对于通信口为RS- 232串行口的机床，必须应用协议转换联网控制策略。
We introduce protocol conversion uniting web strategy to get over the machine tool with RS-232 serial.
SIM读卡器和手机数据接口是基于PC机串行通信口，利用一片74hc14芯片实现接口功能。
SIM reads the card and the handset data interface is based on the PC machine serial port, USES a piece of 74hc14 chip to realize the interface function.
作为一种相对简单的通讯协议，在电子标签系统中常采用的RS485串行通信口具有一定的局限性。
As a simple protocol, RS485 has some limitations in some aspects which is usually used in Electronic Tag system.
作为一种相对简单的通讯协议，在电子标签系统中常采用的RS485串行通信口具有一定的局限性。
As a simple protocol, RS485 has some limitations in some aspects which is usually used in Electronic Tag system.
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