Se�Ng The Rs485 Adress Of The Detector; Termina�Ng Resistor; Communica�On Protocol Switch Dega/Modbus; Detector Func�Ons - DEGA NS III LCD Instruction Manual

7. Se�ng the RS485 adress of the detector
Each detector must have a unique adr
ise there will be communica�on
collisions and malfunc�ons.
The detector adress can either be set internally using the DegaConfig program or using the DIP switch
on the PCB.
If the posi�on 6 (labeled ADD) is in the ON posi�on, then the adress according to the se�ng 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 se�ngs for individual
adresses is listed in the a�achment "Chart for se�ng the detector adress"
8. Termina�ng resistor
According to the RS48
with a termina�ng
resistor 120R. Plug a jumper on the JP2 connector of the last device on the bus to include the 120R
termina�ng resistor. In the default configuara�on, the jumper connector is not plugged.
9. Communica�on protocol switch DEGA/MODBUS
Plugging a jumper in the JP1 connector will sw�ch from the DEGA communica�on protocol to the
MODBUS communica�on protocol.
Detector func�ons
The detector's motherboard is equipped by status LEDs, which help in detec�ng problems during the installa�on.
LED „POW" shines at correct power
LED „TxD" flashes when transmi�ng a packet via RS485
LED „RxD" flashes when a packet is correctly recieved via RS485
LED „ERR" shines/flashes in case of malfunc�on or substandart situa�ons

1. Turning on the detector

A�er turning on the power the LED "POW" starts shining and the LED "ERR" starts flashing, indica�ng a forming sequence of
the sensor and automa�c tes�ng procedures, which can take up to 180 s depending on the sensor used. The output of the
current loop is 1 mA. During this sequence, tes�ng of internal electronics and stabiliza�on of the sensor in order to eliminate
false alarms a�er turning on, is taking place. At this �me, the display only shows the �me to the beginning of the
measurement loop.
A�er comple�on of the forma�on, a 4 mA current begins to flow on the output of the current loop and the detector starts
working according to it's se�ngs.
2. Gas detec�on
The detector con�nuously measures the detected gas concentra�on in the atmoshpere and converts it's current value into a
4-20 mA signal or transmits it's value to the evalua�on unit via DEGA/MODBUS protocol.
3. Malfunc�on
In case of malfunc�on the LCD displays the measured concentra�on, an error code and a key symbol
condi�on is indicated by the orange „ERR" LED. The meaning of each error code is included in the a�achment "Table of error
codes".
5 specifica�ons, the last device on the bus must be ending
8
ess within the en�re bus, otherw
. On the PCB this