模拟RS232接口程序,应用在没有RS232接口的低端单片机,程序用PIC16C54汇编编写,如用其它单片机,用户可参考所用单片机资料,自行修改.-Analog RS232 interface program, the application in the absence of low-end microcontroller RS232 interface, the program compiled with the PIC16C54 written, as with other devices, the user can refer to the information used by SCM, self-modification.