Embedded Serial Device Server Model: USR-GM3 ■ ■ ■ Overview ------------------------------------------------------------------------------------------------------------------------------------------------- USR-GM3 is a highly-integrated UART to GSM / GPRS module in tiny size, which can be embedded in your pcb design to easily make communication among serial device, cellphone and network device. This module can realize two-way data transparent transmission between COM and GPRS/GSM network by using a SIM card. ■ ■ ■ Main Features------------------------------------------------------------------------------------------------------------------------------------------◆ Built-in Antenna Interface ◆ Use single module, embedded TCP / IP Protocol stack, without external CPU, Higher stability ◆ 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 2 Channel, can send the same data from serial port to different servers ◆ Transparent transmission, can take place of data transfer radio, don't need to change your original system ◆ Support configure by Computer set-up software / Serial AT Command / SMS AT Command ◆ Support virtual serial port, FREE software

Port Number Interface Standard Standard Frequency GPRS Multi-slot Class GPRS Device Class Baud Rate GPRS Coding Schemes CS1 ~ CS4 Max Launch Power Serial Buffer GSM standard AT instruction set USR extension AT instruction set Application Flow Control Send: 4K Bytes Receive: 4K Bytes Device Interface Data transmission SMS transmission Speech Interface Network Protocol Disconnection Buffer 1 channel MIC input 1 channel SPEAK output Network Link Count Network Buffer Send: 4K Bytes Receive: 4K Bytes Basic Parameter Virtual Serial Software Windows 2000 or higher (32 bit / 64 bit) 2 years Operating...