RS232/RS485 Serial GSM/GPRS/3G data converter Gateway

Serial to Cellular GatewayE-Lins H685 series router is a new published products. Built-in RS232 to GSM data converter, wifi, gps, and one LAN RJ45 port. Powerful, high performance.


With I/O terminal block, H685 series support RS232 to GPRS data convertor, RS232 to 3G Data Convertor, etc.


H685 series RS232 to Cellular gateway contains the following version:

GSM serial gateway;

GPRS serial gateway;

CDMA serial gateway;

HSDPA serial gateway;

HSUPA serial gateway;

RS232 and RS485 supported.


Main Feature of H685 Serial to Cellular Gateway

  • 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/3G customized APN or CDMA VPDN;
  • Supports peer to peer, center to multi-point data transmission;
  • Supports Xmodem protocol and firmware updating;
  • Optimized 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;


Enhanced Feature of H685 Serial to Cellular Gateway


Industrial design for different application environments:

1. Industrial class components
2. Embedded RTOS


Built-in multiple communication protocols:



Multiple operation model:

1. Always online: automatic online while it powered on, automatic redial and keep-alive while the line dropped.
2. Data trigged online
3. Ring and SMS trigged online
4. Online control interface with the connected device
5.GPRS/CDMA and SMS backup and switch
6. Data loop testing


Flexible data communication :

1. Supports TCP/IP Server/Client, UDP/IP, DDP, SMS, AT
2. Self-define transparent or protocol communication
3. Self-define last packet idle interval and MTU
4. Self-define customized data frame separator
5. Self-define re-connecting interval
6. Self-define online report interval
7. Self-define heart-beating data frame



RS232 RS485 Serial to Cellular Gateway for 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 - Serial Cellular Gateway

H685 3G Router Serial to Cellular Gateway

H685 Quick Start

H685 User Manual


For GPRS and CDMA Serial Gateway Router, please click


D120g GPRS Serial Gateway;

D120c CDMA Serial Gateway;


Catalog - Router Modem AP


Industrial Class Series


SOHO Class Series

Appearance - Serial Cellular Gateway
3g serial gateway

GSM/GPRS/EDGE: 850/900/1800/1900Mhz
UMTS/WCDMA/HSDPA/HSUPA: 850/900/1900/2100Mhz

Data Speed:
HSDPA: 7.2Mbps downlink, 384kbps uplink
HSUPA: 14.4Mbps downlink, 5.76Mbps uplink

Connect to Internet, data transmission, network always online, auto redail up
1 LAN port + RS232 port, WiFi optional;
Support RS232/RS485 to Cellular Data converter (optional feature);
GPS optional; WiFi optional
Support User-friendly Web GUI;
Firmware Upgradeable;
Traffic & Event Log;
Firewall - NAT, ALG modules, DMZ, DDNS
VPN and Tunneling (PPTP,L2TP, IPsec) optional 
Network Services include DHCP, Time, DNS
Remote Management with SNMP
Support RS232/RS485 Port
Zero-configuration UPnP support
Web based SMS client
R&TTE and GCF certified
Supply voltage range 5 - 25VDC(12V suggest)
Low power waste
Support Firmware update for better quality
Dimension: 72mm x 55mm x 23mm(without antenna)
400g (not including the antenna)
440g (including the antenna)
850g (including all accessories)
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 Network Band Power Interface VPN WiFi
H685u HSUPA/HSDPA/EDGE/GPRS/GSM 850/900/1800/1900/2100MHz DC 9V~25V LAN X 1, RS232, USB2.0 No No  
H685vu HSUPA/HSDPA/EDGE/GPRS/GSM 850/900/1800/1900/2100MHz DC 9V~25V LAN X 1, RS232, USB2.0 Yes No  
H685uvw HSUPA/HSDPA/EDGE/GPRS/GSM 850/900/1800/1900/2100MHz DC 9V~25V LAN X 1, RS232, USB2.0 Yes Yes  
H685ug HSUPA/HSDPA/EDGE/GPRS/GSM 850/900/1800/1900/2100MHz DC 9V~25V LAN X 1, RS232, USB2.0, GPS Yes No