DoorBird D21 Série Manuel D'installation page 16

STEP 7: CONNECTING THE DEVICE
It is possible to connect the cables and wires to the device conveniently and
safely via labelled connection ports. You can connect all necessary cables
and wires to the device now. Please remove any cables and wires from the
connection ports of the device that you do not need. Remove about 5 mm of
insulation material at the end of the wires that you would like to connect to
the green screw connection terminal of the device.
Please take care when connecting the cables and wires. Connecting
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the cables and wires the wrong way may damage the device. Wires
without insolation material must not protrude out of the green screw
connection terminal, it may lead to electrical short and damage the
device.
The yellow, green, and red cables that lead out from the side of the
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Main Electrical Unit must only be used to connect components
certified by Bird Home Automation.
Handle the front plate with care. The surface of the front plate could
be scratched or otherwise damaged if handled without care.
You can use the nylon cord to
temporary fix the front plate to the
mounting housing (backbox) while
connecting the cables and wires to
the device.
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