2N Door intercom 2N Helios - Manual, 1322 v3.0 - Manual (Page 25)

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2.3 Electrical Installation
Compatibility
2N® Helios is designed for conventional, analogue telephone lines and works
regardless of polarity and line parameters.(Refer to the Technical Parameters) and
uses tone (DTMF) or pulse dialling to be programmed. Normally, it is connected to a
PBX line however It can also be connected to an analogue line or the GSM interface
providing a wireless installation.
Connection to Telephone Line
Connect 2N® Helios simply using LINE terminals. The advantage is that 2N® Helios
requires no power supply because all power is fed from the telephone line – except for
the button backlight and electric lock, if connected. Nevertheless, 2N® Helios can
work without these circuits too and sends an acoustic signal on having been connected
to a line (or after having been disconnected from the line for a defined period of time).
Printed Circuit Board (PCB) Description
Explanatory notes to the figure:
1. Terminal board
2. Left button connector
3. Display connector (for version 10 only)
4. Voice memory
5. One-chip Hands-Free telephone
6. Switch 2 connector
7. Keypad backlight connector
8. Connector for non-standard functions
9. Microphone connector
10. Keypad connector
11. Extension unit connector
12. Serial number
13. Main microprocessor
14. Configuration jumper block
15. Right connector
16. Jumpers
17. Camera connector
18. Camera setting jumpers
19. Loudspeaker connector and panel grounding