GSM Modems

GPRS/GSM Modem is a networking transmission terminals, wireless data transmission for remote users to interact with the network operator GPRS or GSM network. After a simple setup, GPRS Modem can easily achieve transparent two-way transfer between the RS232 / RS485 / RS422 serial port and GPRS networks. USR ITO GPRS/GSM Modem supports quad-band GSM850 / 900 DCS1800 / 1900 to adapt to the global communications bands; support a variety of operating modes, namely SMS transparent transmission, network transparent transmission and HTTPD Client. Users can through its AT commands related settings.

Currently, GPRS/GSM Modem has been widely used in electricity, environmental protection, LED information dissemination, logistics, water temperature, weather and other industries. Although the application of different industries, but the principle is the same application. GPRS/GSM Modem and the industry are mostly connected to the device, such as PLC, SCM, and other automation products to connect, and then back to establish a communication connection wireless. Internet growing today, GPRS/GSM Modem used more and more widely. It provides assistance for the information, products combine the industry and among industries.


  • 1 or 2 serial port supporting RS232/RS485
  • Socket modes support TCP client/UDP Client
  • Support Serial AT Command, SMS AT Command and Netword AT Command
  • Integrated TCP/IP protocol stack
  • -40 to 85℃ operating temperature range
  • D2D and USR Clouds drivers for Windows and Linux

RS232 / RS485 GSM Modems Support GSM/GPRS

USR-GPRS232-730 is a RS232/RS485 to gprs dtu,used for data transparent transmission.

  • 1 RS232 serial port and 1 RS485 serial port (not use simultaneously)
  • Operation temperature Range of -25℃ ~85℃
  • Quad-Band GSM/GPRS 850/900/1800/1900MHz

RS485 GSM Modems, RS485 to GPRS

USR-GPRS232-734 is a RS485 to gprs modem, used for data transparent transmission.

  •  1 RS485 serial port
  • Operation temperature Range of -25° ~85°
  • Quad-Band GSM/GPRS 850/900/1800/1900MHz