Connection Of Transmitters Via Rs485 Bus - DEGA UDA III User Manual

Connection of transmitters via RS485 bus

The transmitters can be connected to the control panel via a digital RS485 bus. The control panel has 8 independent RS485
lines. All transmitters can be connected to one line, but it is recommended to balance the transmitters on multiple lines due to
power loss on the wires.
It is possible to use two ways of connection:
1) Bus topology (BUS) - transmitters are connected to the bus, which is connected to one line on the control panel. Up to
8 independent buses can be created. The control panel can be connected anywhere on the bus. If the cable is
interrupted, communication with all transmitters located behind this interruption will be lost.
2) Circular topology (LOOP) - the beginning of the bus is on the control panel (BUS0 or BUS2) and the connected
transmitters follow. The bus termination is again on the control panel in BUS1 or BUS2). Therefore, 2 independent
circuits (BUS0-BUS1 and BUS2-BUS3) are used. The advantage of this solution is that in the event of a cable break in
one place, there will be no loss of communication with any transmitter.
Figure 5 Bus topology
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