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Low Power GSM GPRS Module


SKU: GSM GPRS Modules USR-GM3 Categories: ,


GSM GPRS Modules USR-GM3 Introduction

GSM GPRS Modules USR-GM3 are low-power transparent transmission GSM GPRS modules which can realize the UART’s bidirectional transparent transmission to GPRS. USR-GM3 is highly-integrated UART to GSM/GPRS module. Users can easily make communication with it among serial device, cellphone and network device. USR-GM3 is an embedded GSM module. It is designed for embedded system, and it is so small and convenient that you can integrate it to your system easily.

Features of GSM GPRS Modules USR-GM3

  • Small and completed function GPRS DTU, transmission between serial and GPRS.
  • Support GSM850/900,DCS1800/1900.
  • Support GSM/GPRS and 2G/3G/4G card, but don’t support 3G/4G network.
  • Support 2 sockets, Support TCP and UDP.
  • 4KB cache for each of sockets, user can choose to cache data or not.
  • Support register packet and heartbeat packet.
  • Support setting parameters via SMS message.
  • Support 3 work modes: SMS transmission mode, network transmission mode and httpsD mode.
  • Support basic and extend AT command sets.
  • Support class RFC2217, can dynamically modify serial parameter of module via network.
  • Support flow control: RTS/CTS.
  • Support RS485.
  • Low Power GSM Modules.
  • Support public and APN network access.
  • Support heartbeat, Always Online mode, can keep connection with server.
  • Support KEEP-ALIVE, to maintain connection if there is no heartbeat packet.
  • Support network connection in Max 4 Channel, can send data from serial port to different servers.
  • Support SMS AT Command mode.
  • Support SMS transparent transmission, Network transparent transmission, httpsD, UDC and other working modes.

Application Field of Low Power GSM Modules

  • Agricultural IOT Environment Monitoring Solution
  • Charging Pile Data Real-time Transmission Solution
  • City Bus Real-time Data Acquisition Solution
  • Remote POS Online Payment Solution


Standard GSM / GPRS
Rate 14.4 Kbps ~ 57.6 Kbps
Standard Frequency Range 850/900/1800/1900MHz
GPRS Multi-slot Class GPRS Class 10
GPRS Terminal Device Class Class B
GPRS Coding Schemes CS1 ~ CS4
Max Launch Power GSM900 class4 (2W), DCS1800 class1 (1W)
Application GSM standard AT instruction set / USR extension AT instruction set / data transmission / SMS transmission / httpsD
Network Protocol TCP,UDP,DNS,https
Network Buffer Send: 4K bytes, receive: 4K bytes
Port Number 1
Interface Standard TTL: SMT 2.8 ~ 3.6 V
Data Bits 7,8
Stop Bit 1,2
Check Bit None,Even,Odd
Baud Rate 2400 bps ~ 921600 bps
Flow Control CTS/RTS
Buffer Send and receive 4k bytes respectively
Device Interface
SIM Card 1.8V / 3V
Speech Interface 1 channel MIC input, 1 channel SPEAK output
Virtual Serial(USR-VCOM) Windows 2000 or higher(32 bit/64 bit)
Configuration Serial AT command, sms AT command, network AT command
Basic Parameter
Size 27.9 x 24 x 3 mm
Operating Temp. -25 ~ 85°C
Storage Temp. -40 ~ 125°C, 5 ~ 95% RH(no condensation)
Input Voltage DC 3.4 ~ 4.2V, recommend: 3.8V
Working Current Average: 55 ~ 90mA; Max: 750mA


User Manual