2N Door intercom 2N Helios - Manual, 1322 v3.0 - Manual (Page 28)

28
Description of Terminals
GND This terminal protects 2N® Helios against static electricity damage.
SW1
Switch 1 designed primarily for electric door lock control.
LIGHT
These two terminals are connected to the 12V power supply with arbitrary
polarity. The power supply can feed the electric lock too.
LINE
These two terminals are connected to the analogue telephone line with
any polarity.
VIDEO
- Video signal output – used only if a camera unit is included. The coaxial
cable is connected with an internal conductor to +, with shielding to -.
+
Description of Jumpers
Connector (8)

Here connect the current call indicator (LED).

Write-protection (if the jumper is mounted).

do not connect

Microphone sensitivity reduction (mount the jumper for noisy
environments).
Camera setting – connector (18): refer to the instructions enclosed to the camera
unit.
Parallel Connection
Parallel connection of multiple telephone sets was commonly used in the era in
which telephone lines were rare, It carries unnecessary risks to connect the unit in this
way. It is in no case recommended to connect 2N® Helios in parallel to another
telephone or another 2N® Helios door communicator. It is neither admissible to use
equipment that switches one line between two or more sets (intelligent double branch,
etc.).