详细的GSM-MODEM的AT命令手册，中文版，编程简单快捷。-Detailed GSM-MODEM' s AT command manual, the Chinese version, programming quick and easy.

GSM/GPRS TTL -Modem from rhydoLABZ is built with SIMCOM Make SIM900 Quad-band GSM/GPRS engine, works on frequencies 850 MHz, 900 MHz, 1800 MHz and 1900 MHz. It is very compact in size and easy to use as plug in GSM Modem. The Modem is designed wi