直流电压单通道/双通道测量可选；自由设定两个测量通道的基准上下限；判断结果可以通过LED显示；测量结果通过RS232输出；宽工作电源：+4.0V---16VDC； -DC voltage single/dual-channel measurement options free to set benchmarks for measuring channel two upper and lower limits results can be judged through LED displa

实现了上位机与51单片机的232串口通信，可以显示实时数据曲线，设置报警上下限。-Realization of PC and 51 microcontroller 232 serial communication, you can display real-time data curve, set alarm limits.