6
4.
Connecting the sensor via RS485 to the controller DEGA UPA III/UDA III
1.
Installation of wiring for RS485
Wiring must be done using bus topology and according to the RS485 principles.
Maximum number of connected transmitters per controler channel is 16 (may be less depending on the configuration of the
controller), while the total length of the connecting cable (electrical distance between the controller and the last transmitter)
should not exceed 1200 meters. Due to voltage disposals caused by each transmitter, the maximum addition of distances must
be L1+L2+L3+…+L16
:
Cable type
NBx-CL III NBx-IL III
NBx-EL III
NBx-SL III
Shielded 4x0,8mm 2,1 km
2,9 km
4,2 km
2,1 km
Shielded 4x1mm
3,3 km
4,4 km
6,5 km
3,3 km
Shielded 4x1,5mm 6,2 km
7,3 km
11,6 km
6,2 km
Shielded 4x2,5mm 10,1 km
13,5 km
20,1 km
10,1 km
Selecting the appropriate type of cable depends on the fire report and the protocol for determining external influences.
2.
Setting the RS485 adress of the transmitter
Each transmitter must have a unique adress within the entire bus, otherwise there will be
communication collisions and malfunctions.
The transmitter adress can either be set internally using the DegaConfig program or using the
DIP switch on the PCB.
If the position 6 (labeled ADD) is in the ON position, then the adress according to the setting
of pins 1-5 is considered. Otherwise the adress set in DegaConfig is considered.
The adress can be set from range 1-31 using binary values. A table with DIP settings for
individual adresses is listed in the attachment "Chart for setting the transmitter adress"
3.
Terminating resistor
According to the RS485 specifications, the last device on the bus must be ending with a terminating
resistor 120R. Plug a jumper on the JP2 connector of the last device on the bus to include the 120R
terminating resistor. In the default configuaration the jumper connector is not plugged.
