一个简单的PPP协议的源码，可以拨号接入局域网。CPU是M68HC08，适用于工业环境，通过电话线即可拨号上网，传输数据。相比GPRS方案，成本更加低廉。请参考详细的PDF说明文档。-A simple source PPP agreement, you can dial-up access to the LAN. CPU is the M68HC08, apply to the industrial environment, through the telephone line to dial-