GSM/GPRS modem

GSM/GPRS modem T&T GM24V

GSM/GPRS modems GM24V series are used for quick and easy integration into various systems of wireless data exchange.
T&T GM24V - double-banded device (EGSM 900/1800 MHz), supporting GPRS class 10, equiped with TCP/IP protocol stack аnd Open AT function.

Easy addition of wireless connection to Your applications
such as management and monitoring over remote objects: vending machines, transport monitoring systems and others..

Reducing of a quantity of additional component parts
Open AT platform provides users a possibility to use resources of internal modem's microcontroller and flash-memory for storage and usage of own unique applications. Transition to Open AT platform allows to refuse from an external microcontroller that controls peripheral devices.

Technical characteristics

General characteristics

Double-banded GSM/GPRS module (EGSM900/1800 MHz)
Complete correspondance to "ETSI GSM Phase 2+" standard
Class 4 (2Wt @ 850/900 MHz)
Class 1 (2Wt @ 1800/1900 MHz)
GPRS Class 10
Voltage supply: 12 - 32 V
Current consumption:
- in operation mode (GSM 900@12V)-140 mA
- in operation mode (GSM 1800/1900@12V)-100 mA
- in sleep mode - 5 mA
Dimensions: 120 х 90 х 35mm
Weight: 150g
Operation temperature -20..+55°С
Storage temperature -25..+70°С

Voice communication (GSM mode):

Telephone communication
Emergency calls
Data compression modes FR, EFR, HR
Tone dialing DTMF

Data/fax/SMS transmission in GSM network

Synchronous data transmission, "transparent" и "non-transparent" modes up to 14400 bits/s
MNP2, V42/bis standards support
Automatic trasmission of faxes of group 3 (Class 1 and Class 2
Text and protocol PDU
MT/MO connection

GPRS data transmission

GPRS class 10
PBCCH support
Coding schemes: from CS1 to CS4
Compatible with SMG31bis standard
Buit-in TCP/IP stack

Additional possibilities of GSM

Redirection of calls
Blocking of calls
Multilateral communication
Call waiting and call holding
USSD
Closed user list
Straight redirection of calls

Other possibilities

Paltform support for Open AT developer
Fixed numbers
SIM Toolkit Class 2
SIM card blocking for one network and service operator
Real time clock (RTC)
Alarm clock
Possibility to update a program using Xmodem protocol
UC32 character set

Interfaces

Serial port RS-232 suppots:
- Software controlled automatic switching-off of a serial port (using AT commands)
- Serial port data rate from 300 up to 115200 bits/s
- Serial port data rate with self-correction from 300 up to 38400 bits/s
AT commands interface
- Recommendations GSM 07.05 and 07.07
- Expanded set of AT commands
User interfaces Open AT:
- SMA antenna connector
- SIM cards holder (3 or 5V)