Logicbus LBGSMMODEM31 User manual
List of abbreviations
ACM Accumulated Call Meter MO Mobile Originated
AT ATtention (prefix for modem commands) MS Mobile Station
CS Coding Scheme MT Mobile Terminated
CTS Clear To Send NC Not Connected
DC Direct Current PCL Power Control Level
DCD Data Carrier Detect PDP Packet Data Protocol
DCE Data Communication Equipment PDU Protocol Data Unit
DCS Digital Cellular System PIN Personal Identification Number
DSR Data Set Ready PLMN Public Land Mobile Network
DTE Data Terminal Equipment PSTN Public Switched Telephone Network
DTR Data Terminal Ready PUK Personal Unblocking Key
EMI Electro Magnetic Interference RF Radio Frequency
ESD Electro Static Discharges RFI Radio Frequency Interference
FAQ Frequently Asked Question RI Ring Indicator
GND GrouND RTS Request To Send
GPRS General Packet Radio Service RX Receive
GSM Global System for Mobile communications SIM Subscriber Identification Module
I/O Input / Output SMS Short Message Service
ISDN Integrated Service Digital Network TX Transmit
LED Light Emitting Diode VRMS Volt Root Mean Square
ME Mobile Equipment VSWR Voltage Standing Wave Ratio
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Table of Contents
1
General description..................................................................................5
1.1 Introduce.....................................................................................................................5
1.2 Features.......................................................................................................................5
1.3 External connections..................................................................................................6
1.4 Package content..........................................................................................................7
2
Functional description...........................................................................
8
2.1 Architecture ...............................................................................................................8
2.2 RS232 serial link........................................................................................................8
3
Characteristics........................................................................................
10
3.1 Basic services.............................................................................................................10
3.2 Physical characteristics............................................................................................11
3.3 Electrical characteristics..........................................................................................11
3.4 Environmental characteristics ................................................................................12
4
Using the modem ...................................................................................
13
4.1 Getting started with the modem..............................................................................13
4.2 Operational status of the modem............................................................................14
4.3 Verifying the received signal strength.....................................................................14
4.4 Verifying the network registration of the modem..................................................14
5
AT commands for the modem...............................................................
15
6
Troubleshooting.....................................................................................
16
6.1 No connection with the modem through the serial link........................................ 16
6.2 Receiving “ERROR” message.................................................................................17
6.3 Receiving “No carrier” message..............................................................................19
7
Safety recommendations.......................................................................21
7.1 General Safety...........................................................................................................21
7.2 Vehicle Safety............................................................................................................22
7.3 Care And Maintenance ............................................................................................22
7.4 Your Responsibility ..................................................................................................23
8
Proper Usage..........................................................................................
24
8.1 Use accessories in the original packaging...............................................................24
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8.2 Prevent embezzlement..............................................................................................24
8.3 Proper usage..............................................................................................................24
9
Quality guarantee ...................................................................................
24
10
GPRS Modem Internet Access setup guide .........................................
25
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1 General description
1.1 Introduce
The modem is a self-contained E-GSM/GSM-GPRS 900/1800 dual-band
modem and is GPRS class 10 capable.
This modem supports the following transmissions:
¾Data,
¾Fax,
¾Short Messages (Point to point and Cell Broadcast),
¾Voice calls.
The modem comprises several interfaces:
¾LED function indicating the operating status,
¾External antenna (via SMA connector),
¾RS232 Serial (via 9-pin SUB HD connector),
¾Power supply (via 2.5mm DC power jack),
¾SIM card holder.
1.2 Features
The main features of the modem are the following:
¾2 Watts E-GSM 900 radio section.
¾1 Watt GSM1800 radio section.
¾Echo Cancellation + noise reduction.
¾Full GSM or GSM / GPRS software stack.
¾Hardware GPRS class 10 capable.
¾Complete shielding.
¾A DC Power supply.
¾A RS232 serial link.
¾A 1.8V / 3.3V SIM interface.
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1.3 External connections
fig. 1 Modem Presentation
The modem has three external connections:
¾Antenna connector: SMA connector for RF connection to the antenna,
¾Sub D high density 9-pin connector for RS232 serial link connection,
¾Power supply connector: 2.5mm power jack for DC Power Supply.
1.3.1 Power supply connector
fig. 2 Power supply connector
1.3.2 Antenna connector
fig. 3 Antenna connector
1.3.3 Sub HD 9-pin connector
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fig. 4 Sub HD 9-pin connector
Pin # Signal
(EIA / CCITT) I/O I/O type Description Comment
1 DCD / CT109 O RS232
STANDARD RS232
Data Carrier Detect
2 TX / CT103 O RS232
STANDARD RS232
Transmit serial data
3 RX / CT104 I RS232
STANDARD RS232
Receive serial data
4 DTR / CT108-2 I RS232
STANDARD RS232
Data Terminal Ready
5 GND - GND Ground
6 DSR / CT107 O RS232
STANDARD RS232
Data Set Ready
7 CTS / CT106 O RS232
STANDARD RS232
Clear To Send
8 RTS / CT105 I RS232
STANDARD RS232
Request To Send
9 RI / CT125 O RS232
STANDARD RS232
Ring Indicator
1.4 Package content
The modem package includes:
¾modem ×1 □
¾External AC adapter ×1 □
¾RS-232 connecting cable ×1 □
¾0dBi Antenna ×1 □
¾User’s manual ×1 □
¾Warranty Card ×1 □
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2 Functional description
2.1 Architecture
fig. 5 Modem Functional architecture
2.2 RS232 serial link
2.2.1 General presentation
The RS232 interface performs the voltage level adaptation (V24/CMOS⇔
V24/V28) between the internal SIMCOM module (DCE) and the external world
(DTE).
The RS232 interface is protected (by ESD protection) against electrostatic
surges on the RS232 lines.
Filtering guarantees:
¾EMI/RFI protection in input and output,
¾Signal smoothing.
A flexible 6-wire serial interface is available complying with RS232 protocol
signaling.
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The signals available are:
¾TX data (TX / CT103),
¾RX data (RX / CT104),
¾Request To Send (RTS / CT105),
¾Clear To Send (CTS / CT106),
¾Data Terminal Ready (DTR / CT108-2),
¾Data Set Ready (DSR / CT107).
The 2 additional signals are Data Carrier Detect (DCD / CT109) and Ring
Indicator (RI / CT125).
fig. 6 RS232 Serial Link signals
RS232 interface has been designed to allow a certain flexibility in the use of
the serial interface signals. However, the use of TX, RX, CTS and RTS signals
is mandatory which is not the case for DTR, DSR, DCD and RI signals which
can be not used.
2.2.2 Pin out description
Signal Pin # I/O I/O type
RS232 STANDARD Description
TX / CT103 2 O TX Transmit serial data
RX / CT104 3 I RX Receive serial data
RTS / CT105 8 I RTS Request To Send
CTS / CT106 7 O CTS Clear To Send
DSR / CT107 6 O DSR Data Set Ready
DTR / CT108-2 4 I DTR Data Terminal Ready
DCD / CT109 1 O DCD Data Carrier Detect
RI / CT125 9 O RI Ring Indicator
GND / CT102 5 - GND Ground
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3 Characteristics
3.1 Basic services
The basic services of the modem are given in the table below.
GSM DCS
Standard
Interface
SMS
Data
Fax
GPRS
900 MHz
E-GSM compliant
Class 4 (2W).
GSM phase 2.
Serial interface RS232 V.24/V.28
AT command set based on V.25ter
and GSM 07.05 & 07.07.
Auto-bauding function between
2400 bits/s and 19200 bits/s
No auto-framing available
Mobile Originated (MO) and
Mobile Terminated (MT).
Mode Text & PDU point to point.
Cell broadcast.
In accordance with GSM 07.05
Asynchronous 2400, 4800,
9600 and 14400 bits/s.
Transparent and Non-Transparent
mode
In Non Transparent Mode: 300,
1200, 1200/75 bauds.
Mode 3.1 kHz (PSTN) and V110
(ISDN)
2400/4800/7200/9600 bits/s,
GSM teleservice 62 in
Transparent Mode.
Class 1 & Class 2.
Group 3 compatible.
Class 10.
Coding schemes: CS1 to CS4
Compliant with SMG31bis
1800 MHz
E-GSM compliant
Class 1 (1W)
GSM phase 2.
Serial interface RS232 V.24/V.28
AT command set based on V.25ter
and GSM 07.05 & 07.07.
Auto-bauding function between
2400 bits/s and 19200 bits/s
No auto-framing available
Mobile Originated (MO) and
Mobile Terminated (MT).
Mode Text & PDU point to point.
Cell broadcast.
In accordance with GSM 07.05
Asynchronous 2400, 4800,
9600 and 14400 bits/s.
Transparent and Non-Transparent
mode
In Non Transparent Mode: 300,
1200, 1200/75 bauds.
Mode 3.1 kHz (PSTN) and V110
(ISDN)
2400/4800/7200/9600 bits/s,
GSM teleservice 62 in
Transparent Mode.
Class 1 & Class 2.
Group 3 compatible.
Class 10.
Coding schemes: CS1 to CS4
Compliant with SMG31bis
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3.2 Physical characteristics
Dimensions 98mm×54mm×25mm (without connectors)
Overall Dimension 110mm×54mm×25mm
Weight < 130g
Volume 132.3 cm3
Housing Aluminum profiled
3.3 Electrical characteristics
3.3.1 Power supply
Table 1: Electrical characteristics
5 V to 32 V DC (GSM or DCS).
Operating Voltage ranges 5.5 V to 32 V DC (GPRS Class 10).
Maximum current 480 mA Average at 5.5V.
1.7 A Peak at 5V.
Note: the modem is permanently powered once the power supply is connected. The
following table describes the consequences of over voltage and under voltage with the
GSM/GPRS Modem.
Table 2: Effects of power supply defect
If the voltage: Then:
falls below 5V The GSM communication is not guaranteed.
falls below 5.5V The GPRS Class 10 is not guaranteed.
Voltage over 32V
(Transient peaks) The modem guarantees its own protection.
Voltage over 32V
(continuous overvoltage) Protection of the modem by the fuse (the
supply voltage is disconnected).
The following table provides information on power consumption of the
Fastrack modem, assuming an operating temperature of +25 °C and using a 3 V SIM
card.
3.3.2 RF characteristics
3.3.2.1 Frequency ranges Table 4: Frequency ranges
Characteristic E-GSM 900 DCS 1800
Frequency TX 880 to 915 MHz 1710 to 1785 MHz
Frequency RX 925 to 960 MHz 1805 to 1880 MHz
3.3.2.2 RF performances
RF performances are compliant with the ETSI recommendation GSM 05.05.
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The RF performances for receiver and transmitter are given in the table below.
Table 5: Receiver and transmitter RF performances
Receiver
E-GSM900 Reference Sensitivity -104 dBm Static & TUHigh
DCS1800 Reference Sensitivity -102 dBm Static & TUHigh
Selectivity @ 200 kHz > +9 dBc
Selectivity @ 400 kHz > +41 dBc
Linear dynamic range 63 dB
Co-channel rejection >= 9 dBc
Transmitter
Maximum output power (E-GSM 900)
at ambient temperature 33 dBm +/- 2 dB
Maximum output power (DCS1800)
at ambient temperature 30 dBm +/- 2 dB
Minimum output power (E-GSM 900)
at ambient temperature 5 dBm +/- 5 dB
Minimum output power (DCS1800)
at ambient temperature 0 dBm +/- 5 dB
3.3.2.3 External antenna
The external antenna is connected to the modem via the SMA connector.
The external antenna must fulfill the characteristics listed in the table below.
Table 6: External antenna characteristics
Antenna frequency range Dual-band GSM 900/DCS 1800 MHz
Impedance 50 Ohms
Gain (antenna + cable) 0 dBi
VSWR (antenna + cable) -10 dB
Note: refer to chapter 8 for recommended antenna.
3.3.3 SIM card
Table 7: SIM card characteristics
SIM card 1.8V or 3.3V
3.4 Environmental characteristics
To ensure the proper operation of the Modem, the operating environment must be within
a specific temperature as described in the table below.
Table 9: Ranges of temperature
Operating temperature range -20 °C to +55 °C
Storage temperature range -25 °C to +70°C
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4 Using the modem
4.1 Getting started with the modem
4.1.1 Setting up the modem
To set up the modem, do the following:
1 Press SIM card holder ejector (yellow button) with a sharp object (the tip of a
pen for example).
2 Insert the SIM card in the holder.
3 Verify the SIM card fits in the holder properly.
4 Connect the antenna to the SMA connector.
5 Connect both sides of the serial cable (9-pin Sub HD connector on the modem
side).
6 Connect the power supply cable to the power supply source.
Note: for automotive application, it is recommended to connect the V+ line of
the modem directly to the positive terminal of the battery.
7 Plug the power supply cable into the modem and switch on the external power
supply.
8 Now the modem is ready to work. Refer to chapter 5 for some AT commands
to configure the modem.
4.1.2 Checking the communication with the modem
Connect the RS232 link between the DTE (port COM) and the modem (DCE). Configure
the RS232 port of the DTE as follows:
¾Bits per second: 115.200 kbps,
¾Data bits: 8,
¾Parity: None,
¾Stop bits: 1,
¾Flow control: Hardware Flow control.
Using a communication software such as HyperTerminal program, enter the AT
↵
command. The response of the modem must be OK displayed in the HyperTerminal
window.
If the communication cannot be established with the modem, do the following:
¾Check the RS232 connection between the DTE and the modem (DCE),
¾Check the configuration of the port COM used on the DTE.
Example of AT commands which can be used after getting started the modem:
¾AT+CGMI: modem answer is “WAVECOM MODEM” when serial link is OK.
¾AT+CPIN=<Pin Code>: to enter a PIN code (if activated).
¾AT+CSQ: to verify the received signal strength.
¾AT+CREG?: to verify the registration of the modem on the network.
¾ATD<phone number>;: to initiate a call.
¾ATH: to hang up (end of call).
For further information about these AT commands and their associated parameters, refer
to document [1].
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4.2 Operational status of the modem
The operational status of the modem is given by the LED light located on the front panel of
the modem. The table below gives the meaning of the various statuses available.
Table 10: Operational status of the modem
LED Status LED light activity Modem status
LED ON permanent Modem is switched on
Not registered on the network
LED Flashing slowly Idle mode
Connected to the network
ON
LED Flashing rapidly Transmission mode
OFF LED OFF Modem is switched off
4.3 Verifying the received signal strength
The modem establishes a call only if the received signal is sufficiently strong. To verify
the received signal strength, do the following:
Using a communication software such as HyperTerminal program, enter the AT command
AT+CSQ. Value appears for the received signal strength.
Verify the result with the values given in the table below.
Table 11: Values of received signal strength
Value of received signal strength
(AT+CSQ response) Interpretation of the
received signal strength
0 - 10 Insufficient(*)
11 - 31 Sufficient(*)
Greater than 99 Insufficient(*)
(*) Based on general observations.
4.4 Verifying the network registration of the modem
1. Make sure a valid SIM card has been previously inserted in the SIM card holder of the
modem.
2. Using a communication software such as HyperTerminal program, enter the following
AT command: AT+CREG?. Value appears as a response.
3. Verify the result with the values given in the table below.
Table 12: Values of network registration
Value(*) Network registration
0,1 Yes
0,5 Yes (registered roaming)
(*) refer to AT commands documentation [1] for further information about the other
returned values and their meaning.
If the modem is not registered, perform the following procedure:
¾Check the connection between the modem and the antenna.
¾Verify the signal strength to determine the strength of the received signal (refer to
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paragraph 4.3).
5 AT commands for the modem
The table below reminds the main AT commands required for getting started the modem.
For other AT commands available or further information about the AT commands, refer to
document [1].
Description AT commands Modem’s response Comment
OK PIN Code accepted.
+CME ERROR: 16 Incorrect PIN Code
(with +CMEE = 1 mode).
Enter PIN Code AT+CPIN=1234
+CME ERROR: 3 PIN already entered
(with +CMEE = 1 mode).
CREG=<mode>, 1 Modem synchronised on the
network.
CREG=<mode>, 2 Synchronization lost,
resynchronization attempt.
Modem
synchronization
checking
AT+CREG?
CREG=<mode>, 0 Modem not synchronized on
the network, no
synchronization attempt.
Receiving an
incoming call
ATA OK Answer the call.
OK Communication established.
CME ERROR: 11 PIN code not entered (with
+CMEE = 1 mode).
Initiate a call ATD<phone number>;
(Don’t forget the “ ; ” at the
end for « voice » call)
CME ERROR: 3 AOC credit exceeded or a
communication is already
established.
Communication
loss
NO CARRIER
Hang up ATH OK
Store the
parameters in
EEPROM
AT&W OK The configuration settings are
stored in EEPROM.
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6 Troubleshooting
This section of the document describes possible problems encountered when using the
modem and their solutions.
6.1 No connection with the modem through the serial link
If the modem does not answer through the serial link, refer to the table below for possible
causes and solutions.
Table 13: Solutions for no connection with modem through serial link
If the modem
returns… Then ask Action
Is the modem powered
correctly? Provide a power supply in
the range of 5 V (5.5V for
GPRS Class 10) to 32 V.
Does the serial cable follow
correctly pin assignment
shown in paragraph 1.2.1.3.
Connect the cable by
following pin assignment
given in paragraph 1.2.1.3.
Is the communication
program properly
configured?
Ensure the setting of the
communication program is
fit to setting of modem.
Modem factory setting is:
Data bits = 8
Parity = none
Stop bits = 1
Baud = 115.200 kbps.
Flow control = Hardware
Nothing
Is there another program
interfering with the
communication program
(i.e. Conflict on
communication port
access)
Close the application (e.g.
mouse or printer driver).
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6.2 Receiving “ERROR” message
If the modem returns a message of ERROR upon an attempted transmission of data, or
voice signals, then refer to the table below for possible causes and solutions.
Table 14: Solutions for “ERROR” message
If the modem
returns…
Then ask Action
Is the modem registered on the
Refer to paragraph 4.4 to
network?
verify that the modem is
registered on the network.
Is the modem receiving an
incoming call or is it already in
communication?
End any incoming by using
ATH command.
Is the selected bearer type
supported by the called party?
Is the selected bearer type
supported by the network?
Enter AT+CMEE to view the
extended error code.
Note: Refer to Table 15.
Ensure that the selected bearer
type is supported by the called
party.
Ensure that the semicolon (;) is
entered immediately after the
phone number in theAT
command.
e.g. ATD######;
Is the received signal strong
enough?
Refer to paragraph 4.3 to
verify the strength of the
received signal.
ERROR
Is the antenna properly
connected?
Refer to paragraph 3.3.2.3 for
antenna requirements
If the modem returns a message of ERROR, you can have the extended error code by
using AT command AT+CMEE=1. Refer to the table below for interpretation of extended
error code.
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Table 15: Interpretation of extended error code
Error
Code Diagnostic Hint
0 Phone failure Call your technical support.
3 Operation not allowed
4 Operation not supported No action.
10 SIM not inserted If SIM card is inserted, check the SIM card if it is
clean and properly inserted.
11 SIM PIN required Enter PIN code.
12 SIM PUK required Enter PUK code.
Note: Call your network provider if you don’t know
this code.
13 SIM Failure Check validity of your SIM card. If SIM card
damaged, call your network provider.
16 Incorrect password Check the code you entered.
17 SIM PIN2 required Enter PIN2 code.
18 SIM PUK2 required Enter PUK2 code (call your network provider if you
don’t know this code).
26 Dial string too long Check your phone number (max 20 digits).
30 No network service No action.
32 Network not allowed Emergency
calls only No action.
40 Network personalization PIN
required (Network lock) Enter Network lock code (call your network
provider if you don’t know this code).
103 Illegal MS (#3) No action.
106 Illegal ME (#6) No action.
107 GPRS services not allowed (#7) Contact your network provider to subscribe to the
GPRS services.
111 PLMN area not allowed (#11) No action.
112 Location area not allowed (#12) No action.
113 Roaming not allowed in this
location area (#13) No action.
132 Service option not supported
(#32) Check the service option.
133 Requested service option not
subscribed (#33) Call your network provider to subscribe to the
requested service option.
134 Service option temporarily out of
order (#34) No action.
148 Unspecified GPRS error No action.
149 PDP authentication failure Call your network provider to know the right
authentication parameters.
150 Invalid mobile class Change the class of the mobile to a valid one.
Note: For all other codes, and/or details, refer to AT commands documentation.
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6.3 Receiving “No carrier” message
If the modem returns a message of No carrier upon an attempted transmission of data, or
voice signals, then refer to the table below for possible causes and solutions.
Table 16: Solutions for “No carrier” message
If the modem
returns… Then ask… Action…
Is the received signal strong
enough? Refer to paragraph 4.3 to
verify the strength of the
received signal.
No carrier
Is the antenna properly
connected? Refer to paragraph 3.3.2.3
for antenna requirements.
No carrier (when trying to
issue a voice
communication)
Is the semicolon (;) entered
immediately after the phone
number in the AT
command?
Ensure that the semicolon
(;) is entered immediately
after the phone number in
the AT command.
e.g. ATD######;
Is SIM card configured for
data / fax calls? Configure the SIM card for
data / fax calls (Ask your
network provider if
necessary).
No carrier (when trying to
issue a data
communication)
Is the selected bearer type
supported by the called
party?
Is the selected bearer type
supported by the network?
Ensure that the selected
bearer type is supported by
the called party.
Ensure that the selected
bearer type is supported by
the network.
If no success, try bearer
selection type by AT
command:
AT+CBST=0,0,3
If the modem returns a message of No carrier, you can get the extended error code by
using AT command AT+CEER. Refer to the table below for interpretation of extended error
code.
Table 17: Interpretation of extended error code
Error Code Diagnostic Hint
1 Unallocated phone number Not applicable.
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16 Normal call clearing
17 User busy
18 No user responding
19 User alerting, no answer
21 Call rejected
22 Number changed
31 Normal, unspecified
50 Requested facility not
subscribed
Check your subscription (data
subscription available?).
68 ACM equal or greater than
ACM max
Credit of your pre-paid SIM
card expired.
252 Call barring on outgoing calls
253 Call barring on incoming calls
Not applicable.
3, 6, 8, 29,
34, 38, 41,42,
43, 44, 47,
49, 57, 58,
63, 65, 69,
70, 79, 254
Network causes See AT commands manual for
further details or call network
provider.
Note: For all other codes, and/or details, see AT commands documentation.
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