Shenzhen Sonoff Technologies Co., Ltd.
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2.Wiring Instruction
Wiring Instruction of SPM-Main & SPM-4Relay and SPM-4Relay & the Slave Unit:
The main unit can be added up to 32 slave units (The length of RS-485 bus shall be less than 100m).
The wire connected to the main unit and slave unit must be 2-core RVVSP cable with single wire
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diameter of 0.2mm .
SPM-4Relay
SPM-Main
SPM-4Relay
RS - 48 5RS - 48 5
Out
AB
In
AB
A B
RS - 48 5
Out
AB
In
AB
Light Fixture Wiring Instruction:
100-240V AC
N1
Out
L1
Out
N2
Out
L2
Out
N3
Out
L3
Out
N4
Out
L4
Out
LIn
N In
There are 4 channels in SPM-4Relay, the first channel is designed to power the device so that
it has to be powered on; Each channel is independent, only the input end is powered on can
the corresponding output end of the channel work successfully.
Ensure the proper wiring before powering the units on.
To ensure the reliable communication of the RS-485 bus, please keep one end of the shielded
layer connecting to the ground wire and the other end hanging in the air.
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