Table of Contents
Advertisement
It is possible to use 4-20 mA output with other output options at same time. The detector
power connections are located on main board and this connection must be done in any case
4-20 mA Output:
even 4-20mA analogue output is not used
The default configuration provides single 4-20mA signal output. Prosense detectors can be
connected to control panels on the market having 4-20mA input signal. Signal wiring from
detector and the control panel should be carried out by shielded cables. Wires cross section
depends on the distance between the control panel and the detector. The details given in
power cabling are valid as well for signal output. We recommend to use values given in table 4
(see page 13) as cabling best practices. Please avoid any interruption in case any junctions on
wires. The shield is to be grounded from the control panel side only and never connect the
shield to the detector. Please make sure clutching or crimping apparatus are not loosen or
oxidized.
RS485 Serial MODBUS Output:
PC3 Series detector has onboard RS485 communication feature and RS485 MODBUS
connections are located onboard on a separated socket. The detector connection should be
made by 4 wire that 2 for power and 2 for RS485. The total length of the connection line
should not exceed 800 meters. The wiring for detectors utilized with RS485 board should be
done by using connection cable EIA RS485 2 core wires with section 0.22 / 0.35 mm2 and
shielded. Nominal capacity between the wires should < 50pF/m and nominal impedance is
120 Ohms.
Detectors will be wired in daisy chain (bus) mode. We recommend not using star mode
connection due to negative impact of interference. Each detector should have unique address
number in the chain. The detectors would not be recognised by control panel if same address
given to them. The address of detector can be adjusted via using DIP-Switch set on the board:
PRS-UM-PC3-EN-Rev.04-06.2020
Port
Usage
V +
Power input (+) 12VDC – 24VDC
V -
Power input (-)
S
Current Output Signal (4mA – 20mA)
Table 5: Detector 4-20mA output ports and their usage
Port
Usage
V +
Power input (+) 12VDC – 24VDC
V -
Power input (-)
A
MODBUS RS485-A
B
MODBUS RS485-B
Table 6: Detector RS485 output ports and their usage
14
Advertisement
Table of Contents
