Alphatech A-Bell-C Troubleshooting guide

A-Bell - C
A-Bell - LC
A-Bell - C/C
Bell-8
User and service manual
Version 1.0
A-Bell –Door Entry Phone
for analog telephone line

Dear customer
Congratulations to the purchase of “A-Bell door entry phone”.
This manual describes a version in the following variants with one or
two pushbuttons:
A-Bell - C - full version (Comfort)
A-Bell - C/C - full version (Comfort) with analog Camera
A-Bell - LC - reduced version (Low Cost)
Basic features of the A-Bell doorphone
30mm thin, surface mount design without necessity to cut a hole into
the wall
LED illumination of name plates
integrated analog colour camera (C)
two independent relay switches with 8 modes of setting (C)
possibility to use power supply of the electrical lock for powering the
doorphone in case of connection to some problematic PBXs (replaces
BestBox) and for modes of switches with pernament status (C)
electronic setup of loudness without necessity to open the front cover
adjustable detection of tones for line hang up or repeated calling
integrated RTC circuit of clock - automatic day/night switching (C)
programming via DTMF telephone or via USB cable from PC
24-digit lenght of telephone number including * # Flash and Pause
(C) –full version only (Comfort)
Manual version V1.0 14.9.2011
ALPHATECH TECHNOLOGIES s.r.o.
Jeremenkova 88
140 00 Praha 4
CZ
www.alphatechtechnologies.cz
[email protected]

Contents
1BASIC DESCRIPTION....................................................................................... 6
1.1 FEATURES...................................................................................................... 6
1.2 TERMINOLOGY............................................................................................... 7
1.3 VERSION OF A-BELL DOORPHONE AND DIFFERENCES .................................... 8
1.4 MODELS OF A-BELL DOORPHONE .................................................................. 9
1.5 PCB SCHEMATICS ........................................................................................ 11
2INSTALLATION............................................................................................... 14
2.1 ASSEMBLY OF A-BELL DOORPHONE ............................................................ 14
2.1.1 Dismounting of the front cover of A-Bell................................................ 14
2.1.2 Wall mounting of A-Bell.......................................................................... 14
2.1.3 Replacement of name plates.................................................................... 15
2.1.4 Demounting and mounting of pushbutton in the front panel................... 15
2.1.5 Closing the front cover of A-Bell ............................................................ 16
2.2 INTERCONNECTION OF TWO MODULES ......................................................... 16
2.3 CONNECTION ............................................................................................... 17
2.4 CAMERA (VERSION /C ONLY)....................................................................... 21
2.5 OTHER ACCESSORIES ................................................................................... 22
2.5.1 TimeRelay ............................................................................................... 22
2.5.2 DistyBox.................................................................................................. 22
2.5.3 Power supply 12V................................................................................... 22
2.5.4 USB programming cable......................................................................... 23
2.5.5 BlackBox................................................................................................. 23
3OPERATING THE UNIVERSAL DOORPHONE......................................... 24
3.1 SIGNALLING OVERVIEW ............................................................................... 24
3.2 VISITOR AT THE DOOR ENTRANCE................................................................ 25
3.1 PERSON INSIDE THE BUILDING...................................................................... 28
3.1.1 Outgoing call .......................................................................................... 28
3.1.2 Incoming call .......................................................................................... 29
4PARAMETERS PROGRAMMING ................................................................ 30
4.1 PROGRAMMING BY PHONE ........................................................................... 30
4.1.1 Entering into programming .................................................................... 30
4.1.2 Parameters programming....................................................................... 30
4.2 PC PROGRAMMING –BELLSET PROGRAM .................................................... 31
5DESCRIPRION OF PROGRAMMABLE PARAMETERS.......................... 32
5.1 DIRECT NUMBERS DIAL –MEMORIES............................................................ 32
5.2 RELAYS........................................................................................................ 33
5.3 BASIC PARAMETERS..................................................................................... 37
5.4 TIME PARAMETERS....................................................................................... 39

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5.5 SYSTEM PARAMETERS.................................................................................. 42
5.6 HANDSFREE PARAMETERS SETTING............................................................. 45
5.7 TIME PROGRAM –AUTOMATIC DAY/NIGHT SWITCHING (C)...................... 48
5.8 DEFAULT SETTTING AND ERASING ............................................................... 50
5.9 PROGRAMMING TERMINATION ..................................................................... 50
5.10 OVERWIEV OF PARAMETERS ........................................................................ 51
6TECHNICAL PARAMETERS......................................................................... 55
6.1 ELECTRICAL PARAMETERS........................................................................... 55
6.2 MECHANICAL DIMENSIONS .......................................................................... 55
7TABLE FOR EASY PROGRAMMING.......................................................... 56

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1Basic description
1.1 Features
voice communication is powered from the telephone line only
pulse and tone (DTMF) dialling
two 24 digit numbers can be stored for each pushbutton (including *,
#, Flash and pause)
expansion by Bell-8 module up to 98 pushbuttons (under
development)
Day / Night switching by DTMF code or automatically according to
internal RTC clock (C)
call prolongation by dialling * or # character
two independent locks for door opening can be connected (C)
8 modes of switches (e.g. add-on bell, progressive opening)
two codes for hanging up the doorphone from the telephone
two codes for opening the door from the telephone for 1 pulse and two
codes for 2 pulses
3 x 6 codes for each relay (password entered via pushbuttons at the
door entrance)
selectable number of rings before the incomming call is answered
adjustable parameters of tone dialling, lenght of Flash and Pause
adjustable parameters of acoustic signalling
adjustable parameters of tones detector
electronic adjusting of loudness without necessity to open the front
cover of the doorphone
integrated analog colour camera with pernament or automatic
operation /C
automatic illumination of camera with infra LED /C
possible pernament powering from an external 12V power supply
(replaces the old solution of BestBox add-on unit) /C (C)
easy setting of HW with the DIP switch
factory default settings pre-set at several levels
programming either remotely via DTMF dialling or via a direct
connection to the PC
integrated heating of the PCB circuit board
pernament illumination of name plates
ground output for better protection against static electricity
(C) –full version only (Comfort)
/C - camera version only

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1.2 Terminology
telephone line analog (2 wire) is a way of connection to the public
telephone network (PSTN line) or connection to the private
brach exchange telephone switch - PABX at the place of
installation (extension line)
line picking up beginning of the telephone connection (call), similar to OFF
HOOK when the telephone handset is off the cradle
line hanging up end of call, similar to ON HOOK when the telephone
handset in on the cradle
dial/dialling DTMF - tone, it is dialling by a combination of two tones
(dialling also special characters * and #, it uses Flash loop
interruption)
Pulse –dialling by line interruption (dials digits only)
incomming call connection between A-Bell and telephone has been
established by dialling on the telephone. A-Bell answers the
call after a set number of rings. After it picks up the line and
entering a password, you can program A-Bell from your
telephone
outgoing call connection between A-Bell and the telephone has been
established by dialling of the A-Bell doorphone, e.g. after
pressing a pushbutton
call establishing status when the called party answers the call after the
number has been dialled. This status is not signalled on the
analog line, only the ringing tone ends and the call is
established. It is difficult to identify this moment exactly
code lock function for closing the relay by entering a combination of
the first 10 pushbuttons or buttons of the keypad (after
pressing the symbol of key)
external code combination entered with the first 10 pushbuttons or
buttons of the keypad (after pressing the symbol of key) for
relay switching. External code = it is entered on the A-Bell
doorphone –outside the building
internal code combination entered on the phone for relay switching
(DTMF). Internal code = it is entered inside the building
Bell new solution of analog doorphones with expanded offer of
available parameters
BellSet PC setup program for easy parameters´ settings of the new
doorphones belonging to the Bell group

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A-Bell is a member of new analog doorphones group. This
modern solution offers a comprehensive and wide range of
features meeting demands even of the most exacting customers.
1.3 Version of A-Bell doorphone and differences
A-Bell doorphone is framed as an open project for its final use inside a
specific mechanical design (housing). Features and parameters which can be
set are designed for the maximum version and individual versions differ by
exploiting the features of the maximim version. Therefore it is necessary to
define basic parameters which are the same for all versions and add-on
parameters for individual mechanical design lines (for different housings).
In this manual you will find various features marked with marking
letters. The features marked as (C) are valid for the full version of A-Bell
(Comfort) and features marked as (M) are availalble in the Maximum version
only (not available for A-Bell doorphone).
Marking of available features:
version LC (LowCost –price reduced) has got all features available except for
those which are especially marked with marking letters, see below.
version /C is version equipped with a colour analogue camera
version C(Comfort full) has got marking (C)
version M(maximum) has got marking (M) –in the mechanical housing of A-
Bell it is not produced and it is mentioned in the manual only at programming
parameters which are common for all analog doorphone versions.

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1.4 Models of A-Bell doorphone
LC and C versions of A-Bell doorphone contain the basic board which is
equipped according to its type with all connection and construction elements.
A-Bell- 01C A-Bell- 01C/C A-Bell- 02C A-Bell- 02C/C
A-Bell- 01LC A-Bell- 02LC
Expansion module Bell-8
The basic module of doorphone can contain
one or two pushbuttons. In the future it can
be expanded by up to 12 modules of Bell-8.
That means 12x8=96 pushbuttons. The
maximum number of pushbuttons of the A-
Bell doorphone can then be 97 / 98.

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Models LC and Cdiffer according to the compotents set on the board. In the
version (LC) there are missing:
second relay
camera option
RTC internal clock for automatic Day-Night switching
possibility of external power supply (it can be used for relay modes 7
and 8)
possibility to switch off the illumination of name plates (visit cards)
Models with a camera /C are equipped in addition with:
automatic / pernament illumination for the camera (infra)
disconnectable internal impedance for the camera cable end 75ohm
indication of the status with red LED diode

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1.5 PCB schematics
All functional and connection elements are marked with a number on
the figure below and explanation can be found on the next page.
Fig. 1 The main PCB board of the A-Bell doorphone
(2) + (9) + (12) only in version (C)
(3) + (4) + (5) + (16) only in version /C

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1. Connector for PC connection via USB cable (the same cable as for the
NUDV doorphone)
2. Back up battery and RTC circuit in version (C)
3. Analogue colour camera –only in version with a camera /C
4. Illumination of camera - infra LEDs illuminating the area in front of the
camera. They are active only when the camera is in operation. It is possible
to turn off the infra LEDs (see point 7) - only in version with a camera /C
5. LED indication of doorphone status (red) - only in version with a camera /C
6. Connection of loudspeaker
7. Connection of microphone (attention to polarity)
8. DIP switch in all versions:
1 = Service, usage –if you forget password
then incomming call goes to the
programming mode directly. Here you
can set a new password.
2 = Heating –it switches on an integrated heating of the board in order to
eliminate condensation of water during temperature changes
9. DIP switch in full version (C) and in version with a camera /C:
3 = external power supply
4 = external power supply –3 a 4 are always switched together at the same time.
Power supply is supplied from screw 12V (13) and there are two reasons to
use external power supply:
- use of switch mode 7 or 8 –pernament closing/opening of the switch
can be done with an external power supply only. Do not forget to set
parameter 64, too.
- connection of the doorphone to the line of PBX, which has got troubles
with consumption of current on its extension lines during the start
(Siemens). This mode fully replaces usage of an external box solving
this issue (BestBox).
5 = Camera illumination (switches on / off illumination of area in front of the
camera by using infra LED)
6 = Illumination of name plates (switches on / off LED illumination of name plates
next to the pushbutton)
7 = Switches on pernament operation of camera, in default the camera is active
only during active operation of the doorphone
8 = Enables connection of 75ohm load on the camera output - impedance
10. Input for connection of an exit button or a code reader e.g. RFID or Dallas
11. Relay 1, galvanically isolated, max. load is 48V, max. 1,5A
12. Relay 2, galvanically isolated, max load is 48V, max. 1,5A –only in version
(C)
13. 12V power supply: - relay control
- motherboard heating
- backlight illumination of nameplates
- camera powering and infra LED lighting up
- external powering of the unit (DIP 3 and 4)
The power supply can be either DC or AC, it does not depend on polarity,
from 12V max consumption is 250mA.

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The power supply can be also used for powering of the electrical lock. In
this case we recommend a power supply 12V/1A.
You can also use 24VDC power supply. You can make use of it during
installation especially at places where there is already a power supply
which is used for e.g. time attendance, access control or sliding gate. The
mainboard heating has got a regulation element for power restriction,
other circuits are designed for 24VDC. You must not use an AC power
supply, only DC power supply is allowed. It does not depend on polarity.
14. Grounding –connection to the groung for protection against static
electricity –it protects doorphone´s electronics and the telephone system.
15. Analog telephone line (it does not depend on polarity)
16. Camera output - PAL video 1V / 75ohm, for distances over 25m we
recommend using a coax cable, you can also use a UTP cable –for camera
versions only /C
17. Connector for connecting the expansion pushbutton module Bell-8
Fig. 2 Connection of pushbuttons on the main PCB board
18. Connection of pushbuttons to the basic module
19. Connection of backlight illumination for
nameplates to the basic module
20. Microphone

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2 Installation
2.1 Assembly of A-Bell doorphone
2.1.1 Dismounting of the front
cover of A-Bell
2.1.2 Wall mounting of A-Bell
Mounting is
done with wall
plugs and
screws.
We suggest
wall plugs with
5mm in
diameter, the
screw with
half-round
head,
diameter
4mm, length
35mm

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2.1.3 Replacement of name plates
Each pushbutton has got its own label held with the white plastic cup (see the
figure above). Demounting and inserting of the cap can be done with two
fingers along the longer side of the cap by a soft pull / push.
2.1.4 Demounting and mounting of pushbutton in the front
panel

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2.1.5 Closing the front cover of A-Bell
2.2 Interconnection of two modules

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2.3 Connection
For the basic functionality of the doorphone (i.e. voice
communication) you need to connect the telephone line only - LINE (8) on
Fig. 1 The main PCB board of the A-Bell. The line is connected by 2 wires
(a,b) and in stand-by it has got usually a voltage of 24V - 60V, short circuit
current 20mA - 60mA. When the line is OFF HOOK, the line voltage is 7V -
10V.
Line connection of A-Bell is announced by a sound signal (Reset) ♫
when it is disconnected from the line for a certain time. A-Bell is an analog
doorphone designed for connection to an analog line (PSTN line or PBX analog
extension). It means a line to which a standard analog telephone can be
connected. It works regardless to line polarity and in the range specified in the
technical parametres (chapter 6).
Paralel connection –we do not recommend! A paralel connection with
other analog phone or other doorphone is not recommended! We also do not
recommend using special devices switching the line (inteligent couplers/phone
sockets, adapters, etc.).
When you use A-Bell with a camera /C then you need to connect the
cable for video transmission on the screw CAM (16), see Fig. 1. For distances
of up to 25m you can use one free pair of a UTP cable. For longer distances
you need to use a coax cable, see Fig. 1. The camera mode is setup by a DIP
switch and the camera is either activated automatically (when the doorphone is
active) or is permanently ON (DIP 7). The camera illumination provided by infra
LED is either active when the camera is on (DIP 5) or you can switch it OFF
pernamently. DIP 8 enables paralel connection of 75ohm impedance load to
the video output.
12V power supply (13) on Fig. 1 must be connected to provide mother
board heating, nameplates backlighting, camera powering inluding infra LEDs
and relays control. The power supply might be either AC or DC, it does not
depend on polarity. From 12V the max consumption can be 250mA. The power
supply might be also used for electrical lock powering. In such case we
recommend to use a power supply 12V/1A. You can also use 24VDC power
supply. It is useful especially at installations where there is a power supply
installed already and it is used for sliding gate, time attendance system, etc.
Relays (10) on Fig. 1 have many possibilities of practical use. The
examples (drawings) can be found on Fig. 3. 12V power supply must be
connected for correct operation. The doorphone unit has got all important parts
galvanically isolated. The telephone line is isolated from the power supply. The
relays´contacts are also galvanically isolated from other doorphone electronic
parts.
It is absolutely forbidden to connect the doorphone to the mains
power supply of 120V or 230V!!! When you need to control devices

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connected to the mains power supply, please use contactors (power relays) as
shown on Fig. 3 example (6).

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Relays connection examples are mentioned on the following page.
There are not all of them but it can give you an idea how individual circuits
should be connected (red rings with numbers = example numbers).
1. Basic connection - 2 electrical locks and possibility to control two doors
independently. (relay mode 1 and 2 m=1) or progressive door opening
(relay mode 2 m=5 - version (C) only.
2. Two power supplies –possibility to use two power supplies independently.
One power supply for A-Bell and the second one for electrical locks. The
second electrical lock is connected inversaly (fire emergency exit).
3. Combination of doors with electrical lock and sliding gate at fencing.
4. Extending the previous example (3) to two doors with progressive opening
(this feature is setup in the TimeRelay unit, which is an optional add-on
module)
5. Combination of electrical lock and additional ring. Relay of additional ring
might be in mode m=4 (from each button it is activated for preprogrammed
time) or in mode m=6 (it is activated from one preset button for
preprogrammed time)
6. Lighting activation m=3 (for example: a path to the building) and control of
for example: heating up DAY/NIGHT mode m=8 ( (C) version only - RTC
circuit). External power supply required (DIP 3 and 4) /C version only.
Further it is neccessary to use contactor (A-Bell must not activate 230V!).

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Fig. 3 Examples of relay connection