14
PRS-UM-DP32-EN-Rev.02-05.2019
Detectors Connections
S-DP32 Panel can be connected and monitor 32 detectors with RS485 serial connection. V+,
V-(GND), A and B ports must be connected via using four-wire cable. Detector connections
supply 27VDC power to detector and read the output signal of detector from A and B ports.
Thus connections should be made correctly to do not cause any damage on the detectors.
Detector power connection should be done with 1.5mm
2
cross section cable. The total
distance between control panel and detectors should not exceed 800 meters. Detector
connections should be made with 4 core cable wire that 2 for power and 2 for RS485 and pin
definitions are as follows:
V+
output +24VDC (Only for panel and detectors, do not use for any other device)
V-
output -VDC
A
input RS485 port A
B
input RS485 port B
Table 6: Connection pin definitions
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 be < 50pF/m and nominal impedance should be 120 Ohms.
The V+, V- ports and A, B ports are located different sockets in S-DP32 main board. These
ports are formed in same or different sockets on Prosense detector address modules. The
connections should be done with care to do not mix power and RS485 ports. All detectors
will be connected through one cable via hopping one detector to another till the last
detector on the line. The connection schema is given in Diagram 11:
Diagram 13: Panel to detector connections
There should be one master device and up to 32 slave devices in RS485 communication. The
master is S-DP32 control panel and detectors will be the slave devices:
B
A V- V+
A
B
V+
V-
Panel
S-S-
B A V- V+
V+
V-
A
B
Detector 1
Detector 2
Max 32
Detector
