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Diagram 8: RS485 Modbus serial communication address and switch position
The last detector in the chain should have 120 Ohm RS485 termination resistor. The resistor
is already implemented on the board by default but not activated. User should activate the
termination resistor via using the termination pin once the installation completed.
The power connection we recommend to use separate 2 wire cable with specification given
earlier in this document (see Electrical Connections section at page11). Once the cabling is
completed please check each detector has at least 12 VDC power.
15
PRS-UM-PC3-EN-Rev.04-06.2020
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