Sony 6220502-BV User Manual

GM28

Integrator’s Manual

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
			3

LZT 123 7468 P1A

GM28 INTEGRATOR’S MANUAL

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
4

LZT 123 7468 P1A

	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
				5

LZT 123 7468 P1A

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

6

LZT 123 7468 P1A

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
			7

LZT 123 7468 P1A

GM28 INTEGRATOR’S MANUAL

	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

8

LZT 123 7468 P1A

17. Alphabetical Listing of AT Commands .............................................................

259

9

LZT 123 7468 P1A

GM28 INTEGRATOR’S MANUAL

10

LZT 123 7468 P1A

Part 1: Overview

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.

1.3Manual 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.

13

LZT 123 7468 P1A

GM28 INTEGRATOR’S MANUAL

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 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

2.2 Highlights

•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

•4-wire audio connection

•Antenna connection (FME male)

•FCC and PTCRB approved

14

LZT 123 7468 P1A

2.GM28 MODEM

2.3GM28 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

GSM Network

Application

		ME status, responses
TE				MS
(DTE)		AT commands to control 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.

15

LZT 123 7468 P1A

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
	RJ11
	Audio	MS	Antenna
	RJ9
	Serial data	(GM28)	connector
TE	DB9
(Application)

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.

16

LZT 123 7468 P1A

2.GM28 MODEM

2.4Main 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	TX: 1850-1910
		RX: 869-894	RX: 1930-1990
	Channel spacing	200kHz	200kHz
	Number of channels	123 carriers *8 (TDMA)	298 carriers *8 (TDMA)
		GSM: channels 128 to 251	PCS: channels 512 to 810
	Modulation	GMSK	GMSK
	TX Phase Accuracy	< 5º RMS phase error (burst)	< 5º RMS phase error (burst)
	Duplex spacing	45MHz	80MHz
	Receiver sensitivity at	< –102dBm	< –102dBm
	antenna connector
	Transmitter output power	Class 5	Class 1
	at antenna connector	0.8W (29dBm)	1W (30dBm)

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.

•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.

17

LZT 123 7468 P1A

GM28 INTEGRATOR’S MANUAL

2.4.3 Voice Calls

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.

2.4.4 Data

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.

2.4.6Supplementary Services

•Call forwarding

•Call hold, waiting and multiparty

•Calling/called number identification

•Advice of charge

•USSD

•Alternate line service

•Customer service profile

•Preferred networks

•Operator selection

18

LZT 123 7468 P1A

2.GM28 MODEM

•Network registration

•Call barring

•Call transfer

2.4.7Serial 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.

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)

19

LZT 123 7468 P1A

GM28 INTEGRATOR’S MANUAL

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: [e-mail] or

[e-mail]

Information about Sony Ericsson and its products is available on the following web site:

http://www.sonyericsson.com/M2M

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.

20

LZT 123 7468 P1A

3. ABBREVIATIONS

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
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
	Standardisation Sector
ME	Mobile Equipment
MO	Mobile Originated
MS	Mobile Station
MT	Mobile Terminated
PDU	Protocol Data Unit
PTCRB	PCS Type Certification Review Board
RF	Radio Frequency
RLP	Radio Link Protocol
RTC	Real Time Clock
SIM	Subscriber Identity Module

21

LZT 123 7468 P1A

GM28 INTEGRATOR’S MANUAL

Abbreviation	Explanations
SMS	Short Message Service
TA	Terminal Adapter
TE	Terminal Equipment
TS	Telecom Services

22

LZT 123 7468 P1A

Part 2: Integrating the

Modem

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.

LED

Antenna

connector Access to

SIM card

RS232 connector

Figure 1.1 GM28 viewed from the left side

Mounting hole (x2)

Power

connector

Audio connector

Figure 1.2 GM28 viewed from the right side

25

LZT 123 7468 P1A

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.

26

LZT 123 7468 P1A

1. MECHANICAL DESCRIPTION

1.2 Physical Dimensions

3. 5

(x2)

71. 5

51.0

11.0

55.3

26.2

9.0

11.0

77.4

45.3

66.4

10.6

Measurements are given in millimetres. See also “Technical Data”, page 44.

27

LZT 123 7468 P1A

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)

2.1Power 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.

6

5

4

3

2

1

1	VCC	3	HR_IN	5	n/c
2	n/c	4	TO_IN	6	GND

28

LZT 123 7468 P1A

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 - 32V	Active high control line used to switch
				off or reset the modem
				VIH > 5V, VIL < 2V
				Power off: 1s < t < 2s
				Hard reset: t > 3.5s
4	TO_IN	I	–0.5 - 32V	Active high control line used to switch
				on the modem
				VIH > 5V, VIL < 2V
				Power on: t > 0.2s
5	-	-	-	No connection
6	GND	I	-	Negative power (ground) input and
				return path for TO_IN and HR_IN

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.

4

3

2

1

1	MICN	3	BEARP
2	BEARN	4	MICP

29

LZT 123 7468 P1A

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)	t4.0Vpp
Output level (dynamic load = 32:)	t2.8Vpp
Distortion at 1kHz and maximum output level	d5%
Offset, BEARP to BEARN	±30mV
Ear-piece mute-switch attenuation	t40dB

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.

30

LZT 123 7468 P1A