这是新华龙（www.xhl.xom.xn）开发的，基于单片机，现在可以在它的网站上免费下载，不过当初他可是花了500大元买的。...

详细介绍RS-485/422原理与区别、元件选择、参考电路、通讯规约、程序设计等方面的应用要点，以及在产品实践中总结出的一些经验、窍门-Detail the difference between theory and RS-485/422, component selection, reference circuits, communications statute, procedures for the application of design elements, as well as practice in the products sum up the experience, know-how

整有效。中间四个字节分别代表设备的地址、指令类型、指令参数1(OPT1)和指令参数2(OPT2)。设备在对这四个字节的内容进行译码后执行相应的操作

我自己编写的74HC595数码管显示程序,一个595驱动两个共阳极数码管-I have written 74HC595 digital tube display program, a total of 595 drive two digital tube anode

基于proteus模拟仿真的单片机开发实例，很简单，很实用，供大家参考学习-Proteus simulation based on microcontroller development examples, very simple and very practical, for your reference study

串口通信实用程序,适合初学者做串口通信实验,-Serial communication utility, suitable for beginners to do serial communication experiments

vb做得自动报警系统，可以设置传输率，做到实时监测-vb doing automatic alarm system, you can set a transmission rate, to achieve real-time monitoring

51单片机通讯类软件。菜鸟级别。希望大家多多指点！-51 single-chip communications software. Rookie level. I hope everyone a lot of advice!

单片机叮咚门铃，52单片机示例，程序简单，适合初学者下载-SCM ding-dong doorbell

51单片机驱动24C02存储器 可以学习IIC总线-51 Single-chip driver 24C02 memory can learn IIC bus

c51应用程序设计 c51应用程序设计-decoder application design decode r application design decode r application design