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Dual Band 900 / 1800 MHz
Fax, SMS and Data
Integral SIM Card holder
Siemens TC-35i GSM Engine
Rugged Extruded Aluminium
Enclosure
Compact Form Factor
86 x 54 x 25mm
RS232 Interface with
Auto baud rate detection
SMA Antenna Connection
LED Indication of Operation
Description
The low cost TMAS GSM Modem is ideal for a wide range of applications. The modem can be used to make
circuit switched data calls, making the unit suitable for remote dial-up systems where a fixed phone line is not
available. The SMS functionality enables the sending and receipt of text messages. A common use for this
functionality is an SMS server for the automated sending and receipt of bulk text messages.
The modem implements the highly reliable Siemens TC35i GSM Engine. This ensures high quality and reliable
operation along with compatibility with all standard GSM networks. The modem provides support for the
Siemens TC35i AT command list, also available for download from the RF Solutions website.
The TMAS modem is supplied in a rugged extruded aluminium enclosure making it suitable for use in a wide
range of industrial and demanding environments. The unit connects directly to a PC or terminal device via the
DB-9 RS232 Cable interface. The integral SIM card holder accepts standard SIM cards of all network operators.
The only other connections required are to 6-40Vdc power supply and Antenna (supplied separately).
Part Numbering
Part Number
GSM-T35I
GSM20-ANT
CABLE-RS232
SIMCARD
Description
Dual Band GSM Modem
Antenna with 2.5 Metre Coax, SMA connector
RS232 Cable 9 Way D-Type Male to Female
Vodafone Pay as you talk SIM Card, £1.00 Credit, 10p/Text
DS-GSMT35I-2
Oct ’07
www.rfsolutions.co.uk
©2007
REG No 277 4001, ENGLAND.
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Table of Contents
1
2
Key Features ..................................................................................................................................................3
Interface description .......................................................................................................................................4
2.1 Power Supply..................................................................................................................................4
2.2 RS232 Interface..............................................................................................................................4
2.3 SIM Interface ..................................................................................................................................5
2.4 Radio Interface ...............................................................................................................................5
Operating Modes............................................................................................................................................6
3.1 Status LED......................................................................................................................................6
Basic Setup Information .................................................................................................................................7
4.1 Modem functionality Test................................................................................................................7
4.2 Basic AT Command List .................................................................................................................9
Mechanical Characteristics ..........................................................................................................................10
3
4
5
DS-GSMT35I-2
Oct ’07
www.rfsolutions.co.uk
©2007
REG No 277 4001, ENGLAND.
Page 2
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Key Features
Features
Transmission
Power supply
GSM class
Frequency bands
Implementation
Data, SMS, Fax
Single supply voltage
Min:
6Vdc
Max: 40Vdc
Small MS
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Internal
Connected via antenna SMA connector
MT, MO, CB, Text and PDU mode
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CSD DATA
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CSD transmission rates: 2.4, 4.8, 9.6, 14.4
kbps, nontransparent,V.110
Unstructured Supplementary Services Data
(USSD) support
Dual Band E-GSM 900 and GSM 1800
Compliant to GSM Phase 2/2+
Class 4 (2W) for EGSM900
Class 1 (1W) for GSM1800
Transmit power
SIM card reader
External antenna
SMS
FAX
Group 3: Class 1, Class 2
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RS-232 interface, bi-directional bus for AT
commands and data
Multiplex ability according to GSM 07.10
Multiplexer protocol
Baud rates from 300bps to 115,200bps
Autobauding supports: 1,200, 2,400, 4,800,
9,600, 19,200, 38,400, 57,600 and 115,200bps
Serial interface
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Supported SIM card
Phonebook management
Reset of Terminal TMAS GSM
Real time clock
Environmental Temperature:
Size
Weight
3V
Supported phonebook types: FD, LD, MC, RC, ON, ME
Reset via AT command
Implemented (clock frequency 32.768kHz)
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Normal operation: -20° to +55°
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Humidity: max. 80% relative humidity
86mmx54mmx25mm (Casing Dimension)
82g (Approx.)
DS-GSMT35I-2
Oct ’07
www.rfsolutions.co.uk
©2007
REG No 277 4001, ENGLAND.
Page 3
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Interface description
The TMAS GSM Terminal provides the following connectors for power supply, interfacing and antenna:
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2.1mm DC power connector (centre/inner pin is positive)
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9-pin (female) D-SUB plug for RS-232 serial interface
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SMA connector for antenna (radio interface)
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SIM card holder
2.1 Power Supply
The power supply of the TMAS GSM Terminal has to be a single voltage source of Vin=6V providing a peak
current of up to 500mA during transmission.
The terminal can be turned on by just plug in a 6VDC power supply. The terminal power supply circuit
automatically generates a low pulse signal not less than 100ms in order to wake up the Siemens TC35i GSM
engine.
In order for the terminal to shut down properly, wait for 10s after sending AT^SMSO before switching off the
power supply. This time is needed for the module to be safely logged off from the network and finish saving
data to the internal memory.
Each time the terminal is shut down, data will be written from the volatile memory to flash memory. The
guaranteed maximum number of write cycles is limited to 100,000.
2.2 RS232 Interface
Via RS-232 interface, the host controller controls the TMAS GSM/GPRS Terminal and transports data. The
table below shows the pin assignment of RS-232 (D-SUB 9-pin female).
Pin no.
1
2
3
4
5
6
7
8
9
Signal name
/DCD
/RXD
/TXD
/DTR
GND
/DSR
/RTS
/CTS
/RI
I/O
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O
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Function
Data Carrier Detected
Receive Data
Transmit Data
Data Terminal Ready
Ground
Data Set Ready
Request To Send
Clear To Send
Ring Indication
TMAS GSM/GPRS Terminal is designed for use as DCE. Based on the conventions for DCE-DTE connection,
it communicates with the user application (DTE) using the following signals:
DS-GSMT35I-2
Oct ’07
www.rfsolutions.co.uk
©2007
REG No 277 4001, ENGLAND.
Page 4
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Pin TxD @ application sends data to TxD of TMAS GSM/GPRS Terminal
Pin RxD @ application receives data from RxD of TMAS GSM/GPRS Terminal
The RS-232 interface is implemented as a serial asynchronous transmitter and receiver conforming to ITU-T
V.24 Interchange Circuits DCE. It is configured for 8 data bits, no parity and 1 stop bit, and can be operated at
bit rates from 300bps to 115Kbps. Autobauding supports bit rates from 4.8Kbps to 115Kbps. Hardware
handshake using the /RTS and /CTS signals and XON/XOFF software flow control are supported.
In addition, the modem control signals /DTR, /DSR, /DCD and /RING are available. The modem control signal
RING (Ring Indication) can be used to indicate to the cellular device application, that a call or Unsolicited Result
Code (URC) is received. There are different modes of operation, which can be set with AT commands.
2.3 SIM Interface
The SIM interface is intended for 3V SIM cards in accordance with GSM 11.12 Phase 2. The card holder is a 5
wire interface according to GSM 11.11. A sixth pin has been added to detect whether or not a SIM card is
inserted.
Removing and inserting the SIM card during operation requires the software to be reinitialized. Therefore, after
reinserting the SIM card it is necessary to restart the terminal.
Note:
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No guarantee can be given, nor nay liability accepted, if loss of data is encountered after removing the
SIM card during operation.
No guarantee can be given for properly initializing any SIM card that the user inserts after having
removed a SIM card during operation. In this case, the application must restart the terminal.
2.4 Radio Interface
An internal RF cable is connected from the antenna reference point (antenna connector type GSC from Murata)
to the SMA (female) connector. To attach the antenna to the TMAS GSM/GPRS Terminal, turn smoothly and
slowly to the SMA (male) connector of antenna at clockwise direction.
DS-GSMT35I-2
Oct ’07
www.rfsolutions.co.uk
©2007
REG No 277 4001, ENGLAND.
Page 5
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