从RS232口获取+5V电源

How to Get+5V Power Source from RS232 Interface

由于RS232通信接口协议简单,工业控制系统已广泛应用RS232口对各种设备进行信号采集和控制。为了降低成本,缩小体积,这些输入输出设备可直接从RS232口获取控制电路所需的+5V电源。文中介绍了从RS232口得到+5V电源的几种变换电路。

Since the protocol for RS232 is simple, RS232 has been widely used in various equipment to collect and control the signal data in industrial control system. In order to cut down their costs and reduce their dimensions, you can get + 5 V power source to control the circuit directly from RS232 interface in I/O equipment. The paper illustrates some conversion circuits of how to get +5 V power source from RS232 interface.