Sony 6220502-BV User Manual
Integrator’s Manual
Product Photo/Illustration
GM28
SAR statement: This product is intended to be used with the antenna or other
radiating element at least 20cm away from any part of the human body.
The information contained in this document is the proprietary information of
Sony Ericsson Mobile Communications International. The contents are
confidential and any disclosure to persons other than the officers, employees, agents
or subcontractors of the owner or licensee of this document, without the prior written
consent of Sony Ericsson Mobile Communications International, is strictly
prohibited. Further, no portion of this publication may be reproduced, stored in a
retrieval system, or transmitted in any form or by any means, electronic or
mechanical, including photocopying and recording, without the prior written consent
of Sony Ericsson Mobile Communications International, the copyright holder.
First edition (November 2002)
Sony Ericsson Mobile Communications International publishes this manual
without making any warranty as to the content contained herein. Further
Sony Ericsson Mobile Communications International reserves the right to make
modifications, additions and deletions to this manual due to typographical errors,
inaccurate information, or improvements to programs and/or equipment at any time
and without notice. Such changes will, nevertheless be incorporated into new editions
of this manual.
All rights reserved.
© Sony Ericsson Mobile Communications International, 2002
Publication number: LZT 123 7468 P1A
Printed in UK
Contents
Part 1: Overview................................................................................................. 11
1. Introduction............................................................................................................ 13
1.1 Target Users ......................................................................................... 13
1.2 Prerequisites ......................................................................................... 13
1.3 Manual Structure ......................................................................................... 13
2. GM28 Modem......................................................................................................... 14
2.1 Description ......................................................................................... 14
2.2 Highlights ......................................................................................... 14
2.3 GM28 in a Communication System............................................................. 15
2.4 Main Features and Services ......................................................................... 17
2.4.1 Types of Mobile Station .................................................................. 17
2.4.2 Short Message Service .................................................................... 17
2.4.3 Voice Calls...................................................................................... 18
2.4.4 Data................................................................................................. 18
2.4.5 Fax ..................................................................................................18
2.4.6 Supplementary Services .................................................................. 18
2.4.7 Serial Communication .................................................................... 19
2.4.8 Interfacing with the GM28.............................................................. 19
2.5 Service and Support ..................................................................................... 20
2.6 Precautions ......................................................................................... 20
3. Abbreviations .........................................................................................................21
Part 2: Integrating the Modem............................................................................ 23
1. Mechanical Description ......................................................................................... 25
1.1 Overview ......................................................................................... 25
1.2 Physical Dimensions .................................................................................... 27
2. Electrical Description ............................................................................................ 28
2.1 Power Connector ......................................................................................... 28
2.2 Audio Connector ......................................................................................... 29
2.3 Antenna Connector....................................................................................... 31
2.4 SIM Card Reader ......................................................................................... 32
2.5 RS232 Serial Port......................................................................................... 33
2.5.1 Serial Data...................................................................................... 34
2.5.2 Serial Data Signals - RD, TD ......................................................... 34
2.5.3 Control Signals - RTS, CTS, DTR, DSR, DCD, RI ......................... 34
2.6 Real Time Clock ......................................................................................... 35
2.7 Software Updates ......................................................................................... 35
3. Operation ................................................................................................................ 36
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3.1 Switching On the Modem............................................................................. 36
3.2 Switching Off the Modem ............................................................................ 36
3.3 Resetting the Modem.................................................................................... 36
3.4 Operating States/LED................................................................................... 37
4. Hints for Integrating the Modem..........................................................................38
4.1 Safety Advice and Precautions ..................................................................... 38
4.1.1 General............................................................................................38
4.1.2 SIM Card .........................................................................................38
4.1.3 Antenna............................................................................................39
4.2 Installation of the Modem............................................................................. 39
4.2.1 Where to Install the Modem ............................................................39
4.2.2 How to Install the Modem ...............................................................41
4.3 Antenna .......................................................................................... 41
4.3.1 General............................................................................................41
4.3.2 Antenna Type...................................................................................42
4.3.3 Antenna Placement..........................................................................42
4.3.4 The Antenna Cable ..........................................................................42
4.3.5 Possible Communication Disturbances...........................................43
4.4 Attachments .......................................................................................... 43
5. Technical Data ........................................................................................................44
Part 3: Using AT Commands.............................................................................. 49
1. Introduction to AT Commands.............................................................................51
1.1 Overview .......................................................................................... 51
1.2 Syntax Description ....................................................................................... 51
1.2.1 Conventions .....................................................................................51
1.2.2 AT Command Syntax .......................................................................52
1.2.3 AT Response Syntax.........................................................................53
1.3 Error Codes .......................................................................................... 55
1.3.1 +CME ERROR (Mobile Equipment Error Code) ...........................55
1.3.2 +CMS ERROR (Message Service Failure Result Code).................56
1.4 Examples on How to Use the AT Commands............................................. 57
2. Call Control.............................................................................................................59
2.1 AT+CPIN PIN Control ...................................................................... 59
2.2 ATA Answer Incoming Call ..................................................... 59
2.3 ATD Dial................................................................................... 60
2.4 ATH Hang up ............................................................................ 62
2.5 ATO Return to Online Data Mode ............................................ 62
2.6 ATP Select Pulse Dialling ........................................................ 62
2.7 ATT Select Tone Dialling......................................................... 62
2.8 ATX Call Progress Monitoring Control.................................... 63
2.9 AT+CHUP Hang up Call .................................................................... 63
2.10 AT+CMOD Call Mode......................................................................... 64
2.11 AT+CVHU Voice Hang-Up ................................................................ 65
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2.12 AT+VTS DTMF and Tone Generation ........................................... 65
3. Control and Status ................................................................................................. 67
3.1 ATQ Result Code Suppression ................................................. 67
3.2 ATS0 Automatic Answer Control.............................................. 67
3.3 ATS2 Escape Sequence Character ............................................. 68
3.4 ATS3 Command Line Termination Character ........................... 68
3.5 ATS4 Response Formatting Character....................................... 69
3.6 ATS5 Command Line Editing Character (BACKSPACE)........ 70
3.7 ATS6 Blind Dial Delay Control................................................. 70
3.8 ATS7 Connection Completion Timeout .................................... 71
3.9 ATS8 Comma Dial Modifier Delay Control.............................. 71
3.10 ATS10 Automatic Disconnect Delay Control.............................. 72
3.11 AT*ECAM Ericsson Call Monitoring................................................. 72
3.12 AT*EDST Ericsson Daylight Saving Time ....................................... 73
3.13 AT*EMAR Ericsson Master Reset...................................................... 74
3.14 AT*EPEE Ericsson Pin Event........................................................... 74
3.15 AT+CCLK Set Clock and Date .......................................................... 75
3.16 AT+CEER Extended Error Report..................................................... 75
3.17 AT+CFUN Set Phone Functionality................................................... 76
3.18 AT+CIND Indicator Control.............................................................. 77
3.19 AT+CLAC List all available AT Commands ..................................... 78
3.20 AT+CMEE Mobile Equipment Error.................................................. 78
3.21 AT+CMER Mobile Equipment Event Reporting ................................ 79
3.22 AT+CPAS Phone Activity Status ...................................................... 80
3.23 AT+CPIN PIN Control...................................................................... 81
3.24 AT+CPWD Change Password............................................................. 83
3.25 AT+CR Service Reporting Control ............................................... 85
3.26 AT+CRC Cellular Result Code........................................................ 85
3.27 AT+CSAS Save Settings.................................................................... 86
3.28 AT+CSQ Signal Strength................................................................. 87
3.29 AT+CTZU Automatic Time Zone Update ......................................... 88
4. Audio ....................................................................................................................... 89
4.1 AT*E2EAMS Ericsson M2M Audio Profile Modification..................... 89
4.2 AT*E2APR M2M Audio Profile Manipulation................................... 95
4.3 AT*EALR Ericsson Audio Line Request .......................................... 97
4.4 AT*EAMS Ericsson Audio Mode Selection ...................................... 98
4.5 AT*EARS Ericsson Audio Ring Signal............................................. 99
4.6 AT*ELAM Ericsson Local Audio Mode .......................................... 100
4.7 AT*EMIC Ericsson Microphone Mode........................................... 100
4.8 AT*EMIR Ericsson Music Mute Indication Request ...................... 101
4.9 AT*EXVC Ericsson SET External Volume Control........................ 101
5. Data - CSD/HSCSD.............................................................................................. 103
5.1 AT+CBST Select Bearer Service Type............................................ 103
5.2 AT+CRLP Radio Link Protocol....................................................... 105
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GM28 INTEGRATOR’S MANUAL
6. Data - GPRS..........................................................................................................107
6.1 AT+CGACT PDP Context Activate or Deactivate.............................. 107
6.2 AT+CGATT GPRS Attach or Detach ................................................. 108
6.3 AT+CGDATA Enter Data State.............................................................. 109
6.4 AT+CGDCONT Define PDP Context ....................................................... 110
6.5 AT+CGEREP GPRS Event Reporting .................................................. 112
6.6 AT+CGPADDR Show PDP Address ........................................................ 113
6.7 AT+CGQMIN Quality of Service Profile (Minimum Acceptable)........ 114
6.8 AT+CGQREQ Quality of Service Profile (Requested) .......................... 116
6.9 AT+CGREG GPRS Network Registration Status ............................... 119
6.10 AT+CGSMS Select Service for MO SMS Messages .......................... 120
7. Data - HSCSD .......................................................................................................121
7.1 AT+CHSC HSCSD Current Call Parameters ................................... 121
7.2 AT+CHSD HSCSD Device Parameters............................................ 122
7.3 AT+CHSN HSCSD Non Transparent Call Configuration................ 123
7.4 AT+CHSR HSCSD Parameters Report ............................................ 124
7.5 AT+CHSU HSCSD Automatic User Initiated Upgrading ................ 125
8. Fax..........................................................................................................................127
8.1 AT*E2FAX Ericsson M2M Fax Comm. Baud Rate Modification .... 127
8.2 Low Level Fax Commands......................................................................... 128
9. Identification .........................................................................................................129
9.1 AT Attention Command ....................................................... 129
9.2 AT&F Set to Factory Defined Configuration ............................ 129
9.3 AT&W Store User Profile........................................................... 129
9.4 AT* List all Supported AT Commands.................................. 130
9.5 AT+CGMI Read MS Manufacturer Identification ........................... 130
9.6 AT+CGMM Read MS Model Identification....................................... 130
9.7 AT+CGMR Read MS Revision Identification ................................... 131
9.8 AT+CGSN Read MS Product Serial Number Identification ............ 131
9.9 ATI Identification Information .............................................. 131
9.10 AT+GCAP Request Modem Capabilities List .................................. 132
10. Interface ................................................................................................................133
10.1 AT+CPIN PIN Control .................................................................... 133
10.2 AT&C Circuit 109 (DCD) Control ............................................ 133
10.3 AT&D Circuit 108 (DTR) Response.......................................... 133
10.4 AT&S Circuit 107 (DSR) Response.......................................... 134
10.5 AT+WS46 Mode Selection............................................................... 134
10.6 ATE Command Echo.............................................................. 135
10.7 ATV DCE Response Format................................................... 135
10.8 ATZ Reset to Default Configuration ...................................... 136
10.9 AT+CMUX Switch to 07.10 Multiplex Protocol ............................... 137
10.10 AT+CRES Restore SMS Settings..................................................... 139
10.11 AT+ICF Cable Interface Character Format .................................. 139
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10.12 AT+IFC DTE-DCE Local Flow Control...................................... 140
10.13 AT+ILRR Cable Interface Local Rate Reporting ........................... 141
10.14 AT+IPR Cable Interface Port Command ..................................... 141
10.15 AT*E2ESC M2M Escape Sequence Guard Time ............................. 142
11. Network................................................................................................................. 143
11.1 AT*E2CD Ericsson M2M Cell Description .................................... 143
11.2 AT*E2EMM Ericsson M2M Engineering Monitoring Mode ............. 145
11.3 AT*E2SPN M2M Service Provider Indication ................................. 151
11.4 AT*EALS Ericsson Request ALS Status ........................................ 151
11.5 AT*ECSP Ericsson Customer Service Profile ................................ 152
11.6 AT*EPNR Ericsson Read SIM Preferred Network ......................... 153
11.7 AT*EPNW Ericsson Write SIM Preferred Network ........................ 154
11.8 AT*E2SSN Ericsson M2M SIM Serial Number............................... 154
11.9 AT*ESLN Ericsson Set Line Name................................................. 155
11.10 AT+CIMI Subscriber Identification................................................ 156
11.11 AT+CLCK Facility Lock .................................................................. 156
11.12 AT+CNUM Subscriber Number ........................................................ 158
11.13 AT+COLP Connected Line Identification Presentation................... 159
11.14 AT+COPS Operator Selection ......................................................... 161
11.15 AT+CREG Network Registration..................................................... 162
11.16 AT*ECPI Ciphering Indicator........................................................ 163
11.17 AT*E2NBTS Ericsson M2M Neighbour BTS ..................................... 165
12. Phonebook ............................................................................................................ 167
12.1 AT*E2PBCS Ericsson M2M Phonebook Check Sum......................... 167
12.2 AT*ESAG Ericsson Add to Group .................................................. 167
12.3 AT*ESCG Ericsson Create Group................................................... 168
12.4 AT*ESCN Ericsson Set Credit Card Number.................................. 169
12.5 AT*ESDG Ericsson Delete Group ................................................... 171
12.6 AT*ESDI Ericsson Delete Group Item........................................... 171
12.7 AT*ESGR Ericsson Group Read ..................................................... 172
12.8 AT*EGIR Ericsson Group Item Read............................................. 172
12.9 AT*ESNU Ericsson Settings Number.............................................. 173
12.10 AT+CPBF Phonebook Find............................................................. 174
12.11 AT+CPBR Phonebook Read ............................................................ 174
12.12 AT+CPBS Phone Storage ................................................................ 176
12.13 AT+CPBW Phonebook Write ........................................................... 177
13. Short Message Services - Point to Point............................................................. 179
13.1 AT+CPIN PIN Control.................................................................... 179
13.2 AT+CGSMS Select Service for MO SMS Messages.......................... 179
13.3 AT+CPMS Preferred Message Storage ............................................ 179
13.4 AT+CSCA Service Centre Address.................................................. 181
13.5 AT+CMGF Message Format ............................................................. 182
13.6 AT+CMGW Write Message to Memory ............................................ 182
13.7 AT+CMGS Send Message ................................................................ 185
13.8 AT+CMSS Send From Storage ........................................................ 188
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13.9 AT+CMGC Send Command .............................................................. 189
13.10 AT+CNMI New Message Indications to TE .................................... 192
13.11 AT+CMGR Read Message................................................................. 196
13.12 AT+CMGL List Message................................................................... 201
13.13 AT+CMGD Delete Message .............................................................. 207
13.14 AT+CSDH Show Text Mode Parameters ......................................... 207
13.15 AT+CSMP Set Text Mode Parameters ............................................. 208
13.16 AT+CSCS Select Character Set ....................................................... 209
13.17 AT+CSMS Select Message Service .................................................. 210
14. Short Message Services - Cell Broadcast............................................................213
14.1 AT+CNMI New Message Indications to TE .................................... 213
14.2 AT+CSCB Select Cell Broadcast Message Type ............................. 213
15. SIM Application Toolkit ......................................................................................215
15.1 AT+CPIN PIN Control .................................................................... 215
15.2 AT*E2STKS SIM Application Toolkit Settings .................................. 215
15.3 AT*E2STKD M2M STK Display Text ................................................ 216
15.4 AT*E2STKG M2M STK Get Inkey ..................................................... 217
15.5 AT*E2STKI M2M STK Get Input...................................................... 219
15.6 AT*E2STKL M2M STK Select Item ................................................... 222
15.7 AT*E2STKM M2M STK Set Up Menu................................................ 224
15.8 AT*E2STKN M2M STK Envelope (Menu Selection) ......................... 226
15.9 AT*E2STKC M2M STK Set Up Call .................................................. 226
15.10 *E2STKE STK Send Short Message............................................... 228
15.11 *E2STKP STK Send SS.................................................................. 229
15.12 *E2STKU STK Send USSD ............................................................ 230
15.13 *E2STKR STK Refresh ................................................................... 231
15.14 AT*E2STKTO SIM Application Toolkit Settings .................................. 231
16. Supplementary Services .......................................................................................233
16.1 AT+CPIN PIN Control .................................................................... 233
16.2 AT+CACM Accumulated Call Meter ................................................ 233
16.3 AT+CAMM Accumulated Call Meter Maximum............................... 234
16.4 AT+CAOC Advice of Charge ........................................................... 235
16.5 AT+CPUC Price Per Unit and Currency Table ................................ 236
16.6 AT*EDIF Ericsson Divert Function................................................ 237
16.7 AT*EIPS Identity Presentation Set ................................................ 238
16.8 AT*ELIN Ericsson Line Set............................................................ 239
16.9 AT*E2SSD M2M Supplementary Service Dispatch ......................... 239
16.10 AT*E2SSI M2M Supplementary Service Indications...................... 240
16.11 AT+CCFC Call Forwarding number and Conditions....................... 245
16.12 AT+CCWA Call Waiting ................................................................... 247
16.13 AT+CHLD Call Hold and Multiparty ............................................... 249
16.14 AT+CLIP Call Line Identification Presentation ............................. 250
16.15 AT+CLIR Calling Line Identification Restriction........................... 251
16.16 AT+CSSN Supplementary Service Notification .............................. 253
16.17 AT+CUSD Unstructured Supplementary Service Data .................... 255
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17. Alphabetical Listing of AT Commands ............................................................. 259
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GM28 INTEGRATOR’S MANUAL
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Part 1: Overview
Product Photo/Illustration
1. Introduction
1.1 Target Users
GM28 modems are designed to be integrated into machine-machine or
man-to-machine communications applications. They are intended to be
used by manufacturers, system integrators, applications developers and
developers of wireless communications equipment.
1.2 Prerequisites
It is assumed that the person integrating the GM28 into an application
has a basic understanding of the following:
• GSM networking;
• Wireless communication and antennas (aerials);
• AT commands;
• ITU-T standard V.24/V.28;
• Micro controllers and programming;
• Electronic hardware design.
1.3 Manual Structure
The manual is composed of four parts:
Part 1- Overview
This section provides a broad overview of the GM28 and includes a list
of abbreviations used in the manual.
Part 2 - Integrating the Modem
This section describes each of the signals available on the GM28
modem, along with mechanical information. The section also provides
you with design guidelines and explains what is needed to
commercialise an application from a regulatory point of view.
Part 3 - Using AT Commands
This section lists all the AT commands relevant to the GM28, including
their associated parameters. The purpose of part 4 is to give you detailed
information about the function of each command in the AT command
set.
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2. GM28 Modem
2.1 Description
The dual band GSM 850/1900MHz GM28 is a GSM/GPRS serial
modem. The modem is a powerful and flexible device that can be used
in a wide range of telemetry and telematics applications that rely on the
remote exchange of data, voice, SMS or faxes via the GSM cellular
network.
Small and lightweight, the GM28 has standard connectors and an
integral SIM card reader making it easy and quick to integrate. As well
as providing a standard RS232 serial communication interface the
GM28 also has an audio interface allowing an analogue handset to be
connected. When the GM28 is integrated into an external application, a
wireless communications system is created.
A typical end-to-end system consists of a micro controller in an external
application communicating, via the GM28 modem, with a remote
terminal or host using the GSM network. The micro controller uses a set
of AT commands to control the modem, and to set up the end-to-end
communications link, via its 9-way RS232 serial interface.
GM28 INTEGRATOR’S MANUAL
2.2 Highlights
GM28 serial modems are intended to be used by manufacturers, system
integrators, application developers and developers of a wide range of
equipment and business solutions, typically in the following fields:
• Security and alarms
• Vending
• Monitoring and control
• Utilities
• Fleet Management
• Dual band, GSM 850/1900MHz, GSM/GPRS serial modem
• Flexible plug-and-play device
• Data: GPRS, HSCSD, CSD, SMS
• Voice: full rate, enhanced full rate, half rate
• SMS: mobile-originated, mobile-terminated, cell broadcast
• Fax: Group 3, Classes 1 & 2
• RS232 9-way serial interface
• 5V - 32V d.c. input
14
• 4-wire audio connection
• Antenna connection (FME male)
• FCC and PTCRB approved
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2. GM28 MODEM
2.3 GM28 in a Communication System
Figure 2.1 illustrates the main blocks of a wireless communication
system using the GM28. It also shows the communication principles of
the system. The definitions in the figure, as used elsewhere in this
manual, are in accordance with the recommendations of GSM 07.07.
• The MS (mobile station) represents the GM28 modem plus SIM
card. The modem excluding SIM card, is known as the ME (mobile
equipment).
• The TE (terminal equipment) is a micro-controller (i.e., a computer)
and is a part of the application.
Wireless Communication System
Application
GSM Network
TE
(DTE)
ME status, responses
AT commands to control MS
MS
(GM28)
Figure 2.1 Main Blocks in a Wireless System
In accordance with the recommendations of ITU-T (International
Telecommunication Union - Telecommunications Standardisation
Sector) V.24, the TE communicates with the MS over a serial interface.
The functions of the GM28 follow the recommendations provided by
ETSI (European Telecommunications Standards Institute) and ITU-T.
ETSI specifies a set of AT commands for controlling the GSM element
of the modem; these commands are supplemented by Sony Ericsson
specific commands.
To find out how to work with AT commands, see “Part 3: Using AT
Commands”, page 49.
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GM28 INTEGRATOR’S MANUAL
Figure 2.2 illustrates the interface between the modem and the
application. The entire System Connector Interface is described in
detail in “Electrical Description”, page 28.
Power
and signals
Audio
Serial data
TE
(Application)
RJ11
RJ9
DB9
MS
(GM28)
Antenna
connector
Figure 2.2 The Interface between the modem and the Application
Note! ITU-T standards define TE and TA as DTE (Data Terminal Equipment)
and DCE (Data Circuit Terminating Equipment) respectively.
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2. GM28 MODEM
2.4 Main Features and Services
The modem performs a set of telecom services (TS) according to GSM
standard phase 2+, ETSI and ITU-T. The services and functions of the
modem are implemented by issuing AT commands over the RS232
serial interface.
2.4.1 Types of Mobile Station
The GM28 is a dual band serial modem with the GSM radio
characteristics shown in the table below.
GM28 GSM850 GSM1900
Frequency Range (MHz) TX: 824-849
Channel spacing 200 kHz 200kHz
Number of channels
Modulation GMSK GMSK
TX Phase Accuracy < 5º RMS phase error (burst) < 5º RMS phase error (burst)
Duplex spacing 45MHz 80MHz
Receiver sensitivity at
antenna connector
Transmitter output power
at antenna connector
Automatic hand-over between GSM850 and GSM1900
2.4.2 Short Message Service
The modem supports the following SMS services:
• Sending; MO (mobile-originated) with both PDU (protocol data
unit) and text mode supported.
RX: 869-894
123 carriers *8 (TDMA)
GSM: channels 128 to 251
< –102dBm < –102dBm
Class 5
0.8W (29dBm)
TX: 1850-1910
RX: 1930-1990
298 carriers *8 (TDMA)
PCS: channels 512 to 810
Class 1
1W (30dBm)
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• Receiving; MT (mobile-terminated) with both PDU and text mode
supported.
• CBM (cell broadcast message); a service in which a message is sent
to all subscribers located in one or more specific cells in the GSM
network (for example, traffic reports). This feature is network
dependent.
• SMS STATUS REPORT according to GSM 03.40.
• SMS COMMAND according to GSM 03.40.
The maximum length of an SMS message is 160 characters when using
7-bit encoding. For 8-bit data, the maximum length is 140 characters.
The modem supports up to 6 concatenated messages to extend this
function.
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2.4.3 Voice Calls
2.4.4 Data
GM28 INTEGRATOR’S MANUAL
The GM28 offers the capability of mobile originated and mobile
terminated voice calls, as well as supporting emergency calls.
Multi-party, call waiting and call deflection features are available.
Some of these features are network-operator specific.
For the inter-connection of audio, the modem offers a balanced 4-wire
analogue interface.
DTMF (Dual Tone Multi Frequency) is supported.
The modem supports the following data protocols:
• GPRS (General Packet Radio Service).
Modems are Class B terminals, which provide simultaneous
activation and attachment of GPRS and GSM services. GM28
modems are GPRS class 8 (4+1) enabled devices, which are capable
of transmitting in one timeslot per frame (up link), and receiving at a
maximum of four timeslots per frame (down link).
• CSD (Circuit Switched Data).
GM28 modems are capable of establishing a CSD communication at
9.6kbps.
• HSCSD (High Speed Circuit Switched Data).
GM28 supports HSCSD class 2 (2+1) communication, with one
timeslot per frame capacity in the up link and two timeslots per
frame capacity in the down link.
2.4.5 Fax
The GM28 allows fax transmissions to be sent and received by
commercial software installed on the application computer. Group 3 fax
Classes 1 and 2 are supported.
2.4.6 Supplementary Services
• Call forwarding
• Call hold, waiting and multiparty
• Calling/called number identification
• Advice of charge
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•USSD
• Alternate line service
• Customer service profile
• Preferred networks
• Operator selection
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• Network registration
• Call barring
• Call transfer
2.4.7 Serial Communication
The GM28 enables an end-to-end communication path to be established
between the external telemetry/telematics application and a remote
terminal or host, via the GSM network. Once a path has been set up,
voice or data communication can take place. Serial data with flow
control according to the RS232 signalling protocol operates between the
modem and the external application.
Control of the GM28 is by the external application, via the RS232 serial
interface, using a set of AT commands. The GM28 supports the full set
of AT commands according to GSM 07.05 and GSM 07.07. It also
supports an extended set of Ericsson proprietary AT commands to add
extra functionality.
2. GM28 MODEM
AT commands are used to operate the modem and have a broad range
of functions including:
• configuring general parameters of the GM28;
• setting up and controlling communications to and from the GSM
network;
• configuring the modem to communicate across the RS232 serial
interface;
• and obtaining GSM network status information.
For more detail on the AT commands supported by the GM28 see
“Alphabetical Listing of AT Commands”, page 259.
2.4.8 Interfacing with the GM28
The GM28 uses the following industry standard connectors to interface
with the external application and the GSM network;
• RJ11 (plug-in power supply connector)
• RJ9 (handset audio connector)
• Integral SIM card reader
• FME male (antenna connector)
• Sub-D socket, 9 pin (RS232 serial port)
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2.5 Service and Support
To contact customer support please use the details below:
Customer Support
Sony Ericsson Mobile Communications
Maplewood Building
Chineham Business Park
Basingstoke
RG24 8YB
E-mail: modules.support@sonyericsson.com
or
modules.info@sonyericsson.com
Information about Sony Ericsson and its products is available on the
following web site:
http://www.sonyericsson.com/M2M
GM28 INTEGRATOR’S MANUAL
2.6 Precautions
The GM28 as a stand alone item is designed for indoor use only. To use
outside it must be integrated into a weatherproof enclosure. Do not
exceed the environmental and electrical limits as specified in
“Technical Data”, page 44.
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3. Abbreviations
Abbreviation Explanations
AMR Adaptive Multi Rate
CBM Cell Broadcast Message
CBS Cell Broadcast Service
CSD Circuit Switched Data
DCE Data Circuit Terminating Equipment
DTE Data Terminal Equipment
DTMF Dual Tone Multi Frequency
EFR Enhanced Full Rate
EMC Electro-Magnetic Compatibility
3. ABBREVIATIONS
E-OTD Enhanced Observed Time Difference
ESD Electrostatic Discharge
ETSI European Telecommunication Standards Institute
FCC Federal Communications Commission
FR Full Rate
GPRS General Packet Radio Service
GSM Global System for Mobile Communication
HR Half Rate
HSCSD High Speed Circuit Switched Data
ITU-T International Telecommunication Union - Telecommunications
ME Mobile Equipment
MO Mobile Originated
MS Mobile Station
MT Mobile Terminated
PDU Protocol Data Unit
Standardisation Sector
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PTCRB PCS Type Certification Review Board
RF Radio Frequency
RLP Radio Link Protocol
RTC Real Time Clock
SIM Subscriber Identity Module
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GM28 INTEGRATOR’S MANUAL
Abbreviation Explanations
SMS Short Message Service
TA Terminal Adapter
TE Terminal Equipment
TS Telecom Services
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Part 2: Integrating the
Modem
Product Photo/Illustration
1. Mechanical Description
1.1 Overview
The pictures below show the mechanical design of the GM28 along
with the positions of the different connectors and mounting holes. The
GM28 case is made of durable PC/ABS plastic.
Antenna
connector
R 232 connectorS
LED
Access to
SIM card
Figure 1.1 GM28 viewed from the left side
Mounting hole (x2)
Power
Audio
connector
connector
Figure 1.2 GM28 viewed from the right side
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GM28 INTEGRATOR’S MANUAL
Please note the following:
• Mounting holes positioned at two of the corners make it possible to
securely bolt the modem into your application.
• Keypad, display, microphone, speaker and battery are not part of the
modem.
• The SIM card is mounted in the modem.
• The pins and electrical characteristics or the modem’s various
connectors are described in
“2. Electrical Description”, page 28.
• Information about the antenna connector is found in
“2.3 Antenna Connector”, page 31.
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1.2 Physical Dimensions
1. MECHANICAL DESCRIPTION
3.5
51.0
11.0
(x2)
55.3
71.5
10.6
45.3
66.4
9.0
26.2
11.0
77.4
Measurements are given in millimetres. See also “Technical Data”,
page 44.
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GM28 INTEGRATOR’S MANUAL
2. Electrical Description
All electrical connections to the GM28 are designed to meet the
standard air (4kV) and contact (8kV) discharge ESD tests, of
EN 301 489-1.
The modem uses the following industry standard connectors:
• RJ11 6-way (power connector)
• RJ9 4-way (handset connector)
• SIM card reader
• FME male coaxial jack (antenna connector)
• Sub-D socket, 9 pin (RS232 serial port)
2.1 Power Connector
An RJ11 6-way connector, as shown and described below, serves as a
means of supplying and controlling d.c. power to the modem.
The supply voltage, VCC, required by the modem is in the range 5V 32V d.c. Application of the supply voltage does not switch the modem
on. To do so an additional active-high control signal, TO_IN, must be
applied for > 0.2s.
A second active-high control signal, HR_IN, can be used to switch the
modem off when applied for 1 - 2 seconds, or can be used to perform a
hardware reset when applied for > 3.5s.
TO_IN and HR_IN are referenced to GND (pin 6 on the connector).
VCC and GND are reverse polarity and overvoltage protected.
654321
28
1 VCC
2 n/c
3 HR_IN
4 TO_IN
5 n/c
6 GND
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2. ELECTRICAL DESCRIPTION
The power connector electrical characteristics are listed below:
Pin Signal Dir Limits Description
1 VCC I 5 - 32V Positive power input
2- - - No connection
3 HR_IN I –0.5 - 32 V Active high control line used to switch
4 TO_IN I –0.5 - 32V Active high control line used to switch
5 - - - No connection
6 GND I - Negative power (ground) input and
2.2 Audio Connector
A 4-way RJ9 connector, as shown below, allows a telephone handset to
be plugged into the modem, giving access to the microphone and
earpiece signals. The connector may also be used to drive other
analogue audio sub-systems or devices.
Although the GM28 is pre-configured to work with a range of handsets,
the audio interface is flexible and its performance can be configured,
using AT commands, to match a particular handset or audio subsystem.
off or reset the modem
VIH > 5V, VIL < 2V
Power off: 1s < t < 2s
Hard reset: t > 3.5 s
on the modem
V
> 5V, VIL < 2V
IH
Power on: t > 0.2s
return path for TO_IN and HR_IN
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4321
1 MICN
2 BEARN
3 BEARP
4 MICP
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GM28 INTEGRATOR’S MANUAL
Audio signal descriptions are listed below:
Pin Signal Dir Description
1 MICN I Microphone negative input
2 BEARN O Earpiece negative output
3 BEARP O Earpiece positive output
4 MICP I Microphone positive input
MICP and MICN are balanced differential microphone input signals.
These inputs are compatible with an electret microphone.
BEARP and BEARN are the speaker output signals. These are
differential-mode outputs. The electrical characteristics are given in the
table below.
Parameter Limit
Output level (differential) t4.0V
Output level (dynamic load = 32:) t2.8V
Distortion at 1kHz and maximum output level d5%
Offset, BEARP to BEARN ±30mV
Ear-piece mute-switch attenuation t40dB
pp
pp
The following table shows the ear piece impedances that can be
connected to BEARP and BEARN.
Ear piece model Impedance Tolerance
Dynamic ear piece [32:+ 800µH] // 100pF ±20%
Dynamic ear piece [150:+ 800µH] // 100pF ±20%
Piezo ear piece 1k:+ 60nF ±20%
Note! Compliance with AMR may be required by certain network operators.
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