Abstract: In order to achieve low-cost but highly reliable data communications for several kilometers, the communication program is designed as the core of the embedded modem and Micro Control Unit(MCU). MCU sets MT9234 module through AT commands. PC connects with MT9234 module by the level-shifting interface circuit. Two MT9234 modules uses twisted pair to establish the data communication after three stages of the handshake process in leased line mode and ultimately builds communications between PC and remote MCU. Hardware simulation results show that, compared with traditional modem, remote data communication in leased line mode is farther and faster.

Key words: embedded Modem, leased line mode, data communication, AT command, MT9234 module

摘要： 为实现低成本、高可靠且传输距离达几千米的数据通信，提出一个以嵌入式Modem和单片机为核心的通信方案。单片机通过AT指令对嵌入式Modem MT9234模块进行设置。PC通过电平转换接口电路与MT9234模块相连，MT9234模块之间利用双绞线相连，并经过3个阶段的握手过程建立数据通信，从而实现PC与远方单片机间的通信。硬件仿真结果表明，与传统Modem相比，专线模式下的数据通信传输距离更远、速度更快。

关键词: 嵌入式Modem, 专线模式, 数据通信, AT指令, MT9234模块

CLC Number: 

• N945