this purpose.
The hub provides four independent outputs. It is possible to create branch
lines (e.g weather station) to reach remotely mounted bus devices or for
example to form a separate line for each level of the building.
In the WAREMA climatronic® system, a maximum of 1200 actuators,
3 weather stations and 2 sensors for insider temperature/humidity can be
used. A maximum of 200 devices are permissible in each section of the bus.
The bus must be subdivided by a hub if more than 200 devices are to be
connected.
A hub is an additional bus device that must be included in the calculation to
determine the maximum number of bus users.
A maximum of two hubs may be switched in series for the WAREMA
climatronic® bus.
A hub is not required for less than 100 devices, except for line extension.
When using 100 actuators or more, one hub is required per 100 devices.
A hub is also required after every 1200 m of bus length.
Communication from one output of the hub to another is not possible.
The 0 V wire must always be connected through all sections, bus devices
and hubs.
Bus termination
For each bus line, and also for each branch line, terminating resistors must
be provided at the start and end of the bus line, except between two hubs.
Branch lines may only be implemented with one hub.
Each branch line must be terminated with terminating resistors at the
beginning and end.
For a JY(ST)Y 4x2x0.8 mm ∅ line the terminating resistance is 120 Ω.
No terminating resistors are required between two connected hubs
(termination inside device, cf. Fig. 11).
Hub
Hub
last
bus device
Fig. 11
Bus termination
Detailed information on connecting the WAR MA climatronic® HUB 4 can
be found in the associated installation instructions art. no. 2014481.
