RS232 Serial 3G Modem, WCDMA

RS232 Serial 3G Modem, WCDMA

Model: USR-G761W

USR-G761 is a RS232 Serial 3G Modem, can used in 3G WCDMA network, support HSDPA(7.2Mbps) high speed downlink transmission, and HSUPA(5.6Mbps) high speed uplink.
  • 1 RS232 Serial Port and 1 RS485 Serial Port
  • Operation temperature Range of -40° ~85°
  • Quad-Band GSM/GPRS 850/900/1800/1900MHz

RS232 Serial 3G Modem, WCDMA

General Details


USR-G761 is a DTU can used in 3G WCDMA network, it can worked in WCDMA/GSM, support HSDPA(7.2Mbps) high speed downlink transmission, and HSUPA(5.6Mbps) high speed uplink. The leistungskern of G761W is “transparent transmission”, user can integrate it into their system easily to realise data transfer based on WCDMA network.


  • Support quad band GSM/GPRS/EDGE and triple band WCDMA/HSPA.
  • Support 2 network connections online simultaneously, support TCP and UDP.
  • Support send network registration packet.
  • Support heartbeat packet to serial or network.
  • Support set the parameter remotely by SMS
  • Support multiple working mode: SMS transparent transmission, network transparent transmission, HTTPD mode.
  • Support send Chinese/Enlish SMS by AT command.
  • Support RFC2217 function, the parameters of interface can be revised.
  • Support RS232/RS485(can not work at the same time).

Working Mode

3G Modem

1. Network transparent transmission mode

In this mode, User’s device can send data to specified server by WCDMA network. G761 support 2 socket link, that is Socket A and Socket B, two links is mutual independence.

2. HTTPD Client Mode

In this mode, the data will sent to HTTP server directly, or obtain data from HTTP server. The data will sent to Web server(apache, IIS, tomcat, etc) in Http(GET/POST) mode as long as sending data in formal format. User can utilize the scripting language like PHP, ASP as database storage.

3. SMS transparent transmission mode

In this mode, user’s device can send SMS to specified phone, or transmit the SMS from phone to device. The transparent transmission between device and phone can realised by parameter setting.

4. AT command

When G761W working in any kind of mode(Network transparent transmission, SMS transparent transmission, AT command), user can send specified data, then let WCDMA switch into AT command mode.


Wireless Parameters  
Frequency Band GSM/GPRS/EDGE: 850/900/1800/1900MHz
WCDMA/HSPA: 850/1900/2100MHz
Receiving sensitivity <-108.7dBm
Maximum transmitted power CDMA: 33dBm±2dB
Data bandwidth Download rate: 5.76Mbps; upload rate: 7.2Mbps
Hardware Parameters  
Interface RS232: 1200bps - 460800bps
RS485: 1200bps - 460800bps
Working Voltage DC 5V~24V
Working Current average current: 200mA@12V
peak current: 230mA@12V
Operating Temp 35~80°
Storage Temp -45°~90°
Size 103 * 105 * 28mm
Software Parameters  
Working mode Transparent Transmission, AT command
Command AT command
Configuration Set-up software

How to Buy

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