COMPONENT LAYOUT
Top view
Power and RS485 bus
input terminal block
The crossed-out wheelie bin symbol illustrated indicates that this device must be collected separately from
other waste. Thus this product must not be disposed of along with municipal waste at the end of its service life.
Specific waste collection systems must be used for this type of waste or the device can be returned to the
dealer when purchasing a similar new product. By making sure this product is disposed of correctly and
avoiding improper use, you are helping prevent possible negative environmental and health impacts, since it
contains potentially hazardous substances. The product must be disposed of in accordance with current
waste disposal regulations. Unlawful disposal of this type of waste (WEEE) is punishable by fines. Unlawful
disposal of the product by the user shall result in the application of fines as laid down in article 50 and following
of Italian legislative decree (D.Lgs.) 22/1977 as amended by legislative decree (D.Lgs.) 152/06, as
subsequently amended and supplemented; and in article 16 of legislative decree (D.Lgs.) 151/05, as
subsequently amended and supplemented.
Ursula
hub
is part of the UNA Automation System
manufactured and sold by Master Srl Divisione Elettrica
Via Mario Tognato 16 - 35042 ESTE (Padova) - ITALY
Tel. +39 0429 602777 Fax +39 0429 601247
RoHS
COMPLIANT
ELECTRICAL SPECIFICATIONS
Ursula
board can be powered via the "RS485 Bus Input" terminal block.
Ÿ
Power:
from 12Vdc to 18Vdc
Ÿ
Absorbed power:
•
Absorbed power during normal operation: 0.16W
•
Maximum absorbed power (if all 5 RS485 Buses are short-
circuited): 4.5W
Ÿ
Working temperature:
from -20°C to +85°C
Ÿ
Ambient humidity:
from 0% to 85%
OPERATING TIPS
Ursula RS485 hub has been designed to:
Ÿ
Increase the number of boards connected to each other.
Bear in mind that the limit between Vesta and peripheral boards like
Eva
is 200 (for each of
Vesta
's channels).
Ÿ
Increase the distance from Vesta to the board furthest away.
Bear in mind that the maximum distance between
Vesta
and another
slave board like
Eva
is 1 km.
Ÿ
Regenerate the signal, improving communication quality.
In addition to the distance issue, further interference may be caused by
external components or it may be that the cable used is not entirely
suitable, resulting in a decrease in the possible distance.
Ÿ
Create a number of bus line branches for increased operating reliability
on each branch and have the option of isolating the bus for
maintenance purposes.
For example: if we install 100 UNA boards on a single bus branch and
the bus shorts out, none of the 100 boards will be able to communicate
with each other. If we opt instead to use a HUB RS485 to split the bus
line into a number of channels, a short-circuit on one of the 4 branches
would only disrupt communication between the boards belonging to that
branch.
These applications can be produced and/or recommended to divide
Una boards into functional groups (lighting on one branch, power on
another, etc.) or by floors/levels (one branch for the ground floor, one for
the first floor, and so on).
For further details, refer to the sample diagrams.
RS485 BUS
output
RS485 BUS
output
RS485 BUS
output
RS485 BUS
output
Ursula
Hub Bus RS485
6
7
Installation manual • ENGLISH
