本文目录一览:
- 1、什么是com接口
- 2、COM接口是什么,有什么用
- 3、什么是COM接口
什么是com接口
一)COM接口就是指Cluster communication port接口,即串行通讯端口。有9 针D 形连接器,也称之为RS-232接口。
也有的使用的是老式的DB25 针连接器,也称之为RS-422接口,这种接口目前已经很少使用。
二)也有人将COM component(COM组件)的接口称COM接口
COM component(COM组件)
COM中的接口是一组由组件实现的提供给客户使用的函数。
COM接口是什么,有什么用
COM接口是指cluster communication port接口,即串行通讯端口。
现在的PC 一般有两个串行口COM 1 和COM 2 。通常 COM 1 使用的是9 针D 形连接器,也称之为RS-232接口,而COM 2 有的使用的是老式的DB25 针连接器,也称之为RS-422接口,这种接口目前已经很少使用。串行口不同于并行口之处在于它的数据和控制信息是一位接一位地传送出去的。 虽然这样速度会慢一些,但传送距离较并行口更长,因此若要进行较长距离的通信时,应使用串行口。
一般机箱有两个,新机箱有可能只有一个。笔记本电脑有可能没有。
有很多工业仪器将它作为标准通信端口。通信的内容与格式一般附在仪器的用户说明书中。
什么是COM接口
COM接口 有两种:
一种是电脑连接外接设备用的接口;
另一种是 COM:The Component Object Model 组件对象模型 提供的接口;
电脑连接外接设备用的接口 COM口,平常称为串口,如果电脑有这样的外连接口,在设备管理器里可以看到COM1,COM2这样的驱动接口。
Component Object Model 这种COM口,是软件接口,属于组件接口,可以用多个具备COM 组件接口的软件组合成一个功能强大而且复
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