本文分析介绍了仪表总线(Meter Bus 简称MBus) 信号,并就此设计了两种232 电平到MBus 总线信号的转换接口 电路及其总线供电电路,其中简易主机接口简单易用,成本低廉,多负载主机接口驱动能力强,有很好的可靠性-Instrument Bus is introduced in this paper, analysis (Meter Bus MBus) signal, and has designed two kinds of 232 level to MBus Bus signa