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SMT Serial UART to GSM GPRS Module
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Introduction of Low Power GSM GPRS Modules
Low power GSM GPRS modules USR-GM3 are used for data transparent transmission. 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 Low Power GSM GPRS Modules
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
Function of Low Power GSM Modules
Structure of Low Power Gsm Modules
Features of Low Power GSM Modules
When USR-GM3 module works as TCP CLIENT, and after TCP connection is established, module will automatically send scheduled register packet to help TCP Server identify the TCP connection.
Register packet includes IMEI code, ICCID code and user-defined register data.
USR-GM3 GPRS module can send heartbeat packet to network server and serial device in network transmission mode.
GPRS module maintains the normal connection with server by keeping sending serial heartbeat packet.
Serial heartbeat packet is mainly applied to sensors which can not actively send data to server. And serial heartbeat packet can realize real-time monitoring of sensor device.
LBS base station location can get location information of USR-GM3 by mobile network.
Socket b function is suitable for such requirements as sending data to two servers, data backup and remote abnormity diagnosis.
USR-GM3 connects with FTP server to remotely upgrade user’s devices such as charging pile, instruments and remote POS machine. Only custom firmware has this function.
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
| Network | |
| 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 / HTTPD |
| Network Protocol | TCP,UDP,DNS,Http |
| Network Buffer | Send: 4K bytes, receive: 4K bytes |
| Serial | |
| 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 |
| Software | |
| 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 |
| More | |
| Warranty | 2 years |
| Accessory | null |
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User Manual
[Datasheet] USR-GM3 Datasheet | download
[User Manual] USR-GM3 Hardware Manual | download
[AT Command] USR-GM3-AT-Command-Set_V1.0.2 | download
[User Manual] USR-GM3 User Manual V1.08 | download
Development File
[PCB Library] USR-GM3 PCB Library File | download
[Demo Code] TCPIP Demo Code | download
Application Software
[USR-VCOM] USR-VCOM_V3.7.2.527_Setup | download
[USR-TCP-Test] Testing Software | download
[USR-TCP-Test_android] Testing Software | download
[USR-GM3] Setup-Software_V1.2.1.101 | download
Product Certificate
[CCC Certificate]CCC-Certificates-Wireless-Data-Terminal-2018 | download
[CE Certificates] USRIOT 2G Wireless Module CE Certificates | download
Company File
