RS485 BUS
It is important that the RS485 data bus wiring network is connected in one continuous “daisy-chain” from
the Interface through the Master and all Slave Bases installed on the scheme…
Note: the first and the last units (this could be any type depending on site layout) connected on the RS485
bus must have an end of line (EOL) Jumper fitted – see section 10 for details.
IMPORTANT: the RS485 data bus must not be split into multiple legs from a mid-point in the wiring and
small groups of devices should not be spurred off at any point in the network...
POWER BUS
On large installations with multiple Slave Bases and/or a bus cable length exceeding 100 metres it will be
necessary to fit additional PSU’s at remote points in the building…
If the voltage on a Slave Base gets down to 8V DC then an additional PSU will be required for any units
connected beyond this point. Do not common the 12V line between multiple PSU’s.
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