Sensitron S2398CO, Инструкция по эксплуатации

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Pag. 15
3.3 Detector output connection
The connection of SMART P to RS485 bus lines should be performed by using a 4-wire cable,
1 pair for the RS485 bus and 1 for the power supply. It is also necessary that:
³
Wiring between the detectors and the control panel should be made by using con-
nection cable EIA RS485: 2 core wires with section 0.22 / 0.35 mm2 and shield (twisted
pair). Nominal capacity between the wires <50pF/m, nominal impedance 120 Ω. These
features can be found in BELDEN cable 9842 or similar (data transmission cable in EIA
RS485).
³
Using this wiring, the total length of the line should not exceed 1000 m.
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Detectors and output modules are to be wired in daisy chain mode. We recommend
avoiding star or tree mode connection as interference immunity would be reduced.
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Make sure that a 120 Ω end line resistor is placed at the beginning and at the end (on
the last detector or output module) of the bus line by closing JP10 on the base board.
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For the detectors’ power supply connection, we recommend using a 2-wire cable with
suitable section according to the distance and number of detectors.
³
Once the installation has been completed, verify that each detector reaches at least
12 Vdc.
Each SMART P detector connected on the unit line must have a univocal address. Use the
STS/CKD+ or STS/CKD-OLED keypad to set the detector address. See the specific manual for
further details.
Figure 3) Detector connection to RS485 bus lines
A
B
+
-
A
B
+
-
A
B
+
-
STG/OUT16 Module
+ - A B
+ - A B
+ - A B
++ AA BB --
Note: if the detector (or the module)
is the last of the line, close the
120 Ohm jumper
To the next detector (*)
From the control panel