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Product Name：GSM GPRS Modules

Model：USR-GM3

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

Function of Low Power Gsm Modules which used for data transparent transmission.

Structure of Low Power Gsm Modules

Features of Low Power GSM Modules

Unique Features of Low Power Gsm Modules

Unique Features of Low Power Gsm Modules, register packet

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.

Unique Features of Low Power Gsm Modules, heartbeat packet

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.

Unique Features of Low Power Gsm Modules, lBS base station location

LBS base station location can get location information of USR-GM3 by mobile network.

Socket b function of Gsm Modules is suitable for such requirements as sending data to two servers

Socket b function is suitable for such requirements as sending data to two servers, data backup and remote abnormity diagnosis.

ftp remote upgrade of Low Power Gsm Modules

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.

Support PUSR Cloud

Application Field of Low Power Gsm Modules

Agricultural IOT Environment Monitoring Solution

Agricultural IOT Environment Monitoring Solution for Gsm Modules

Charging Pile Data Real-time Transmission Solution

Charging Pile Data Real-time Transmission Solution for Gsm Modules

City Bus Real-time Data Acquisition Solution

City Bus Real-time Data Acquisition Solution for Gsm Modules

Remote POS Online Payment Solution

Remote POS Online Payment Solution for Low Power Gsm Modules

Image of Low Power Gsm Modules

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 / httpsD
Network Protocol	TCP,UDP,DNS,https
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

after-sale guarantee

Working Time：

Monday to Friday 8:30-18:00 in Beijing time. Message us online for a quick response when we are on-work. Or you can leave a message. Our sales will contact you as soon as possible. You can get free technical support & professional support for your project on our technical support h.usriot.com. Get in touch with us via email at sales@usriot.com. We want to help with any questions you have.

Delivery：

We will deliver goods as soon as possible after we received the order. The order generated on weekend and holidays will be handled after back. We ship the goods with the following carriers TNT, DHL, FedEx, UPS, shipping agent.

Warranty：

We provide one year's warranty of modules and two year's warranty of cellular routers, cellular modems, serial device servers for any reason. If you believe the item is defective and under warranty, please submit a Return or Exchange request on the product's support page, or contact us at support@usriot.com.

—Network Infrastructure—

● Cellular Routers

● Industrial Switches

● Industrial Wireless

—Device Networking—

● Serial to Ethernet/WiFi

● Cellular Modems

● LoRa Network

● IoT Modules

—Edge Control—

● IoT Gateways

● Open Source Gateway

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