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  There are two different SM5100B: DTU: http://www.cutedigi.com/product_info.php?products_id=4400 and AT mode: http://www.cutedigi.com/product_info.php?products_id=4165   The one you are reading is DTU version.   DTU is much powerful than AT mode version and can be downgraded to AT mode version. here is a step-by-step guide: http://www.linksprite.com/article/shownews.php?lang=en&id=24 SM5100B shield tutorial: http://www.cutedigi.com/forum/viewtopic.php?f=22&t=5579     This documents show it's so easy to use this GPRS DTU. http://www.linksprite.com/pub/tutorial/LinkSprite-GPRS-DTU.pdf   What's the difference between a DTU modem and the regular SM5100B module?   DTU modem is a super set of regular SM5100B module. DTU can allow transparent communication while regular SM5100B module uses AT commands.     USA providers are all on 850/1900Mhz and pratically all the rest of the world uses 900/1800Mhz. LinkSprite SM5100B GPRS-DTU supports both original SM5100B's AT command and DTU mode. In DTU mode it has the following feature: 1.    Integrated TCP/IP Stack        LinkSprite GPRS-DTU has integrated TCP/IP Stack. Users can treat the LinkSprite GPRS-DTU as a transparent serial port without the knowledge of TCP/IP stack.  2.    Bi-directional Serial port to TCP/IP transparent data communication        LinkSprite GPRS-DTU can do transparent bi-directional serial port data to TCP/IP packet bridging. In another words LinkSprite GPRS-DTU will pack the raw data from serial port to TCP/IP packets without the need to change the original data and the receiving host side software can restore the TCP/IP packets to the raw serial port data. So LinkSprite GPRS-DTU can be used with the devices that using serial port with any modification to the devices.   3.    Support heart beat to keep always online The mobile network will disconnect GPRS-DTU from the host when there extended time of quiet. Heart beat mode is to keep GPRS-DTU always connected to host by periodically sending small packets. 4.    Support configurations of parameters and saved to flash LinkSprite provides a GUI utility to configure the parameters such as IP port of host baud rate of serial port etc. User can also opt to use the configuration protocol to send commands to GPRS-DTU to configure the GPRS-DTU. Once configured the parameters are saved to flash and no need for further configuration when power cycled.    Download:                 LinkSprite GPRS DTU Configuration Protocol   Spectrum SM5100B GSM/GPRS module: a miniature single-side board quad-band GSM 850/EGSM 900/DCS 1800/PCS 1900 module ready for integration in various kinds of Fix wireless phones and other wireless devices.   Temperature range Normal range: -10°C to +55°C (full compliant) Storage: -40°C to +85°C Weight < 9g Physical dimensions 35.0X39.0X2.9 mm (typical) Connection 60 pins Power supply VBAT: 3.3V to 4.2V range 3.6V typical. Power consumption Off mode: <100uA Sleep mode: <2.0mA Idle mode: <7.0mA (average) Communication mode: 350 mA (average GSM) Communication mode: 2000mA (Typical peak during TX slot GSM) Li-ion Battery charging management and interface (OPTION) Li-ion Battery charging management is included. The charger interface is provided on 60-pin connector. (only for 3.7V Li-ion Battery) Frequency bands EGSM900 +GSM850+ DCS1800+PCS1900 Transmit power Class 4 (2W) for EGSM900/GSM850 Class 1 (1W) for DCS1800/PCS1900 Supported SIM card 3V/1.8V SIM card. (auto recognise) Keyboard interface 4x6 keyboard interface is provided UART0 interface with flow control Up to 460 kbps Full hardware flow control signals (+3.0V) are provided on 60 pins. UART1 interface without flow control 2-Wire UART interface Up to 460 kbps LCD interface Support standard SPI interface Download: User manual Reference Schematics Antenna Options SMS Application Note GPRS Application Note AT ... » read more

Replacement: http://www.cutedigi.com/product_info.php?cPath=284&products_id=4564 Version 2.0!  This is the shield you need to get Wi-Fi connectivity to your Arduino-based project! This shield provides 802.11b connectivity and is a direct drop-on plug-and-play solution to your Arduino Diecimila/Duemilanove. The second revision of this board has all the components in surface mount form.  The new and exciting feature of the second revision of this board is the addition of a 16Mbit serial flash for storing web pages and other data!  This additional storage space can be used for storing more complex and feature rich webpages as well as sensor type data to be downloaded at a future time. Shield Features Add-on shield built for Arduino Diecimila and Duemilanove Dimensions shape even color match exactly! True plug-n-play solution Uses SPI for host communication (max speed 25MHz) All Arduino headers brought out for easy access Easy access reset button on-board On-board PCB antenna Switchable interrupt pin usage between INT0 and digital pin 8 Switchable LED on digital pin 9 Switchable CS pin for serial flash between digital pin 10 and digital pin 7[1]   Wi-Fi Module Features 802.11b Wi-Fi certified 1Mbps and 2Mbps throughput speeds Supports both infrastructure (BSS) and ad hoc (IBSS) wireless networks Ability to create secured and unsecured networks WEP (64-bit and 128-bit) WPA/WPA2 (TKIP and AES) PSK Low power usage Sleep mode: 250μA Transmit: 230mA Receive: 85mA   Pin Usage SPI Slave select (SS) : Arduino pin 10 (port B pin 2) Clock (SCK) : Arduino pin 13 (port B pin 5) Master in slave out (MISO) : Arduino pin 12 (port B pin 4) Master out slave in (MOSI) : Arduino pin 11 (port B pin 3) Interrupt (Uses only one of the following depending on jumper setting) INT0 : Arduino pin 2 (port D pin 2) DIG8 : Arduino pin 8 (port B pin 0) LED : Arduino pin 9 (port B pin 1) To regain use of this pin remove the LED jumper cap 5V power GND If you setup the serial dataflash CS pin to use pin 10 then the WiFi module will not be usable.  In order to use the dataflash and WiFi concurrently the dataflash jumper CS pin must be set to pin 7.   More information on the software and hardware can be found on the Cutedigi forum. Alway check http://github.com/asynclabs/WiShield/downloads for lastest codebase. Download:     Schematics    ... » read more