Cheap Modem GSM GPRS EDGE serial modem China OEM 2G RS232 RS485 modem














M400 Series Serial Modem


The M400 series Cellular Modem is a complete wireless data modem providing global cellular network connectivity, where cellular signal available, with 4G/3G/2G fallback capability for ensured access to the internet anywhere, providing RS232/RS485/USB port option.

The M400 is an easy to install productivity tool designed to provide maximum accessibility to the mobile professional allowing quick access to the internet for real-time business transactions, email, web browsing and more.


>>| Hot Spot for M400 Serial Modem
Broadband M2M communications
SIM failover/standby APN
2G/3G/4G failover for fixed line broadband connections
Rapid service deployment applications
Support At command
RS232/RS485/USB port option
Voice Supported (For version support voice only)
Built-in TCP/IP Stack optional


>>| Features

Easy connection, directly to the PC or laptop by using a provided extension cable


High speed with 3G+ and back compatible to HSPA data (up to 14.4Mbps downlink and 5.76Mbps uplink) and backward compatible with EDGE/ GPRS/ GSM data connectivity (up to 216~384 Kbps)

Visual feedback on connection status with the LED and the easy connection software

Compatible with nearly all modern desktop and laptop PC’s equipped with Microsoft OS (2000, XP, XP Pro and Vista)

Industrial design with intelligent software capabilities, making it a reliable cellular solution for data collection and transmission

Plug-and-play design with easy-to-use software interface for easy integration

Easily manage and control distributed remote devices over the air

Built-in Watch Dog
Real-time Clock (RTC)
Remote Data Monitor and Control

Reliable GSM/GPRS/EDGE/UMTS/HSPA or CDMA1x/CDMA2000 EVDO network connectivity, providing fast and cost-effective long-range wireless communication

Industrial design with surge protection
Local and remote configuration over the air

No need to build expensive fixed line network, saving cost substantially

The M400 series Cellular Modem sets up in minutes, making it easy to use while on-the-go.
Set up a wireless network with The M400 series Cellular Modem and provide your users with a secure, high-speed connection to the Internet virtually anywhere within a wireless broadband network.

M400 Series Serial 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)


What does it require if use a M400 series serial modem?

1. Device supports serial port (RS232/RS485);

2. A sim card supports 2G/3G network;
3. 2g/3g network signal is available in the site where the device is installed.



  • M400 Series Serial Modem includes:


    A. Distinction by network type:

    GSM version: works under GSM networks;


    GPRS version: works under GSM/GPRS networks;


    EDGE version: works under GSM/GPRS/EDGE networks;


    CDMA version: works under CDMA1x network;


    3G WCDMA HSDPA version: works under GSM/GPRS/UMTS/HSDPA networks;


    3G WCDMA HSUPA version: works under GSM/GPRS/UMTS/HSDPA/HSUPA networks;


    3G CDMA2000 EVDO version: works under CDMA1x/CDMA2000 EVDO networks;


    B. Distinction by Port Supported

    RS232 port;

    RS485 port;

    USB port;

    RJ45 port;


    Please refer the datasheet and confirm the right version before you order.



Typical Diagram for M400 Series Modem

Cheap Modem GSM GPRS EDGE serial modem China OEM 2G RS232 RS485 modem

Download - M400 Serial Modem

M400 Series Serial RS232 RS485 Modem




For more Industrial Cellular Mobile Modems, please refer to Wireless_Modem_list


For non-industrial cellular mobile modems, please refer to USB Data Modem at




Model Selection for M400 series

How to select the right version for M400 series?

Step 1) confirm the network type you will use.

Step 2) confirm your network band. (If you cannot confirm this step, get help with us)


Step 3) confirm the port you need. (RS232 or RS485, DB9 or DB15, USB port)


Step 4) confirm the option feature if you need. (Voice feature, GPS feature, Built-in TCP/IP stack)


Step 5) contact our sales with confirmation for above. Better tell us some info of your application details. Our sales will help you to select the right one



Catalog - Router Modem AP


Industrial Class Series


SOHO Class Series

Appearance - M400 Series Modem
Cheap Modem GSM GPRS EDGE serial modem China OEM 2G RS232 RS485 modem

Mobile Networks
CDMA2000 EVDO Rev 0 and Rev A


Cellular Frequency
UMTS/HSPA/HSUPA/HSPA/HSPA+ (WCDMA/FDD) 2100Mhz or 850/1900/2100 MHz or 850/900/1900/2100Mhz
Quad-band EGSM 850/900/1800/1900
CDMA1x/EVDO: 800/1900Mhz or 450Mhz optional


HSPA+: Downlink 21/42Mbps,Uplink 5.76Mbps
HSPA: Downlink 14.4Mbps, Uplink 5.76Mbps
HSUPA: Downlink 7.2Mbps, Uplink 5.76Mbps
HSDPA: Downlink 7.2 Mbps, Uplink 384k bps
WCDMA/UMTS: Downlink/Uplink 384 kbps
EDGE: Downlink 236.8 kbps, Uplink 118 kbps
GPRS: Downlink 85.6 kbps, Uplink 42.8 kbps
CDMA1x: Downlink/Uplink 153.6kbps


CDMA2000 EVDO Rev A: 3.1Mbps downlink, 2.4Mbps uplink Rev O: 2.4Mbps downlink, 153.6kbps uplink
Interface & Others
Antenna:50,SMA female interface,external replaceable
Version without GPS: 1 Unit
Version with GPS: 2 Unit


Serial port: DB9 or DB15 (RS232/RS485 optional)
Led:Power indicator, Data indicator
UIM/SIM: 1.8V/3V
SIM card slot: Yes, one unit
USB: USB 2.0 female, Mini USB
GPS: Supported (For version support GPS only)
Voice port: Supported (For version support only)


Power supply:DC6V-36V, typical DC9V1A
Power consumption: Peak 700mA@+9VDC
Average: 85mA@+9VDC
Idle: 30mA@+9VDC


OS: Windows 7, Vista, XP, 2000, Me, 98
Mac OS


At command:Support at command;
Packed with GUI software


TCP/IP Stack: Supported (For version support only)


Operating Temperature:Work temperature: -30°C to 80°C, Storage temperature: -40°C to 90°C
Humidity: 95% Maximum (Non-condensing)


Dimensions:Item (L x B x H): 83mm*53mm*25mm
Packaging (L x B x H): 260mm x 190mm x 65mm (10.3″ x 7.5″ x 2.6″)
Weight Item: 300g
Packaging: 1.6 lbs


Electromagnetic compatibility anlistatig test: Class 3
Radio electromagnetism test: Class 3


Warranty: 2 Year


Model Version Network Supported Band Interface Others
M400gsm-DB9-RS232 GSM GSM 900/1800Mhz DB9-RS232  
M400gsm-DB15-RS232 GSM GSM 900/1800Mhz DB15-RS232  
M400gsm-USB GSM GSM 900/1800Mhz USB  
M400g-DB9-RS232 GPRS GSM/GPRS 900/1800Mhz DB9-RS232  
M400g-DB9-RS485 GPRS GSM/GPRS 900/1800Mhz DB9-RS485  
M400g-DB15-RS232 GPRS GSM/GPRS 900/1800Mhz DB15-RS232  
M400g-DB15-RS485 GPRS GSM/GPRS 900/1800Mhz DB15-RS485  
M400g-DB9-RS232-t GPRS GSM/GPRS 900/1800/1900Mhz DB9-RS232  
M400g-DB9-RS232-q GPRS GSM/GPRS 850/900/1800/1900Mhz DB9-RS232  
M400g-USB-d GPRS GSM/GPRS 900/1800Mhz USB  
M400g-USB-q GPRS GSM/GPRS 850/900/1800/1900Mhz USB  
M400g-RJ45-d GPRS GSM/GPRS 900/1800Mhz RJ45  
M400g-RJ45-q GPRS GSM/GPRS 850/900/1800/1900Mhz RJ45  
M400e-DB9-RS232-d EDGE GSM/GPRS/EDGE 900/1800Mhz DB9-RS232  
M400e-DB9-RS232-q EDGE GSM/GPRS/EDGE 850/900/1800/1900Mhz DB9-RS232  
M400e-USB-d EDGE GSM/GPRS/EDGE 900/1800Mhz USB  
M400e-USB-q EDGE GSM/GPRS/EDGE 850/900/1800/1900Mhz USB  
M400c-DB9-RS232-s CDMA CDMA1x 800Mhz DB9-RS232  
M400c-DB9-RS232-d CDMA CDMA1x 800/1900Mhz DB9-RS232  
M400ev-DB9 EVDO CDMA1x/CDMA2000 EVDO 800/1900Mhz DB9-RS232, USB option Voice option
M400d-DB9 HSDPA GSM/GPRS/EDGE/WCDMA/UMTS/HSDPA 850/900/1800/1900/2100 DB9-RS232, USB option Voice option
M400d-DB9-GPS HSDPA GSM/GPRS/EDGE/WCDMA/UMTS/HSDPA 850/900/1800/1900/2100 DB9-RS232, USB option GPS, Voice option
M400u-DB9-GPS HSUPA GSM/GPRS/EDGE/WCDMA/UMTS/HSDPA/HSUPA/HSPA 850/900/1800/1900/2100 DB9-RS232, USB option Voice option