本文档帮助客户更好的使用MD231的模块，从软件和硬件的角度介绍了MD231模块的使用指南，希望能让客户在最短的时间内用好MD231模块。

客户运用MD231有以下两类用法：

1， 把MD231当作标准的GSM/GPRS模块使用，客户通过Com口输入的AT命令使用模块，并从Com口得到模块的反馈信息，此类运用的客户需要外部MCU和Com相连。

2， 客户把MD231运用在无线商话/公话等类似的GSM终端产品上，本公司帮客户定制的软件运行在MD231上，驱动LCD，键盘等外部设备，此类运用的客户不需要外部MCU。-This document is to help customers better use of MD231 module, from the perspective of software and hardware modules are introduced MD231 guide, hoping that customers in the shortest time possible with a good MD231 module. There are two types of customers use MD231 usage: 1, the MD231 as a standard GSM/GPRS module, the customer input through the Com port to use AT command module and the module from the Com port get feedback, such use of the customer needs connected to an external MCU and Com. 2, customers use the MD231, then in the wireless business/public remarks, and the like GSM terminal products, the company customized the software to help run the MD231, the drive LCD, keyboard and other external devices, such customers do not need an external MCU use .