Videx 2270/4G User manual

VX2200 4G GSM MODULE
GSM Interface Module for the VX2200 Digital System
66251245-4G-EN
V1.1 - 27/06/22
We recommend
This equipment is installed by a
Competent Electrician, Security or
Communications Engineer.
Technical Manual
ENG
ART. 2270/4G

66251245-4G-EN - V1.1 - 27/06/22
THE POWER TO SECURE
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GSM Interface Module for the VX2200 Digital System
EU RoHS DECLARATION OF CONFORMITY
4G version
SIMCom certies that the LTE/HSPA/GSM/GNSS module (model no. SIM7600G-H, SIM7600G-H miniPCIE) is in conformity with
the essential requirements of RE Directive 2014/53/EU of the European Parliament and the Council of 16th April 2014 on the
harmonization of the laws of the Member States relating to the making available on the market of radio equipment and repealing
Directive 1999/5/EC.
RE Directive 2014/53/EU :
Applied / Complied Harmonized Standards Complied
Article 3(1)(a)
Safety EN 62368-1:2014 + A11:2017 Y
Article 3(1)(a)
Health EN 62311:2008 Y
Article 3(1)(b)
EMC
EN 301 489-1 V2.2.3
EN 301 489-19 V2.1.1, EN 301 489-52 V1.1.0
EN 55032:2015, EN55035:2017
Y
Article 3(2)
Radio
EN 301 511 V12.5.1, EN 303 413 V1.1.1
EN 301 908-1 V11.1.1, EN 301 908-2 V11.1.2
EN 301 908-1 V11.1.2*, EN 301 908-13 V11.1.2
Y
*Note: This is a non-harmonized radio standard accepted by the RED (Radio Equipment Directive)
WARNING!
To comply with FCC RF exposure requirements, a separation distance of 20cm (7.87”) or more
must be maintained between the antenna of this product and all persons.
Separate FCC approval for this product is not required as it will be classed as a xed installation.
THIS PRODUCT IS NOT DESIGNED TO BE USED AS AN EMERGENCY CALL POINT.
MANUFACTURER
All Countries:
VIDEX ELECTRONICS S.P.A.
www.videx.it - [email protected]
Tel: [phone] - Fax: [phone]
Theproduct isCE markeddemonstratingits conformity and isfor distribution
within all member states of the EU with no restrictions. This product follows
the provisions of the European Directives 2014/30/EU (EMC); 2014/35/EU
(LVD); 2011/65/EU (RoHS): CE marking 93/68/EEC.
UK Customers:
VIDEX SECURITY LTD.
www.videxuk.com - [email protected]
Tech Line: 0191 224 3174 - Fax: [phone]
CUSTOMER SUPPORT
VIDEX ELECTRONICS S.P.A.
Via del Lavoro, 1 - 63846 Monte Gilberto (FM) Italy
Tel: [phone] - Fax: [phone]
www.videx.it - inf[email protected]
DECLARATION OF RESPONSIBILITY
This technical manual has been written and revised carefully. The guidance and the descriptions which are included in it are in
reference to VIDEX parts and are correct at the time of print. However, subsequent VIDEX parts and technical manuals, can be
subject to changes without prior notice. VIDEX Electronics S.P.A. and VIDEX Security Ltd. (UK) cannot be held responsible for
damages caused directly or indirectly by errors, omissions or discrepancies between the VIDEX parts and the technical manual.
VX2200 GSM Interface Module - Technical Manual
Declaration of Conformity
The product is UKCA marked demonstrating its conformity and is for
distributionwithintheUK.Thisproductfollowsthe provisionsofthefollowing
UK legislation: Electromagnetic Compatibility Regulations 2016; Electrical
Equipment (Safety) Regulations 2016; Radio Equipment Regulations 2017
and The Restriction of the Use of Certain Hazardous Substances in Electrical
and Electronic Equipment Regulations 2012 (RoHS).

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Contents
Introduction.......................................................................................................................................................................................4
System Components..........................................................................................................................................................................7
Technical Information .................................................................................................................................................................... 10
Wiring Diagrams............................................................................................................................................................................. 12
Auxiliary Inputs & Relay Outputs.................................................................................................................................................. 17
USB & RS485 Connection to a PC................................................................................................................................................... 21
Connection to a Reader, Keypad or Relay..................................................................................................................................... 22
General Directions for Installation................................................................................................................................................ 24
Fitting the SIM & Connecting Power ............................................................................................................................................. 27
Reset Procedure.............................................................................................................................................................................. 28
Programming the GSM Module..................................................................................................................................................... 29
The GSM Mobile Apps .................................................................................................................................................................... 56
System Operation........................................................................................................................................................................... 57
User Commands.............................................................................................................................................................................. 58
Additional User Information.......................................................................................................................................................... 59
User Management .......................................................................................................................................................................... 61
Troubleshooting............................................................................................................................................................................. 62
General Information....................................................................................................................................................................... 65
Notes................................................................................................................................................................................................ 66

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GSM Interface Module for the VX2200 Digital System
Introduction
MANUAL INTRODUCTION
The information in this manual is intended as an installation and commissioning guide for the Art.2270/4G GSM interface module
for the VX2200 digital system. This manual should be read carefully before the installation commences. Any damage caused to the
equipment due to faulty installation where the information in this manual has not been followed is not the responsibility of Videx
Security Ltd.
It is recommended that the Art.2270/4G GSM module and any other Videx equipment is installed by a competent electrician,
security or communications engineer.
For UK customers Videx run free training courses for engineers who are unfamiliar or who have not installed this system before.
Technical help is also available for UK customers on tel: [phone] during oce hours (8:30am - 5:00pm MON to FRI) or via e-mail:
[email protected] and for all overseas customers on tel: [phone] or via email: [email protected].
A copy of this Technical Manual can also be downloaded from the Videx websites: For UK customers www.videxuk.com and for
overseas customers www.videx.it.
SYSTEM INTRODUCTION
The Art.2270/4G GSM module is designed to work on the same technology as mobile phones, specically a 4G network, however it
is compatible with both 2G and 3G networks. As the 4G GSM is a global module it can be used around the world. It is also designed to
interface with the VX2200 digital 2 wire bus system. It enables a call to be made from a entry point (door, gate etc.) to any telephone
number (mobile or land line).
It connects directly to the 2 wire bus (L and - databus) and is compatible with the full range of VX2200 intercom panels both functional
and digital, because of this exibility it can be integrated into small or large VX2200 digital systems that also comprises of Videx
audiophones (e.g. Art.3171 etc.) and videophones (e.g. Art.6276 etc.).
It is possible to program up to 180 users where programming is carried out using phones ID’s with each programmed phone ID able
to call four telephone numbers (if the rst is busy or not answered, the call can be diverted to up to three dierent numbers). Features
of the system include:
• Program up to 180 users (phone ID’s 1 to 180) each with 4 programmable telephone numbers (1 primary and 3 divert numbers,
land line or mobile numbers).
• Programmed numbers can be used in conjunction with Videx’s VX2200 audiophones and/or videophone range.
• 3 dry contact relay outputs (R1, R2 and R3) and 3 switched 0V auxiliary inputs (A1, A2 and A3).
• 3 programmable automated SMS messages triggered by the auxiliary inputs (A1, A2 and A3).
• Apartment alarm signal on the Land -databus which can activate the relays and/or send an SMS message to the master number.
• Dial to open (DTO) facility for each relay output (R1, R2 and R3), including up to 32 temporary DTO numbers for relay R1 only.
This feature enables up to 1000 DTO numbers (000 - 999) for relay R1 and 500 DTO numbers each (000 - 499) for relays R2 and
R3 respectively, to dial into the GSM module, the module will not answer these calls, but will activate the corresponding relay
without being charged for the call.
• Programmable phone ID timeband facility (a single timeband only).
• Programmable access control timeband facility (up to 10 timebands).
• Programmable free access timeband facility (up to 10 timebands) for relay outputs R1, R2 and R3.
• Up to 10 programmable access levels (for relay R1 DTO numbers, proximity and coded access facility (when connected to
Art.4850R proximity readers and/or Art.4903 keypads via RS485).
• Automatic time correction features and daylight saving time adjustment.
• Micro USB connection for ease of programming using the GSMSK PC software (version 4.1.0.36 or later).
• RS485 bus for connecting additional Art.4903 keypads and/or Art.4850R proximity readers (up to a maximum of 8 devices),
also for connecting Art.2813 RS485 remote relays (up to a maximum of 64 remote relay units). The RS485 bus can also be
used for ease of programming using the GSMSK PC software.
• When connected via RS485 to the Art.4903 keypad allows up to 400 permanent access codes and 32 temporary access codes
to be programmed with access control timeband and access level features.
• When connected via RS485 to the Art.4850R proximity reader allows up to 2000 fobs/cards to be programmed with access
control timeband and access level features.
• Includes a facility to remotely program the GSM module ‘over the air’ using the GSMSK PC software without the need to
actually connect a PC or laptop directly to the intercom via the USB or RS485 connections.
• Event logging system that can record up to 8000 events which can be downloaded via the GSMSK PC software.
• Remote event logging facility (unlimited events) which can be monitored in real time (refer to notes user management on
page 61).
• Integrated bootloader function for updating GSM module’s rmware via the GSMSK PC software.

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Programming of the telephone numbers (primary, diverts and DTO’s) and additional features including fobs/cards for any additional
proximity readers, programming access codes for additional coded keypads, timebands, access levels etc. can be carried out via text
messaging (refer to notes programming the GSM module on pages 29 - 55) or using the GSMSK PC software (refer to the manual
GSMSK_66251720-EN_V2-2 or later) by direct USB or RS485 connection to a PC or remotely via the ‘over the air’ feature (the PC
software can still be used to program the GSM intercom, but the PC is not directly connected to it via the USB or RS485 connection,
further details can be found on pages 46 - 47).
Alternatively a limited number of programming features can be carried out using the Videx SMS Wizard (for users) or for more in
depth programming using the Videx SMS Wizard PRO (for installers), refer to notes the GSM mobile Apps on page 56.
SIM CARD SELECTION
IMPORTANT: A SIM IS REQUIRED FOR THIS PRODUCT BUT NOT SUPPLIED BY VIDEX.
THE ART.2270/4G GSM MODULE CAN ONLY ACCEPT A NANO SIZE SIM CARD, BOTH A
STANDARD SIZE SIM AND MICRO SIM ARE NOT SUITABLE.
It is recommended to choose the SIM card which has the best coverage for the area in which the intercom panel will be installed.
Both contract and ‘Pay as you go’ SIM cards can be used, however if using a ‘Pay as you go’ we would recommend setting up an
automatic top up to avoid running short on credit and losing the use of the intercom panel. Alternatively if you already have a
contract mobile phone it should be possible to get a second SIM card and telephone number on the existing account. For more
information regarding this contact the SIM card provider or visit their website, as this is a service NOT provided by VIDEX.
NETWORK PROVIDER SELECTION
It is imperative that for the reliable operation of the system that the best network provider for the area is selected. Problems such as
network disconnection can occur if the provider has signal or interference problems for that area.We would recommend using a GSM
signal strength meter to survey the intended antenna location. Contact Videx for more information on where to purchase a tester.
For UK customers, as an initial check we also recommend visiting the ofcom website www.ofcom.org.uk and follow the onsite links to
their online mobile coverage tool (ofcom mobile and broadband checker app). This tool will advise on the best coverage for the main
network providers and other general queries that you may have about the service provider. For all overseas customers we suggest
consulting the website of the network provider that will be used to check the coverage in your area.
The antenna should always be mounted vertically at the highest point possible. Metal structures and sources of interference such as
power cables, control panels etc. can aect signals and so the antenna should be mounted away from these.
When registering a new SIM you may be asked for the IMEI number. This is the unique 15 digit serial number of the 4G GSM module.
This number is located internally on the main hardware chip inside the GSM module. To obtain the IMEI number from the GSM
module refer to the programming notes obtain the GSM’s IMEI number on page 45 - 46.
PRECAUTIONARY ADVICE
• When mounting the GSM antenna, choose a location which is away from human interaction and away from the intercom panel.
Route the GSM antenna cable from the intercom panel so that it is separate from the power supply cables and microphone wire.
• Always ensure the power is switched OFF to the intercom panel before inserting or removing the SIM card.
• New SIM cards will need registering with the network service provider before they can be used. Full details of how this is done
can normally be found in the SIM card pack. It will normally require that the SIM card is inserted into a mobile phone, a number
dialled and instructions followed. While the SIM is in the mobile phone it would be a good time to disable any PIN codes, call
diverts, ring back and disable features such as voicemail and text alerts. Details of how to do this can be found on the SIM card
provider’s website or by calling their customer services. Recommended SIM card providers are: Vodafone, Three, O2or EE.
• To be able to receive text messages from the intercom panel, the SIM card will require an SMS service centre number. This is
normally pre-installed on new SIM cards but if you are having trouble receiving SMS messages you will need to conrm this by
inserting the SIM card into a mobile phone and using the phones menu options to check it. If a number is not programmed then
it should be programmed while in the phone (the number can be obtained from the network service provider).
• Voicemail and text alerts must be switched OFF on the SIM card when using the dial in to release the door/gate feature. For
Vodafone and O2this can be done while the SIM card is in the intercom panel. For other network providers the SIM card must
be removed from the intercom panel, inserted into a mobile phone and the mobile phone menu instructions followed. This
procedure may vary between network providers of dierent countries, therefore we suggest contacting your provider for more
information regarding this.
• When storing the GSM intercom panel’s telephone number in your own mobile phone avoid using an obvious name such as
‘Front Door’, or ‘My Gate’ as this would make it easy to decipher if your phone was lost or stolen.
• The PIN request feature must be disabled on the SIM card before using it in the GSM intercom panel. It is likely on a new SIM
card that it will not be enabled but if it is, it will prevent the system from working at all.
Introduction

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Introduction
• This product may not be suitable for installation in hospitals, health care facilities or in the presence of ammable gases or
liquids. Seek advice and authorisation before installing this product in these locations. This product is not designed to be used
as an emergency call point.
IMPORTANT: ALL NETWORK PROVIDER AND SERVICES CONFIGURATION CODES MENTIONED INTHIS MANUAL ARE
SPECIFIC FOR THE UK ONLY. FOR OVERSEAS CUSTOMERS PLEASE CONTACT THE NETWORK PROVIDER OF YOUR
COUNTRY FOR THE CORRESPONDING CODES, HOWEVER VIDEX OFFERS NO GUARANTEE THAT ANY ADDITIONAL
CODES WILL WORK.
IMPORTANT NOTE ABOUT THE SIM
When selecting the SIM with the chosen network provider it is recommended that it is setup with a suitable call allowance and text
messages (most UK network providers oer unlimited calls and texts) and also a sucient data plan. You will need to contact the
network provider directly or visit their website to set this up.
IMPORTANT NOTE: THE SERVICES MENTIONED ABOVE ARE NOT PROVIDED BYVIDEX ELECTRONICS S.P.A. OR VIDEX
SECURITY LTD.

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DESCRIPTION
For the Art.2270/4G GSM module to work the system requires any intercom panel from the VX2200 range (see table below), a 12Vdc
power supply (HDR-15-12, 12Vdc 1.25A), nano SIM card (refer to notes on Sim Card Selection on pages 5 - 6) and an Art.434 GSM antenna.
Like other devices for the digital VX2200 2 wire bus system the Art.2270/4G GSM module connects to the 2 wire databus Land -.
Programming of the module can be carried out by sending text (SMS) messages or by using the GSMSK PC software (version 4.1.0.36 or
later), also refer to the programming manual GSMSK_66251720-EN_V2-2 (or later).
COMPATIBLE VX2200 INTERCOM PANELS
The following table shows the range of VX2200 intercom panels that can be used with the Art.2270/4G GSM module:
Functional Panel Type Description
Art.4203-n, Art.4204-n,
Art.4204X-n
(audio)
4000 series modular range audio panels, where n = 0, 1, 2, 1D or 2D buttons. When using the audio
panel the appropriate 4000 series button module(s) may be required (Art.4842..Art.4845, Art.4842D..
Art.4845D, Art.4042..Art.4045 and Art.4042D..Art.4045D) depending on the size of the system.
Art.4283-n, Art.4284-n,
Art.4284X-n
(audio & video)
4000 series modular range video panel, where n = 0, 1, 2, or 1D buttons. When using the video panel
the appropriate 4000 series button module(s) may be required (Art.4842..Art.4845, Art.4842D..
Art.4845D, Art.4042..Art.4045 and Art.4042D..Art.4045D) depending on the size of the system.
Art.8203-n
(audio)
8000 series modular range audio panel, where n = 0, 1or 2buttons. When using the audio panel
the appropriate 8000 series button module(s) may be required (Art.8842..Art.8845 and Art.8842D..
Art.8845D) depending on the size of the system.
Art.VR4KAM2W-n
(audio)
Vandal Resistant 4000 series modular range audio panel, where n = 0, 1, 2, 3or 1NP buttons. When
using the audio panel the appropriate VR4K series button module(s) may be required (Art.VR4KBM-4..
Art.VR4KBM-9, Art.VR4KBM-2NP..Art.VR4KBM-4NP) depending on the size of the system.
VR120/138-n
(audio)
Vandal Resistant VR120 series audio panel, where n = the number of call buttons required (up to 24).
VR120/138-n/CL
(audio + codelock)
Vandal Resistant VR120 series audio panel with codelock facility, where n = the number of call buttons
required (up to 24).
VR120/138-n/PR
(audio + proximity)
Vandal Resistant VR120 series audio panel with proximity reader, where n = the number of call buttons
required (up to 24).
VR120/138-n/V
(audio & video)
Vandal Resistant VR120 series video panel, where n = the number of call buttons required (up to 24).
VR120/138-n/V/CL
(audio & video + codelock)
Vandal Resistant VR120 series video panel with codelock facility, where n = the number of call buttons
required (up to 24).
VR120/138-n/V/PR
(audio & video + proximity)
Vandal Resistant VR120 series video panel with proximity reader, where n = the number of call buttons
required (up to 24).
VR130/2W-n,
VR130/2W-n/NP
(audio & video)
Vandal ResistantVR130 series video panel (including nameplate window versions), where n = the number
of call buttons required (up to 24).
VR130/2W-n/CL,
(audio & video + codelock)
Vandal Resistant VR130 series video panel with codelock facility, where n = the number of call buttons
required (up to 24).
VR130/2W-n,
(audio & video + proximity)
Vandal Resistant VR130 series video panel with proximity reader, where n = the number of call buttons
required (up to 24).
Digital Panel Type Description
Art.4202 series
(audio)
4000 series modular range, digital audio panel (with A-F alpha-numeric keypad, Art.4202 or name scroll
facility, Art.4202/R).
Art.4202V series
(audio & video)
4000 series modular range, digital video panel (with A-F alpha-numeric keypad, Art.4202V or name
scroll facility, Art.4202/RV or name scroll facility).
Art.8202 series
(audio)
8000 series modular range, digital audio panel (with A-H alpha-numeric keypad, Art.8202 or name
scroll facility, Art.8202R).
SP300-1 series
(audio)
Vandal Resistant 2200 digital audio panel and bezel box.
SP301-1C series
(audio & video)
Vandal Resistant 2200 digital video panel with colour camera and bezel box.
System Components

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Art.4212 series
(audio)
Vandal Resistant 4000 series modular range, digital audio panel (with A-F alpha-numeric keypad,
Art.4212 or name scroll facility, Art.4212R and proximty). Including Art.4212/UK and Art.4212R/UK.
Art.4212V series
(audio & video)
Vandal Resistant 4000 series modular range, digital video panel (with A-F alpha-numeric keypad,
Art.4212V or name scroll facility, Art.4212RV and proximty). Including Art.4212V/UK and
Art.4212RV/UK.
IMPORTANT NOTE: Intercom panel setup and conguration for the compatible panel types listed in the table above and shown
on page 6 can be found in either the VX2200 technical manual: VX2K2HDIGSYS Version 1.1 (or later) or the relevant installation
instructions that accompany the respective intercom panel.
ART. 434 GSM ANTENNA & ART. 434 BLOCK ANTENNA
The Art.434 GSM antenna, Fig.1, connects to the SMA female bulkhead connection on the rear of the 4G GSM module, see Fig.1 inset. A
GSM antenna with an SMA male connector should be used. Also available to use with the 4G GSM series modules is the Art.434 block
antenna, Fig.1 inset.
Art.434 antenna
A
C C DB
H I J
F
G
G
E
Use the right angled
SMA female antenna
connection located
on the side of the
Art.2270/4G GSM
module (above
terminal A3)
24.7
49.5
117
107.5
38
Art.434
block antenna
Fig. 1
ANTENNA PARTS
“B” type GSM antenna. Antenna mounting clamp for L bracket.
Right angled SMA adapter. Fixing support holes for “B” type antenna.
Self-threading screw (Ø2.9x6.5mm) for “B” type antenna. Expansion type wall plugs (Ø6mm).
SMA male antenna connector. Aluminium L bracket for wall mounting.
3m antenna cable. Self-threading screw (Ø4x30mm).
System Components

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System Components
IMPORTANT NOTE: AN ANTENNA MUST ALWAYS BE FITTED FOR THE GSM MODULE TOWORK. ALWAYS ROUTETHE GSM
ANTENNA CABLE AWAY FROM THE MICROPHONE WIRES AND THE POWER SUPPLY WIRES TO AVOID INTERFERENCE ON
THE SPEECH CHANNELS.
IN INSTANCES WHERE THERE IS A TIGHT FITTING SPACE FOR THE SMA MALE CONNECTOR ONTHE ANTENNA CABLE, THE
RIGHT ANGLED SMA ADAPTER, FIG.5 , CAN BE USED TO HELP REROUTE THE CABLE DOWN THE BACK SIDE OF THE
GSM MODULE.
ANTENNA CHARACTERISTICS Art. 434 GSM ANTENNA Art. 434 BLOCK ANTENNA
RF & ELECTRICAL SPECIFICATION
Network coverage: 2G, 3G and 4G networks
Working frequency: GSM (900MHz), DCS (1800MHz) AMPS (824-894MHz), GSM (900MHz),
DCS (1800MHz), PCS(1900MHz),
3G (2100MHz), WiFi (2400MHz),
4G/LTE (791-862/2500-2690MHz)
Gain: 3 ± 0.5dBi (avg.) 2 dBi (max.)
Voltage Standing Wave Ratio
(V.S.W.R.)
< 2.0 < 2.5:1
Polarization: Linear
Impedance: 50 Ohms
DATA, MATERIALS & DIMENSIONS
Cable: RG174 coax cable
Cable length: 3m
Connector: SMA male
Materials: Antenna hat: ABS
Antenna body: ABS and PVC
Antenna Lid: ABS
Antenna Base: metal
Colour: Black
Mounting: external use, surface mount internal or external use, surface mount
Dimensions (mm): 120 (H) x 30 (base diameter) 38 (H) x 117 (L) x 49.5 (W)
12VDC 2A POWER SUPPLY HDR1512
The 4G GSM intercom is designed to work with power supplies
in the range of 12Vdc and should be capable of supplying a
constant current of no less than 1A.
The Art.HDR15-12, Fig.2, is a DIN rail mount slim line power
supply that is supplied with the 4G GSM series audiokits.
It has a mains voltage input of 230-240Vac, 50/60Hz and an
adjustable 12Vdc output.
TERMINALS & ADJUSTMENT POTS
LMains input 230-240Vac, 50/60Hz (live)
NMains input 230-240Vac, 50/60Hz (neutral)
+V +12Vdc output
-V 0V (ground) output
Vo Adj. Voltage adjustment POT (10.8V - 13.8Vdc range)
93
17.5 54.5
Fig. 2
SPECIFICATION ELECTRICAL DATA
Housing: 1.5 modules A Type DIN box Mains voltage: 230-240Vac, 50/60Hz
Mounting: DIN rail only Output voltage: 12Vdc
Dimensions (mm): 17.5 (W) x 93 (L) x 54.5 (H) Adjustable voltage range: 10.8Vdc - 13.8Vdc (max.)
Working temperature: -10° to +50°C Current rating: 1.25A
Power rating: 15W

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Technical Information
ART. 2270/4G GSM INTERFACE MODULE
VERMD X.X.X
Art. 2270/4G GSM
Interface Module
Antenna connection
side view
157.5mm
85mm
65mm
Fig. 3
LEGEND
Current rmware version (VERDM X.X.X)Land -databus terminals
Status indication LED's RS485 bus terminals
Micro USB connection Auxiliary input terminals A1, A2 and A3
VR1 and VR2 speech volume control POTs 12Vdc power input terminals
SIM card holder (for 12.3mm x 8.8mm nano SIM) Power & network (2G, 3G or 4G) status indication LED
SMA Antenna connection Relay outputs (NO/CO/NC) for relays R1, R2 and R3
MODULE VOLUME ADJUSTMENT POTS VR1 & VR2
There are 2 volume adjustment POT’s located on the top right side of the Art.2270/4G GSM module, Fig.3, . The VR1 POT controls
the speech volume towards the door panel (panel’s speaker) and the VR2 POT controls the speech volume towards the telephone
line (panel’s microphone). Additionally, the volume can also be adjusted during a call electronically via the telephone keypad (refer
to user command table 1 on page nn). By default both VR1 and VR2 adjustment POTs are set approximately halfway, see Fig.4.
Speaker Volume Adjustment (speech from phone to panel) - to increase the speaker volume turn
the VR1 POT clockwise (up) and to decrease the speaker volume turn the VR1 POT anti-clockwise
(down).
Microphone Volume Adjustment (speech from panel to phone) - to increase the microphone
volume turn the VR2 POT clockwise (up) and to decrease the microphone volume turn the VR2 POT
anti-clockwise (down). VR1 VR2
DOWN UPDOWN UP
Fig. 4