Westermo GDW-11 User manual

GDW-11
GSM/GPRS
Modem
www.westermo.com
©Westermo Teleindustri AB • 2005
User Guide
6615-2200

26615-2200
Legal information
The contents of this document are provided “as is”. Except as required by applicable
law, no warranties of any kind, either express or implied, including, but not limited to,
the implied warranties of merchantability and fitness for a particular purpose, are made
in relation to the accuracy and reliability or contents of this document.Westermo
reserves the right to revise this document or withdraw it at any time without prior
notice.
Under no circumstances shall Westermo be responsible for any loss of data or income
or any special, incidental, and consequential or indirect damages howsoever caused.
More information about Westermo can be found at the following Internet address:
http://www.westermo.com

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Safety
Before using this unit:
Read this manual completely and gather all information on the unit. Make sure
that you understand it fully. Check that your application does not exceed the safe
operating specifications for this unit.
Hazardous voltages may occur within this unit when connected to a power supply.
Prevent access to hazardous voltages by disconnecting the unit from its power
supply.
Prevent damage to internal electronics from electrostatic discharges (ESD) by
discharging your body to a grounding point (e.g. use of wrist strap).
Before installation:
This unit should only be installed by qualified personnel.
This unit should be built-in to an apparatus cabinet, or similar, where access is
restricted to service personnel only.
The power supply wiring must be sufficiently fused, and if necessary it must be
possible to disconnect manually from the power supply. Ensure compliance to
national installation regulations.
This unit uses convection cooling.To avoid obstructing the airflow around the unit,
follow the spacing recommendations (see Installation section).
Care recommendations
Follow the care recommendations below to maintain full operation of unit and to fulfil
the warranty obligations.
This unit must not be operated with covers or lids removed.
Do not attempt to disassemble the unit.There are no user serviceable parts inside.
Do not drop, knock or shake the unit, rough handling beyond the specification may cause
damage to internal circuit boards.
Do not use harsh chemicals, cleaning solvents or strong detergents to clean the unit.
Do not paint the unit. Paint can clog the unit and prevent proper operation.
Do not expose the unit to any kind of liquids (rain, beverages, etc).The unit is not water-
proof. Keep the unit within the specified humidity levels.
Do not use or store the unit in dusty, dirty areas, connectors as well as other mechanical
part may be damaged.
If the unit is not working properly, contact the place of purchase, nearest Westermo
distributor office or Westermo Tech support.
GSM specific safety
Please read and follow the guidelines listed below.The precautions must be observed
during all phases of the operation. Breaking these rules may be dangerous, illegal or affect
performance of the unit and/or invalidate the unit’s approval and/or warranty.
!
!

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General
Remember to follow any special regulations and warnings in force in any area and never
use the unit whenever it’s forbidden to use it. Do not use the unit when it may cause
interference or danger.A wireless device exposed to interference above specified limits
could result in deteriorated performance.
Hospitals or other Medical environment
Do not use the unit in a medical environment such as health care facilities. Follow any
regulations or rules that instruct you to not use the unit.
Pacemakers
The Health Industry Manufacturers Association recommends that a minimum separation
of six (6”) inches be maintained between cellular wireless equipment and a pacemaker
to avoid potential interference with the pacemaker.These recommendations are consis-
tent with the independent research by and recommendations of Wireless Technology
Research.
Persons with pacemakers:
… Should ALWAYS keep the the unit and its antenna more than six inches from their
pacemaker when the unit is turned ON.
… If you have any reason to suspect that interference is taking place, turn your wireless
equipment OFF immediately.
Hearing Aids
Some digital wireless equipment may interfere with some hearing aids. In the event of
such interference, you may want to consult your service provider [or call the customer
service line to discuss alternatives.]
Other Medical Devices
If you use any other personal medical device, consult the manufacturer of your device to
determine if they are adequately shielded from external RF energy. Your physician may be
able to assist you in obtaining this information.
Turn the wireless equipment OFF in health care facilities when any regulations posted in
these areas instruct you to do so. Hospitals or health care facilities may be using equip-
ment that could be sensitive to external RF energy.
Aircraft
Do not use the unit in an aircraft.The use of a wireless unit in an aircraft may be danger-
ous to the operation of the aircraft, disrupt the wireless network, and may be illegal.
Failure to observe these instructions may lead to suspension or denial of cellular services
to the offender, legal action, or both.
Vehicle
If the unit is incorrectly installed in a vehicular environment, the operation of the unit
could interfere with the vehicle electronics. Faulty installation and/or operation can con-
stitute a safety hazard.

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For Vehicles equipped with an airbag
An air bag inflates with great force. DO NOT place objects, including either installed or
portable wireless equipment, in the area over the air bag or in the air bag deployment
area. If in-vehicle wireless equipment is improperly installed and the air bag inflates, seri-
ous injury could result.
Blasting areas
Do not use the unit where blasting is in progress or in “blasting areas”.
Observe restrictions and follow any regulation or rules.
Explosive atmospheres
Do not use the unit in any area with a potentially explosive atmosphere.
Potentially explosive areas are often, but not always, clearly marked.
They include fuelling areas such as petrol stations, below decks on boats, fuel or chemical
transfer or storage facilities, and areas where the air contains chemicals or particles, such
as grain, dust, or metal powder.
RF energy
The GDW-11 is a low power radio transmitter and receiver.When it is ON, it receives
and also sends out radio frequency (RF) signals.
Most modern electronic equipment is shielded from RF signals. However, certain elec-
tronic equipment may not be shielded against the RF signals from the wireless unit.All
radio-transmitting devices send signals, which may cause interference in different elec-
tronic devices.To avoid interference, place the units antenna a sufficiently long distance
from other electronics.
Critical applications
Cellular units operate using radio signals and cellular networks cannot be guaranteed to
connect in all conditions.Therefore you should never rely solely on a wireless device for
essential communications, for example medical emergencies.
Backup copies
Remember to make backup copies of all important data, for example PIN/PUK codes,
contents of SIM card etc.
Antenna care
Use only the supplied or an approved replacement antenna. Unauthorized antennas,
modifications, or attachments could damage the unit and may violate current regulations.
Do not touch the antenna unnecessarily when the unit is in use. Contact with the anten-
na affects call quality and may cause the unit to operate at a higher power level than oth-
erwise needed.
Maintenance
No maintenance is required, as long as the unit is used as intended within the specified
conditions.

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Agency approvals and standards compliance
Type Approval / Compliance
EMC EN 61000-6-2, Immunity industrial environments
EN 55024, Immunity IT equipment
EN 61000-6-3, Emission residential environments
FCC part 15 Class B
EN 50121-4, Railway signalling and telecommunications apparatus
IEC 62236-4, Railway signalling and telecommunications apparatus
Safety EN 60950, IT equipment
R&TTE
Article 3.1b EN 301 489-1,
EN 301 489-7
Article 3.2 EN 301 489-1,
EN 301 419-1
EN 301 511
FCC Part 15.105 Notice: This equipment has been tested and found to comply with the
limits for a Class B digital device, pursuant to Part 15 of the
FCC Rules.These limits are designed to provide reasonable pro-
tection against harmful interference in a residential installation.
This equipment generates, uses and can radiate radio frequency
energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio communica-
tions. However, there is no guarantee that interference will not
occur in a particular installation. If this equipment does cause
harmful interference to radio or television reception, which can
be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of
the following measures:
… Reorient or relocate the receiving antenna
… Increase the separation between the equipment and receiver
… Connect the equipment into an outlet on a circuit different
from that to which the receiver is connected
… Consult the dealer or an experienced radio/TV technician
for help.

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Declaration of Conformity
Westermo Teleindustri AB T05-0194
Declaration of conformity
Org.nr/
Postadress/Postal address Tel. Telefax Postgiro Bankgiro Corp. identity number Registered office
S-640 40 Stora Sundby 016-428000 016-428001 52 72 79-4 5671-5550 556361-2604 Eskilstuna
Sweden Int+46 16428000 Int+46 16428001
The manufacturer Westermo Teleindustri AB
SE-640 40 Stora Sundby, Sweden
Herewith declares that the product(s)
Type of product Model Art no Installation manual
DIN-rail GDW-11 3615-0001 6615-2200
DIN-rail GDW-12 3615-0010 6615-2210
is in conformity with the following EC directive(s).
No Short name
89/336/EEG Electromagnetic Compatibility (EMC)
73/23/EEG Low Voltage Directive - LVD
1999/5/EC RTTE Radio and Telecommunications Terminal Equipment
References of standards applied for this EC declaration of conformity.
No Title Issue
EN 301 419-1 Digital cellular telecommunications system (Phase 2); Attachment
requirements for global system for mobile communications
(GSM); Part 1: Mobile stations in the GSM 900 and DCS 1800
bands; Access
V4.1.1 (04/2000)
EN 301 511 Global system for mobile communications (GSM); Harmonized
standard for mobile stations in the GSM 900 and DCS 1800 bands
covering essential requirements under Article 3(2) of the R&TTE
Directive (1999/5/EC)
V9.0.2 (03/2003)
EN 301 489-7 Electromagnetic compatibility and radio spectrum matters (ERM);
Electromagnetic compatibility (EMC) standard for radio
equipment and services
V1.2.1 (08/2002)
EN 61000-6-2 Immunity for industrial environments 2 (2001)
EN 55024 Information technology equipment – Immunity 1 (1998)
EN 61000-6-3 Emission standard for residential, commercial and light-industrial
environments
1 (2001)
EN 60950-1 Safety of information technology equipment 1 (2001)
ThelasttwodigitsoftheyearinwhichtheCEmarkingwasaffixed: 05
Herewith declares that product(s) listed above is in conformity with
No Title Issue
FCC part 15 Radio frequency devices
Hans Levin
Technical Manager
19th October 2005

Packaging
Enclosure UL 94 PC / ABS Flammability class V-1
Dimension W x H x D 35 x 121 x 119 mm
Weight 0.2 kg
Degree of protection IEC 529 Enclosure IP 21
Cooling Convection
Mounting Horizontal on 35 mm DIN-rail
Environmental
Temperature Operating –25 to +50°C
Storage & Transport –30 to +85°C
Humidity Operating 5 to 95% relative humidity
Storage & Transport 5 to 95% relative humidity
Altitude Operating 2 000 m / 70 kPa
Service life Operating 10 year
Vibration IEC 60068-2-6 Operating 7.5 mm, 5 – 8 Hz
2 g, 8 – 500 Hz
Shock IEC 60068-2-27 Operating 15 g, 11 ms
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Electromagnetic Compatibility
Phenomena Test Description Test levels
ESD EN 61000-4-2 Enclosure contact ± 6 kV
Enclosure air ± 8 kV
RF field AM IEC 61000-4-3 Enclosure 20 V/m 80% AM (1 kHz), 80 – 2000 MHz
modulated
RF field 900 MHz ENV 50204 Enclosure 20 V/m pulse modulated 200 Hz, 900 ± 5 MHz
Fast transient EN 61000-4-4 Signal ports ± 2 kV
Power ports ± 2 kV
Surge EN 61000-4-5 Signal ports unbalanced ± 2 kV line to earth, ± 2 kV line to line
Signal ports balanced ± 2 kV line to earth, ± 1 kV line to line
Power ports ± 2 kV line to earth, ± 2 kV line to line
RF conducted EN 61000-4-6 Signal ports 10 V 80% AM (1 kHz), 0.15 – 230 MHz
Power ports 10 V 80% AM (1 kHz), 0.15 – 230 MHz
Power frequency EN 61000-4-8 Enclosure 100 A/m, 50 Hz, 16.7 Hz & 0 Hz
magnetic field
Pulse magnetic field EN 61000-4-9 Enclosure 1000 A/m, 6.4 / 16 ms 5 pos/5neg pulse
in XYZ direction
Voltage dips EN 61000-4-11 AC power ports 10 & 5 000 ms, interruption
and interruption 10 & 500 ms, 30% reduction
100 & 1 000 ms, 60% reduction
Mains freq. 50 Hz EN 61000-4-16 Signal ports 100 V 50 Hz line to earth
Mains freq. 50 Hz SS 436 15 03 Signal ports 250 V 50 Hz line to line
Voltage dips EN 61000-4-29 DC power ports 10 & 100 ms, interruption
and interruption 10 ms, 30% reduction
10 ms, 60% reduction
+20% above & –20% below rated voltage
Radiated emission EN 55022 Enclosure Class B
FCC part 15 Class B
Conducted emission EN 55022 AC power ports Class B
FCC part 15 AC power ports Class B
EN 55022 DC power ports Class B
Dielectric strength EN 60950 Signal port to other 2 kVrms 50 Hz 1 min
isolated ports
Power port to other 3 kVrms 50 Hz 1 min
isolated ports 2 kVrms 50 Hz 1 min (@ rated power <60 V)
Type tests and environmental conditions

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Description
The GDW-11 provides a reliable data communication link over GSM/GPRS networks.
The unit has been designed for use in industrial data communication applications and has
several features that are not normally present on standard GSM modems. The GDW-11
is a DIN-rail mounted modem with RS-232 interface in a 9-pin D-sub.
Features:
… Dual band GSM 900/1800 MHz
… GPRS class 10
… Integrated TCP/IP stack
… All configurations are done by industry standard AT-commands
… Serial interface RS-232 in D-sub
… DTR-dialing
… DTR-SMS
… Isolated 12 – 48 VDC power supply
… Din-rail mountable
… LED indicators
… Windows configuration tool.
The GDW-11 can be used in data communication applications together with other GSM
modems, traditional analogue PSTN modems or ISDN adapters. Packet switched data can
be transferred via the GPRS service.

10 6615-2200
Functional description
SIM
connector
transient
protection
RS-232
Drivers
and
protection
LED
driver
GSM
Engine
LED’s RF
Interface
SMA
connector
SIM card
connector
DIP
switches
9-pos
D-sub
2-pos
screw
terminal
5-pos
screw
terminal
Isolated power supply

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Rated voltage 12 to 48 VDC
Operating voltage 10 to 60 VDC
Rated current 350 mA @ 12 VDC
150 mA @ 24 VDC
75 mA @ 48 VDC
Rated frequency DC
Inrush current I2t 0.05A2s
Startup current* 0.75A peak
Polarity Reverse polarity protected
Connection Detachable screw terminal
Connector size 0.2 – 2.5 mm2(AWG 24-12)
Isolation to 3000 Vrms to all other interfaces
Power interface
Interface specifications
Electrical specification RS-232 V.24
Data rate 300 bit/s – 115.2 kbit/s
Data format 7 or 8 data bits, Odd, even or no parity, 1 or 2 stop bits
Connection 9-pin D-sub female DCE, 5 pos screw terminal
Transmission range 15 m
Isolation to 3000 Vrms to power interface
RS-232 interface
* External supply current capability for proper startup
Frequency bands GSM900 TX 880 – 915 and RX 925 – 960 MHz
GSM1800 TX 1710 – 1785 and RX 1805 – 1880 MHz
Data rate CSD: up to 14.4 kbit/s, GPRS: up to 85.6 kbit/s
Connection SMA female, impedance: 50 ohm
Isolation to 3000 Vrms to power interface
Antenna interface
Electrical specification 3 volts SIM supported
Isolation to 3000 Vrms to power interface
SIM interface

12 6615-2200
This unit uses convection cooling.To avoid obstructing
the airflow around the unit, use the following spacing
rules. Minimum spacing 25 mm (1.0 inch) above /
below and 10 mm (0.4 inches) left /right the unit.
Spacing is recommended for the use of unit in full
operating temperature range and service life.
Mounting
This unit should be mounted on 35 mm DIN-rail, which is
horizontally mounted inside an apparatus cabinet, or similar.
Snap on mounting, see figure.
Removal
Press down the black support at the top of the unit. See figure.
Installation
Mounting / Removal
Before mounting or removing the unit:
Warning! Do not open connected unit
Hazardous voltages may occur within this unit when connected to a power
supply.
Warning!
Prevent access to hazardous voltages by disconnecting the unit from its
power supply.
Warning!
Prevent damage to internal electronics from electrostatic discharges (ESD)
by discharging your body to a grounding point (e.g. use of wrist strap).
!
10 mm *
(0.4 inches) 25 mm
25 mm
* Spacing (left/right) recommended
for full operating temperature range
CLICK!

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SIM card
The SIM card is accessable under the lid on top of the unit.The SIM card is needed for
full operation of the unit.
Warning!
Prevent damage to internal electronics from electrostatic discharges (ESD)
by discharging your body to a grounding point (e.g. use of wrist strap), before
the lid on top of the unit is removed.
Warning! Do not open connected equipment.
Hazardous voltage may occur within this unit when connected to power supply.
Prevent access to hazardous voltages by disconnecting the unit from power
supply and all other electrical connections.
It is necessary to have a GSM subscription
from a network operator.
They will provide you with a SIM card that
should be mounted in the SIM card holder.
The SIM card holder is located under the top
lid of the unit.
!
!
Antenna care and placement
Warning! Please ensure that power is disconnected from the unit before
connecting the antenna.
Since the GDW-11 is installed in a fixed location, special care must be taken
when planning the installation, especially when placing the antenna.The standard
antenna shipped with the product is an efficient dual-band antenna designed for
the GSM900 and the GSM1800 bands used in the European and most Asian
countries.
Depending on the installation location and surrounding materials, the signal
strength reaching the GDW-11 may not be sufficient.The best way to find the
optimal position of the antenna is to use the Westermo GD-Tool to measure
the “received signal strength”.
The antenna must only be connected locally and not connected to a cable
distribution system going outside the building.
!

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PWR
NET
RD
TD
SIM interface under lid
Antenna interface
LED Indicators
(for details
see next page)
Power connection
screw terminal
Connections
2-position Description
No. 1 – VDC
No. 2 + VDC
RS-232 interface
screw terminal *
5-position Direction Description
No. 1 In TD
No. 2 Out RD
No. 3 In DTR
No. 4 Out DSR
No. 5 – SG
RS-232 interface
D-sub *
9-position Direction Description
No. 1 Out Data Carrier Detect (DCD)
No. 2 Out Receive Data (RD)
No. 3 In Transmit Data (TD)
No. 4 In Data Terminal Ready (DTR)
No. 5 – Signal ground (SG)
No. 6 Out Data Set Ready (DSR)
No. 7 In Request To Send (RTS)
No. 8 Out Clear To Send (CTS)
No. 9 Out Ring Indicator (RI)
NOTE
* Railway installation close to the rails.
For a cable located inside 3 m boundary and connected to this port, the use of shielded cable is
recommended, this is to minimise the risk of interference.The cable shield should be properly
connected (360°) to an earthing point within 1 m from this port. This earthing point should have
a low impedance connection to the conductive enclosure of the apparatus cabinet, or similar,
where the unit is built-in. This conductive enclosure should be connected to the earthing system
of an installation and may be directly connected to the protective earth.

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LED Status Description
PWR ON In service
OFF Out of service
NET ON Modem switched ON, Not registered on network
OFF Modem switched OFF
Slow Flash Modem switched ON, registered on the network
Quick Flash Modem switched ON, registered on the network,
communication in progress
TD ON Data received on the RS-232 or RS-485 port
OFF No data received on the RS-232 or RS-485 port
RD ON Data transmitted on the RS-232 or RS-485 port
OFF No data transmitted on the RS-232 or RS-485 port
RTS ON RTS signal active on the RS-232 port
OFF RTS signal inactive on the RS-232 port
DTR ON DTR signal active on the RS-232 port
OFF DTR signal inactive on the RS-232 port
DCD ON DCD signal active on the RS-232 port
OFF DCD signal inactive on the RS-232 port
Status OFF RSSI (Received Signal Strength Indicator)*
0 ≤RSSI ≤9 (–113 dBm to –95 dBm)
Flash 25% 10 ≤RSSI ≤14 (–93 dBm to –85 dBm)
ON
Flash 50% 15 ≤RSSI ≤19 (–83 dBm to –75 dBm)
ON
Flash 75% 20 ≤RSSI ≤24 (–73 dBm to –65 dBm)
ON
ON 25 ≤RSSI ≤31 (–63 dBm to –51 dBm)
LED Indicators
PWR
NET
RD
TD
* Function needs to be activated with S1:2

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DIP-switch settings
DIP-switches under the lid on top of the unit
Before DIP-switch settings:
Warning! Do not open connected unit
Hazardous voltages may occur within this unit
when connected to a power supply.
Warning!
Prevent damage to internal electronics from electrostatic
discharges (ESD) by discharging your body to a ground-
ing point (e.g. use of wrist strap), before the lid on top of
the unit is removed.
NOTE DIP-switch alterations are only effective after a power on or after a software
reset command (AT+CFUN=1).
A setting configured by any other method during normal operation, overrides
the DIP-switch setting. However, at power up, the DIP-switch settings have
precedence over the setting configured by any other method.
!
Factory default setting
ON
1234
Used stored settingS1
Status LED indication
ON
1234
Status LED not used
LED is OFF
S1
ON
1234
Status LED indicates signal
strength, see description of
LED indicators (page 14)
S1
S1
Windows configuration tool GD-Tool
The GD-Tool is a PC – application program with a graphical interface for easy
configuration of the complex functions found in the GDW-11.
Please refer to GD-Tool for a complete description of the functionality of the
Windows program.

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Start up guide
Follow the steps below to get the unit up and running in a simple application
Default settings of the serial interface are:
… AT+IPR=115200 115200 bit/s
… AT+ICF=3,4 8 databits, no parity and 1 stop bit.
… AT+IFC=0,0 RTS/CTS flow control disabled
… AT&D0 DTR is set to call control.
Start up steps:
… Insert a valid SIM-card with the appropriate services enabled (e.g CSD data
services. GPRS etc)
… Make sure the antenna is connected and placed in the best possible position.
… Power ON the unit and make sure that the PIN code control of the SIM-card
is disabled.This can be done either with the help of a mobile phone or with the
command AT+CLCK. If the PIN code should be enabled in the application, make
sure that the correct PIN code is sent to the modem with the command
AT+CPIN
… Check on the front of the unit that the NET LED is flashing, this means that
the unit has a connection to the GSM network and that it has registered on
the network.
… Check the received signal quality with the command AT+CSQ.The result value
of the first parameter should be between 10 and 31, the value of the second
parameter should always be 0.

18 6615-2200
Configuration
The GDW-11 can be configured from the local DTE interface.When the local interface is
used the configuration can be made with AT-commands on the serial interface, or with a
PC-based application configuration tool. Factory default settings can also be obtained by
using a DIP switch locally.
AT-Commands
The most commonly used commands are listed below.
Please refer to the document “GDW-11 AT-Command Guide” for a complete list of all
the available AT-commands and a detailed description of the serial AT-command interface.
+CLCK – Facility lock (PIN code control)
This command is used to control (lock or unlock) or show status of an ME or a network
facility.
A common ME function related to this command is to enable or disable the PIN code on
the SIM.
Refer to the complete AT-Command guide for more information.
Syntax:
AT+CLCK = <fac>, <mode>, <password>
Parameters:
<fac>
“SC” PIN code control.
More values for <fac> exists, see +CPWD.
<mode>
0 Disable the facility.
1 Enable the facility.
2 Query status.
Example:
AT+CLCK = ”SC”, 0, 1234 ;disables the PIN code.
+CPIN – Enter PIN code
This command is used to enter passwords required by the unit.The most common pass-
word used in a ME is the PIN code. Please refer to the complete AT-command manual for
more information.
Syntax:
AT+CPIN = <pincode>
Parameters:
<pincode>
4 to 8 digits.
Example:
AT+CPIN = 1234 ;enter the PIN code.

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+CPWD – Change password
Description:
This command is used by the application to change a password (PIN, call barring, NCK,
etc.).The facility values <fac>) are the same as for the +CLCK command with a “P2”
facility to manage SIM PIN2. For the network lock (“PN”), unlocking is forbidden after
10 failed attempts to disable (unlock) the network lock with an incorrect password.
Syntax:
AT+CPWD= <fac>, <oldpwd>, <newpwd>
Parameters:
<fac>
"PS" SIM lock facility with a 8 digits password.
"SC" PIN enabled (<mode> = 1) / disabled (<mode> = 0).
"AO" BAOC (Barr All Outgoing Calls).
“OI” BOIC (Barr Outgoing International Calls).
“OX” BOIC-exHC (Barr Outgoing. International Calls except to Home Country).
“AI” BAIC (Barr All Incoming Calls).
“IR” BIC-Roam (Barr Incoming When Roaming outside Home Country).
“AB” All Barring services.
“AG” All outGoing barring services.
“AC” All inComing barring services.
“PN” Network lock with a 8 digits password (NCK).
“PU” Network Subset lock with a 8 digits password (NSCK).
“PP” Service Provider lock with a 8 digits password (SPCK).
“PC” Corporate lock with a 8 digits password (CCK).
"P2" SIM PIN2.
<oldpwd>, <newpwd>
4 or up to 8 or 16 digits according to the facility.
Command example Possible responses Note
AT+CPWD=? +CPWD: (“PS”,8),(“SC”,8), Possible values,
(“AO”,4),(“OI”,4),(“OX”,4), CHV1/CHV2
(“AI”,4),(“IR,4),(“AB”,4), must be on 8 digits
(“AG”,4),(“AC”,4),(“P2”,8), maximum (4mn), For call
(“FD”,8),("PN",8),("PU",8), barring, on 4 digits maximum
("PP",8), ("PC",8)
OK
AT+CPWD=”SC”,1234,5555 OK Change PIN, PIN was
correct
AT+CPWD=”SC”,1234,5555 +CME ERROR: 16 Change PIN, PIN was
wrong
AT+CPIN=5555 OK Enter PIN, PIN was
correct
AT+CPWD=”PN”,12345678, OK Change NCK, NCK
00000000 changed for net lock

20 6615-2200
+CSQ – Received signal strength
This command is used to check the Received Signal Strength Indication (RSSI) and the
Bit Error Rate (BER).The command can be used with or without a SIM card inserted.
Syntax:
AT+CSQ.
Response syntax:
+CSQ: <RSSI>, <BER>
Parameters:
<RSSI>
0 –113 dBm or less.
1 –111 dBm.
2 to 30 –109 to –53 dBm.
31 –51 dBm or greater.
99 Not known.
<BER>
0 BER < 0.2%
1 0.2% < BER < 0.4%
2 0.4% < BER < 0.8%
3 0.8% < BER < 1.6%
4 1.6% < BER < 3.2%
5 3.2% < BER < 6.4%
6 6.4% < BER < 12.8%
7 BER > 12.8%
99 Not known.
Example:
AT+CSQ ;Checks the received signal level and quality of the wireless link.
&D – DTR control
This command controls the Data Terrminal Ready (DTR) signal in the RS-232 interface.
Syntax:
AT&Dn
<n>
0 The DTR signal is ignored.
1 Modem switches from data to command mode when DTR swtches from
ON to OFF.
2 An active call is released when DTR switches from ON to OFF.
Example:
AT&D0 ;The unit will ignore the state of DTR signal.