RS232 SMS Modem







Wireless RS232 GPRS Modem


M400g wireless GPRS modem is a kind of gsm cellular modem. Iit's a industrial gprs modem works under GPRS networks.


We call it also a RS232 modem or SMS modem because it's with RS232 communication port, and for SMS applications via the software and at command.


Providing GPRS connection, the M400g wireless GPRS modem support SMS feature also, which is popular used in wireless M2M solutions.


The Global System for Mobile Communications Service is the most widely adopted, digital cellular technology in use today. GSM uses time and frequency division techniques (TDMA and FDMA) to optimize the call carrying capacity of a wireless network. GSM also provides a number of carefully standardized and broadly supported capabilities such as Short Message Service (SMS), circuit switched data (CSD) and General Packet Radio Services (GPRS). Used on the quad band GSM850/900/1800/1900Mhz

2.5G modem is from mobile communication technology (GPRS), which has become widely used of industrials and utilities in recent years and many customers are seeking reliable, flexible and cost-effective data channel to build their information system. Many applications such as ATM, POS, SCADA and surveillance system will require data channels covered all country; this brings a bright future for GPRS data networks applications.Requirements towards information system are varied because of different features of numerous industrial applications. Mobile telecom service providers are required to provide industrial application solutions not only meeting common specifications and also individual special ones.


The M400g GPRS Modem allows products to immediately offer the full benefits of GPRS technology, such as permanent online connections plus cost-efficient, high-speed data transmission. The M400g RS232 GPRS Modem can be used with a wide range of applications. Just plug & play: Accelerate development and implementation by simply plugging the M400g GPRS Modem into your products. It is backwards compatible with the M400g GPRS Modem and offers additional features.


The ultra compact quad-band M400g 2.5G Modem has all the right industry standard interfaces for GPRS Class 8 data, voice, SMS and fax applications. It can be powered by a wide range of voltages. Abuilt-in SIM card reader makes it easy to plug the M400g GPRS Modem into your application.It has full type approval according to R&TTE, GCF as well as approvals for E-marking.

Note: The accessories, AC adapter, RS232 cable and GSM antenna will be required, along with a GSM/GPRS SIM card to operate and use the unit.



RS232 GPRS Modem Industrial Application

  • 1) Remote Data Monitor and Control;

  • 2) CCTV, security surveillance;
  • 3) Water, gas and oil flow metering and schedule;
  • 4) AMR (automatic meter reading);
  • 5) Power station monitoring and control;
  • 6) Remote POS (point of sale) terminals, ATM,
  • 7) Traffic signals monitor and control, Traffic info guidance;
  • 8) Oil field, weather forecast, environmental protection, street lamp monitoring and control
  • 9) Early Warning of Mountain Torrent;
  • 10) Fleet management;
  • 11) Power distribution network supervision;
  • 12) Central heating system supervision;
  • 13) Weather station data transmission;
  • 14) Hydrologic data acquisition;
  • 15) Vending machine;
  • 16) Telemetry, SCADA;
  • 17) Vehicle logistics and diagnostics controlling;
  • 18) Parking meter and Taxi Monitor;
19) Telecom equipment supervision (Mobile base station, microwave or optical relay station)
Download - RS232 Modem GPRS
M400g GPRS Modem Quick Start

M400g GPRS Modem User Manual



For more Industrial Cellular Mobile Modems, please refer to Wireless_Modem_list



For non-industrial cellular mobile modems, please refer to



Catalog - Router Modem AP


Industrial Class Series


SOHO Class Series













Appearance - M400g GPRS Modem
GPRS Modem
GSM Phase2/2+
GSM 850/900/1800/1900Mhz
Connect to Internet , Audio, Data Transform, Fax, SMS
Supply voltage range 5 - 25VDC(9V suggest)
Class 4 (2W) for EGSM900
Class 1 (1W) for GSM1800
Dimension: 88*54*25mm
Weight: 289g
Steel shell: good electromagnetic shield and , heat radiate performance
Electromagnetic Compatible
Electrostatic Discharge (ESD): 3 class
Radiated, radio-frequency, electromagnetic field immunity test: 3 class
Storage Temperature: -40 ~ 85°C
Working Temperature: -30 ~ 75°C
Humidity: 95% (non-condensing)
Product Module Network Power Level Interface Order No.
M400gS211 Siemens MC39i 900/1800MHz DC 5V~25V RS-232 DB9  
M400gZ111 ZTE MG3006 850/900/1800/1900MHz DC 5V~25V RS-232 DB9  
M400gH111 Huawei GTM900 850/900/1800/1900MHz DC 5V~25V RS-232 DB9  
M400gO111 Simcom 300Z 900/1800/1900MHz DC 5V~25V RS-232 DB9  
M400gO211 Simcom 300C 900/1800MHz DC 5V~25V RS-232 DB9  
M400gN111 NEOWAY M580 900/1800MHz DC 5V~25V RS-232 DB9  
G283S211 Siemens MC39i 900/1800MHz DC 5V~25V RS-232 20PIN  
G283Z111 ZTE MG3006 850/900/1800/1900MHz DC 5V~25V RS-232 20PIN  
G283H111 Huawei GTM900 850/900/1800/1900MHz DC 5V~25V RS-232 20PIN