Product Name：GSM GPRS 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 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.
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 Buffer||Send: 4K bytes, receive: 4K bytes|
|Interface Standard||TTL: SMT 2.8 ~ 3.6 V|
|Baud Rate||2400 bps ~ 921600 bps|
|Buffer||Send and receive 4k bytes respectively|
|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|
|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|
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 firstname.lastname@example.org. We want to help with any questions you have.
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.
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 email@example.com.