求翻译：所谓“一线”，就是一条线通多种信息，多种不同的设备都挂在一条线上，通过一条线跟PC机一个接口把所有的设备都串起来，进行不同数据的信息交换。如果很多设备都挂在PC机上，那么每台设备跟PC机就占了一条线，而PC机都需要给它提供通讯接口。这样，设备多，通讯接口多，而计算机的的通讯接口是有限的，并不能满足要求。而且在安装使用过程中，做不到那么多线都跟PC机相通，这种做法是不可取的。是什么意思？

The so-called "line" is a line through a variety of information, a variety of different devices are hung in a line, a line with a PC through an interface to all devices to string together the different data information exchange. If many devices are hung on a PC, then each device with the PC accounte

So-called "first-line" is a line that links a range of information, and a variety of different equipment will hang on a line and a line through PC machine with an interface to all the equipment together with different data, the information exchange. If many devices are hung in PC machine, then each

So-called “”, is a line passes the multiple messages, many kinds of different equipment all hang in on-line, all strings together through a line with a PC machine connection all equipment, carries on the different data the exchange of information.If very many equipment all hang on PC machine, then e

The so-called "Frontline" is a line through a variety of information, a variety of different devices are hanging on a line, a line through an interface with PC machine string together all of the devices are, to different data information exchange. If many devices are hanging on the PC, then each dev

So-called “”, is a line passes the multiple messages, many kinds of different equipment all hang in on-line, all strings together through a line with a PC machine connection all equipment, carries on the different data the exchange of information.If very many equipment all hang on PC machine, then e