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PRS-UM-PPSM-EN-Rev.03-10.04.2020
4.5 PPS Series Detectors Connections
Prosense PPS series detectors has onboard RS485 Modbus serial communication module. The
board has 4 ports thus the detector connection should be made by 4 wire that 2 for power and 2
for RS485. The total lenght of the connection line should not exceed 1000 meters.
Diagram 13:
PPS series detector board
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
< 50pF/m and nominal impedance 120 Ohms.
Detectors will be wired in daisy chain (bus) mode. We recommend not to use star mode connection
due to negative impact of interference. Each detector should have uniqe 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:
DIP Switch to set detector address
V+ A B V-
Detector connection pins
