这是一个MODBUS协议的串口接收和发送程序，其特点在于采用了中断接收方式，边接收边进行MODBUS协议常用功能的检查（如其3、5、6、16号），并根据MODBUS协议，设置了后门，可以方便厂家在维护时的便利-This is a MODBUS protocol serial port receive and transmit procedure is characterized by the use of the interrupt reception mode while receiving

手机源码 为后门的相关源码 可以参考手机开发-back、door

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