Check the listing for details. Serial RS232 COM to IP GPRS GSM Mobile Converter Data Transmit Module. Condition: New. Listed at 73.99 USD. Presents: GPRS DTU (Data Transfer unit) is a wireless terminal equipment which can convert serial data to IP data or convert IP data to serial data, then transmit through the GSM wireless communication network. GPRS DTU uses available GSM - GPRS network (ex ATT , T-Mobile) to transmit data, it adopts industrial-grade embedded processor, embedded TCP/IP protocol stack. To provide users with virtual private networks, which is high speed, stable and reliable, data terminal online forever, and a variety of protocol conversion. Function features Easy to use, only configure few parameters;Use single module, embedded Protocol stack, without external CPU,Higher stability;Support RS232(optional RS485) interface.Embedded TCP/IP protocol stack and GPRS technology;Support remote parameters settings, can change IP, port, ect. by SMS;Supports all GSM network, four frequency for global usage. Doesnot support CDMA/3G/EDGE;Support public and APN network access;Can configure heartbeat pack data format, transmit interval, and keep connection with server. Can configure log pack data format and automatically establish network connection with server;Support data length control, can set the length of single sending package and data pack waiting time;Support ALWAYS ONLINE mode, and dropped reconnect;Completely transparent transmission, can take place of data transfer radio, no changes needed on your original system;Use aluminum alloy case, shielding external disturbance effectively;Matched sucker antenna, convenient for customers install and use inside the iron case;Support KEEP-live, can maintain connection if there is no heartbeat packet;Support network connection in Max 4 Channel, can send data from serial port to differnet servers;Support remote parameter configuration, can configure all parameter by sending AT command via SMS;Support password authentication by remote configuration;Support HTTPD Client Specifications Network StandardGSM / GPRS Rate14.4 Kbps ~ 57.6 Kbps Standard Frequency Range850/900/1800/1900MHz GPRS Multi-slot ClassGPRS Class 10 GPRS Terminal Device ClassClass B GPRS Coding SchemesCS1 ~ CS4 Max Launch PowerGSM900 class4（2W），DCS1800 class1（1W） ApplicationGSM standard AT instruction set / USR extension AT instruction set / data transmission / SMS transmission Network ProtocolTCP，UDP，DNS，Httpd client Network Link Count4 Disconnection Buffer4 x 15K bytes (each link has 15K bytes) Network Receive Buffer30K bytes Serial Port Number2（1*RS-232，1*RS-485，can not work at the same time） Interface StandardRS-232：DB9 cellular type，RS-485：3 wire（A，B，G） Data Bits5，6，7，8 Stop Bit1，1.5，2 Check BitNone，Even，Odd Baud Rate300 bps ~ 115200 bps Flow Controlnull Bufferreceive 1k bytes RS-485 Pull-up and Pull-down Resistor2.2 KΩ Device Interface Antenna Interface50Ω/SMA-K（female terminal ） SIM Card1.8V / 3V Speech Interfacenull Software Virtual Serial（USR-VCOM）Windows 2000 or higher（32 bit/64 bit） Configurationcomputer set-up software,serial command,sms command Package Contents :USR-GPRS232-710 Main Module 12V 1A Power Adapter GPRS antenna Requirement : - 1.) Serial Cable , 2.) GSM SIM Card 3.) Computer Setup for Configuration. Software & Manuals : Available as a Download.