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PAGE 28 of 68 VX2200 TECHNICAL MANUAL VER1.5

Audio Telephones (3171, 3172 & 3176)

The Art.3171 is a digital intercom based on the “2 Wire BUS”, it includes a door-open button and a service

button plus an electronic call tone with a 3 level volume control which can be adjusted by the user. Internally,

the intercom has an 8 way dip-switch to set the PHONE ID, terminals for connecting to the bus and other

functions and a trimmer (VR1) to adjust the microphone volume. It is possible to connect up to 180 intercoms

on the same bus. The same address can be given to a maximum of 3 devices (for applications that require

more units in the same apartment). The door-open push is also the “call to concierge” (if present), while the

“” push button shorts terminals “SW SW” (Max 30Vac/dc 200mA) when pressed.

The Art.3172 is the same as the Art.3171 with the addition of a privacy switch.

The Art.3176 is similar to the Art.3172 but the privacy function is activated by pressing

. It is signalled by

the red led “privacy on” and its duration is set on the 3 way dip-switch (housed inside the intercom). The

Art.3176 doesn’t have the service push button but it has a green “door open” led to give the user a visual

indication of whether the door is open or closed: to use this service, an additional wire is required from a

door contact to the intercom.

All 3 models of intercoms allow the connection of an optional relay board Art.402, for the activation of an

external sounder instead of the internal one: the board is housed inside the intercom, connected to the JP2

(red wire on “+” side) and the JP1 jumper (normally on A position) must be moved to the “B” position.

3171 3172

3176

FUNCTION

L Bus

- 0V

LB Local door bell

(Switched 0V)

AL Alarm input

(Switched 0V)

SW One side of

service button

SW Other side of

service button

JP4 Number of rings

Right =3

Left = 6

FUNCTION

L Bus

- 0V

LD- 0v connection of

door open LED

LD+ 12Vdc connection

of door open LED

LB Local door bell

(Switched 0V)

AL Alarm input

(Switched 0V)

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