Multitech SocketModem GSM Installation instructions

SocketModem®GSM
MTSMC-G1
Hardware Guide for Developers

Copyright and Technical Support
Multi-Tech Systems, Inc. SocketModem GSM Hardware Guide for Developers 2
Hardware Guide for Developers
SocketModem®GSM – MTSMC-G1
Copyright
This publication may not be reproduced, in whole or in part, without prior expressed written permission from Multi-
Tech Systems, Inc. All rights reserved.
Copyright © 2008 by Multi-Tech Systems, Inc.
Multi-Tech Systems, Inc. makes no representations or warranties with respect to the contents hereof and specifically
disclaim any implied warranties of merchantability or fitness for any particular purpose. Furthermore, Multi-Tech
Systems, Inc. reserves the right to revise this publication and to make changes from time to time in the content hereof
without obligation of Multi-Tech Systems, Inc. to notify any person or organization of such revisions or changes. See
the Multi-Tech Web site for current revisions of documentation.
Trademarks
Trademarks and Registered Trademarks of Multi-Tech Systems, Inc. are SocketModem and the Multi-Tech logo.
Record of Revisions
Revision Date Description
A 03/14/08 Initial release.
B 08/21/08 Updated the FCC statement on page 13.
World Headquarters
Multi-Tech Systems, Inc.
2205 Woodale Drive
Mounds View, Minnesota 55112
Phone: [phone] or 800-328-9717
Fax: [phone]
Internet Address: http://www.multitech.com
Technical Support
Country By Email By Phone
Europe, Middle East, Africa: [email protected] +(44) 118 959 7774
U.S., Canada, all others: [email protected] 800-972-2439 or 763-717-5863

Table of Contents
Multi-Tech Systems, Inc. SocketModem GSM Hardware Guide for Developers 3
Table of Contents
Chapter 1 – SocketModem GSM................................................................................................................4
Introduction...........................................................................................................................................4
Product Features..................................................................................................................................4
Product Ordering Information.............................................................................................................4
Technical Specifications......................................................................................................................5
Mechanical Dimensions.......................................................................................................................6
SocketModem Configuration...............................................................................................................7
Serial Configuration..........................................................................................................................7
Electrical Characteristics and Power Consumption.........................................................................9
Electrical Characteristics..................................................................................................................9
Power Consumption.........................................................................................................................9
LED Indicators ....................................................................................................................................10
RF Interface.........................................................................................................................................10
Upgrading Firmware...........................................................................................................................11
Chapter 2 – The Antenna System............................................................................................................12
Antenna System for Embedded GSM Modems...............................................................................12
RF Specifications................................................................................................................................12
Chapter 3 – Design Considerations ........................................................................................................14
Noise Suppression Design Considerations.....................................................................................14
PC Board Layout Guidelines.............................................................................................................14
Electromagnetic Interference (EMI) Considerations.......................................................................15
Electrostatic Discharge Control........................................................................................................15
Chapter 4 – Safety and Regulatory Compliance....................................................................................16
Safety Notices and Warnings............................................................................................................16
Telecom Safety Warning................................................................................................................16
Wireless Safety..............................................................................................................................16
Certifications, Approvals, Compliance, and Requirements...........................................................18
Wireless Approvals ........................................................................................................................18
Regulatory Compliance Statements ..............................................................................................19
Waste Electrical and Electronic Equipment Statement..................................................................20
Restriction of the Use of Hazardous Substances (RoHS).............................................................21
Information on HS/TS Substances According to Chinese Standards............................................22
Information on HS/TS Substances According to Chinese Standards (in Chinese).......................23
Chapter 5 – The SocketModem Developer Board..................................................................................24
SocketModem Developer Board Block Diagram ...........................................................................24
The Developer Board Components ..................................................................................................25
Board Components........................................................................................................................26
Pins and Corresponding Signals....................................................................................................26
Table of Switch Blocks...................................................................................................................27
Developer Board Schematics ........................................................................................................28
Chapter 6 – Multi-Tech Warranty Statement ..........................................................................................32
The Multi-Tech Systems, Inc. Warranty Policy................................................................................32
Index...........................................................................................................................................................34

Chapter 1 – SocketModem GSM
Multi-Tech Systems, Inc. SocketModem GSM Hardware Guide for Developers 4
Chapter 1 – SocketModem GSM
Introduction
The SocketModem®GSM wireless modem is a complete, ready-to-integrate communications device that
offers standards-based multi-band GSM/GPRS Class 10 performance. It is based on industry-standard
open interfaces and utilizes Multi-Tech’s universal socket design. This SocketModem includes an
embedded TCP/IP protocol stack to bring embedded Internet connectivity to any device.
Product Features
•Embedded TCP/IP stack with UDP and PING support
•Short Message Services (SMS) Features:
•Text and PDU, Point-to-Point, Cell broadcast
•AT command compatible
•Advanced management features include phone book management, fixed dialing number, real
time clock, and alarm management
•Large Memory SIM support to store/recall more than 127 text messages (SMS)
•Large Memory SIM support to store/recall more than 127 entries per phonebook
•Symstream multi-dimensional symbolic communication protocol
•Link Status (LS) LED and Signal Strength Indicator (SSI) LED on-board
Product Ordering Information
Product Description Region
MTSMC-G1 Quad-band GSM/GPRS SocketModem (850/1900 MHz Default) Global
MTSMC-G1-ED Quad-band GSM/GPRS SocketModem (900/1800 MHz Default) Global
MTSMC-G1-SS Quad-band GSM/GPRS SocketModem - Symstream Enabled
(850/1900 MHz Default) Global
MTSMC-G1-ED-SS Quad-band GSM/GPRS SocketModem - Symstream Enabled
(900/1800 MHz Default) Global
MTSMC-G1-XP-SS Quad-band GSM/GPRS SocketModem - Symstream Enabled -
External Power (850/1900 MHz Default) Global
MTSMC-G1-XP-ED-SS Quad-band GSM/GPRS SocketModem - Symstream Enabled -
External Power (900/1800 MHz Default) Global
How to Read the Table Above
Build Description
-G1 GSM/GPRS
-ED Euro Default, 900/1800 MHz
-SS Symstream Enabled
-XP External Power Source

Chapter 1 – SocketModem GSM
Multi-Tech Systems, Inc. SocketModem GSM Hardware Guide for Developers 5
Technical Specifications
The SocketModem GSM meets the following specifications:
Category Description
Standards GPRS Class 10
Bandwidth Quad-band 850/1900 or 900/1800 MHz GSM/GPRS
Serial/Data Speed Serial interface supports DTE speeds to 921600 baud
Packet data up to 85.6K bps
Circuit-switched data (GPRS) up to 14.4K bps transparent and non-transparent
Data Format Asynchronous, transparent and non-transparent
Data Error Correction MNP2
Data Compression V.42bis
Fax Compatibility GSM
Fax Class Class 1 and Class 2 Group 3
Dimensions 2.541” L × 1.045” W × 0.542” H (6.45cm x 2.65cm x 1.38cm) with SIM retracted
2.974” L × 1.045” W × 0.542” H (7.55cm x 2.65cm x 1.38cm) with SIM ejected
Weight To be determined
Operating
Temperature -30° to +70° C (FCC certified operating temperature range is -30° to +50° C )
Storage Temperature -40° to +85° C
Humidity 20% to 90% (non-condensing)
Operating Voltage 5VDC
Power Requirements 5V: Typical: To be determined (minimum 400mA)
Maximum Peak Current 2.0A
(Note: The VCC supply does not have to provide a constant high current
but must accommodate the short current spikes of about 1154µs every
4.651ms.)
Connectors Antenna: UFL button-type with maximum cable length of TBD” (TBD cm)
SIM: Standard 1.8V and 3V SIM receptacle
VCC/GND: Extra connector for retrofit situations in case VCC pin is not provided
with enough current (must be same 5V source as VCC pin) and cable length must
not cause more than TBD volts drop.
IP Protocols
Supported FTP client, ICMP, POP3 (receive mail), HTTP, SMTP (send mail), TCP/UDP
socket: To be determined at a later date.
Approvals Safety Certifications
UL 60950
cUL 60950
EN 60950
AS/NZS 60950:2000
EMC Approvals
FCC Part 22, 24
ETSI EN 301 489-7
Network
PTCRB
Warranty Two years

Chapter 1 – SocketModem GSM
Multi-Tech Systems, Inc. SocketModem GSM Hardware Guide for Developers 6
Mechanical Dimensions
SocketModem GSM Mechanical Drawing

Chapter 1 – SocketModem GSM
Multi-Tech Systems, Inc. SocketModem GSM Hardware Guide for Developers 7
SocketModem Configuration
Serial Configuration
Note: The bolded, shaded pins are the SocketModem GSM active pins.
Top View
SocketModem Pinout

Chapter 1 – SocketModem GSM
Multi-Tech Systems, Inc. SocketModem GSM Hardware Guide for Developers 8
Pinout Descriptions
Pin Signal In/Out Description
24 -Reset I Device Reset (with pull-up). The active low -RESET input resets the device logic
and returns the configuration of the device to the original factory default values or
"stored values" in the NVRAM. -RESET is tied to VCC through a time-constant
circuit for "Power-on-Reset" functionality. The module is ready to accept commands
after about 6 seconds after power-on or reset.
This signal is used to force a reset procedure by providing low level during reset of
at least 500µs. The signal is considered an emergency reset only. A reset
procedure is already driven by internal hardware during the power-up sequence. If
no external reset is necessary, this input can be left open. If used (emergency
reset), it has to be driven by an open collector or an open drain.
26 GND I Logic Ground.
33 -RTS I Request to Sent (Active Low). -RTS signal is used for hardware flow control. -RTS
input ON (low) indicates that the DTE is ready to send data to the modem. In the
command state, the modem ignores -RTS.
Note: When the -RTS pin is not in use, it should be tied low.
34 -RXD O Received Data. The module uses the RXD line to send data to the DTE and to
send module responses to the DTE. In command mode, -RXD data presents the
module responses to the DTE. Module responses take priority over incoming data
when the two signals are in competition for -RXD. When no data is transmitted, the
signal is held in mark condition.
35 -TXD I Transmitted Data. The DTE uses the -TXD line to send data to the module for
transmission or to transmit commands to the module. The DTE holds this circuit in
mark state when no data is being transmitted or during intervals between
characters.
36 -RI O RING (Active Low). Incoming ring signal from phone.
Ring Indicate. -RI output ON (low) indicates the presence of an ON segment of a
ring signal on the telephone line. The modem will not go off-hook when -RI is active;
the modem waits for -RI to go inactive before going off-hook.
37 -DSR O Data Set Ready (Active Low). -DSR indicates module status to the DTE. -DSR
OFF (high) indicates that the DTE is to disregard all signals appearing on the
interchange circuits except Ring Indicator (-RI). It reflects the status of the local data
set and does not indicate an actual link with any remote data equipment.
38 -CTS O Clear to Send (Active Low). -CTS is controlled by the module to indicate whether
or not the module is ready to transmit data. -CTS ON indicates to the DTE that
signals on TXD will be transmitted. -CTS OFF indicates to the DTE that it should not
transfer data on TXD.
39 -DCD O Data Carrier Detect (Active Low). -DCD output is ON (low) when a data
connection is established and the module is ready to send/receive data.
40 -DTR I Data Terminal Ready (Active Low). The -DTR input is turned ON (low) when the
DTE is ready to communicate. -DTR ON prepares the modem to be connected, and,
once connected, maintains the connection. -DTR OFF places the modem in the
disconnect state under control of the &Dn and &Qn commands.
Note: When the -DTR pin is not in use, it should be tied low.
41 GND I Logic Ground.
61 VCC I DC Input Power. 5V DC power.
63 GND I Analog Ground. Analog ground is tied common with DGND on the SocketModem.
To minimize potential ground noise issues, connect audio circuit return to AGND.

Chapter 1 – SocketModem GSM
Multi-Tech Systems, Inc. SocketModem GSM Hardware Guide for Developers 9
Electrical Characteristics and Power
Consumption
Note: These are preliminary measurements.
Electrical Characteristics
5V DC Characteristics (VDD = 5V ± 0.25V) VDDMAX = 5.25V
Digital Inputs
–DTR (40), –TXD (35), –RTS (33) Input High Min 2.0V Input Low Max 0.8V
–RESET Input High
Min 2.0V Input Low Max 0.5V
Digital Outputs
–DCD (39), –CTS (38), –DSR (37), –RI (36), –RXD (34) Output High Min 4V Output Low Max 0.4V Current Drive: 2mA
Digital Input Capacitance 5 pF
Power Consumption
Power Consumption in EGSM900 and GSM850 @ 25 degrees C
Conditions INOM IMAX
+5V During TX bursts @ 2W 1.2 A 1.3 A
+5V Average @ 2W 250mA 320mA
+5V Average @ 0.5W 180mA 200mA
+5V Average idle mode 15mA 25mA
Power Consumption in GSM1800 & 1900 MHz @ 25 degrees C
Conditions INOM IMAX
+5V During TX bursts @1W 1.1 A 1.2 A
+5V Average @1W 210mA 235mA
+5V Average @ 0.25W 165mA 185mA
+5V Average idle mode 15mA 25mA
Power Consumption in EGSM/GPRS 900 MHz and GSM/GRPS 850 MHz Mode Class 10
Conditions INOM IMAX
+5V During TX bursts @ 2W 1.2 A 1.3 A
+5V Average @ 2W 420mA 470mA
+5V Average @ 0.5W 280mA 320mA
+5V Average idle mode 15mA 25mA
Power Consumption in GSM/GRPS 1800 MHz and GSM/GRPS 1900 MHz Class 10
Conditions INOM IMAX
+5V During TX bursts @ 1W 1.1 A peak 1.2 A peak
+5V Average @ 1W 350mA 400mA
+5V Average @ 0.25W 180mA 210mA
+5V Average idle mode 15mA 25mA

Chapter 1 – SocketModem GSM
Multi-Tech Systems, Inc. SocketModem GSM Hardware Guide for Developers 10
LED Indicators
The LEDs are used to indicate the working mode of the SocketModem. The LS LED indicates
Network Link Status and Network Strength
Network – defined by WMP100
Signal What Is Indicated
Off Processor Off
On Processor On – Not registered on the network
Slow Flash (on 200ms, off 2s) Registered on network
Quick flash (on 200ms, off 600ms) Registered on the network – Communication in
progress
Very quick flash (on 100ms, off 200ms) Bad software; software is bad or not compatible
Signal Strength
Signal What Is Indicated
Off Processor off or modem not registered on network
On Good GSM signal (RSSI >= 12)
Quick flash (on 200ms, off 600ms) Weak GSM signal (7 <= RSSI < 12)
Very quick flash (on 100ms, off 200ms) Very weak or no GSM signal (RSSI < 7)
RF Interface
Radio Characteristics
GSM 850 EGSM 900 GSM 1800 GSM 1900
Frequency RX 869 to 894 MHz 925 to 960 MHz 1805 to 1880 MHz 1930 to 1990 MHz
Frequency TX 824 to 849 MHz 880 to 915 MHz 1710 to 1785 MHz 1850 to 1910 MHz
RF Power
Stand 2W at 12.5% duty cycle 2W at 12.5% duty cycle 1W at 12.5% duty cycle 1W at 12.5% duty cycle
Impedance 50 ohms
VSWR <2
Typical Radiated Gain 0 dBi on azimuth plane
RF Performances
RF performances are compliant with the ETSI recommendation 05.05 and 11.10.
The main parameters are:
Receiver Features
•EGSM Sensitivity : < -104 dBm
•GSM 1800/GSM 1900 Sensitivity : < -102 dBm
•Selectivity @ 200 kHz : > +9 dBc
•Selectivity @ 400 kHz : > +41 dBc
•Dynamic range : 62 dB
•Intermodulation : > -43 dBm
•Co-channel rejection : + 9 dBc
Transmitter Features
•Maximum output power (EGSM) : 33 dBm ± 2 dB
•Maximum output power (DCS/PCS) : 30 dBm ± 2 dB
•Minimum output power (EGSM): 5 dBm ± 5 dB
•Minimum output power (DCS/PCS): 0 dBm ± 5 dB
•H2 level : < -30 dBm
•H3 level : < -30 dBm
•Noise in 925 - 935 MHz : < -67 dBm
•Noise in 935 - 960 MHz : < -79 dBm
•Noise in 1805 - 1880 MHz : < -71 dBm
•Phase error at peak power : < 5 ° RMS
•Frequency error : ± 0.1 ppm max
RF Connection
The RF connector on the SocketModem GSM is a UFL standard type. An antenna can be directly
connected through a mating UFL to SMA adapter.