Shenzhen E-Lins Technology Co., Limited
Main products:3G router,3G modem,hsdpa modem,hsdpa router,GPRS router,GSM router,3G dongle,4G router,4G dongle,3G USB modem,3G wifi router
Contact Us
  • Contact Person : Ms. Ng Mary
  • Company Name : Shenzhen E-Lins Technology Co., Limited
  • Tel : 86-755-33231620
  • Fax : 86-755-83700465
  • Address : Guangdong,Shenzhen,1007A, MinTai Bld., Minkang Road, Minzhi Street, Bao'an District, ShenZhen, 518000, China
  • Country/Region : China
  • Zip : 518040

D120 Serial to Cellular Gateway

D120 Serial to Cellular Gateway
Product Detailed
Serial to Cellular Gateway; Support RS232 RS485 port; Auto dialup, always online World-wide use Sim card slot

 D120 Serial to Cellular Gateway

We short name Serial to GPRS Gateway as GPRS DTU IP Modem. And Serial to CDMA Gateway as CDMA DTU IP Modem.

D120 Series DTU modem enables various kinds of legacy devices with serial port to communicate over cellular network and the Internet easily and freely. It not only works as a cellular modem, but also can construct a smooth "cellular Data Tunnel" between Host and Remote side, ensuring an efficient communication for data transmission and remote device management.

With the selectable RS232/TTL/RS485/RS422 serial port, D120 Series DTU modem is an ideal solution for factory automation, environmental monitoring and remote device management etc. Meanwhile, it is supplied with simple Software interface that streamline application development process, freeing system integrators from dealing with complex communication protocols of GPRS/CDMA and the Internet. Users do not need to change the existing system, saving cost and time for field maintenance, and making it a perfect solution for data transmission.

The difference between DTU modem and normal modem 


DTU Modem

Normal Modem

Dial up

Support automatically dialup;

Online always; trigger to dialup, schedule to dialup

Need back platform to dialup











Same as GSM network

Same as GSM network

Transparent Data






Point to Point


Depends network

Point to Multipoint



Center to Multipoint



Dynamite IP Address Mapping







Utilities, traffic control, finance and industry supervision

Mobile Internet access for PC

DTU: Data Transmission Unit.     It is called as DTU modem by some users.

>>| Typical Topology>>| Industrial Application

l         Remote Data Monitor and Control

l         CCTV, security surveillance

l         Water, gas and oil flow metering and schedule

l         AMR (automatic meter reading)

l         Power station monitoring and control

l         Remote POS (point of sale) terminals, ATM,

l         Traffic signals monitor and control, Traffic info guidance

l         Oil field, weather forecast, environmental protection, street lamp monitoring and control

l         Early Warning of Mountain Torrent

l         Fleet management

l         Power distribution network supervision

l         Central heating system supervision

l         Weather station data transmission

l         Hydrologic data acquisition

l         Vending machine

l         Telemetry, SCADA

l         Vehicle logistics and diagnostics controlling

l         Parking meter and Taxi Monitor

l         Telecom equipment supervision (Mobile base station, microwave or optical relay station)

>>| Benefits and Features

Industrial design with intelligent software capabilities, making it a reliable GPRS solution for data collection and transmissionPlug-and-play design with easy-to-use software interface for easy integrationNo need to build expensive fixed line network, saving cost substantiallyEasily manage and control distributed remote devices over the airBuilt-in Watch DogReal-time Clock (RTC)Remote firmware upgrade over the air (OTA) Connect to any serial device to GPRS and the InternetSupport TCP,UDP, DNS,PPP,DHCP and so on.Reliable GPRS network connectivity, providing fast and cost-effective long-rangeAlways-On-Line/on DemandSleep mode supportedwake up Remotely (SMS or Voice call)Support APNIndustrial design with surge protectionLocal and remote configuration over the airMulti-destination IP support

>>| Basic Features

Embedded PPP, TCP/IP stack Transparent data conversion and transmission Supports static data service center IP address Supports DNS and dynamic data service center IP address Supports GPRS/EDGE customized APN or CDMA VPDN Supports peer to peer, center to multi-point data transmission Supports Xmodem protocol and firmware updatingOptimized EMC design Wide range power input Smart power management Power on/off control Industrial class pluggable terminal block Standard antenna and SIM interface Reliable, flexible, easy to use and management


For more datasheet and spec, contact us freely.


D120 Serial to Cellular Gateway

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