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IBM-PC/XT机以及各种兼容机是目前最流行的计算机。这些计算机都有1～2个空余的RS-232异步通讯接口。两台计算机的RS-232接口如何连接是决定能否通讯的关键,而且不同的连接方法,应采用不同的程序方法通讯。 在IBM微机系列中,RS-232接口是采用标准的25芯D型插座,为达到两机通讯的目的,接口的接线方法可分为多种形式,下面简介三种接线方法。 首先我们了解一下RS-232串行接口信号和25芯插座的对应关系。见图1所示。
IBM-PC / XT machines and a variety of compatible machines are by far the most popular computers. These computers have 1 or 2 spare RS-232 asynchronous communication interfaces. How to connect two computers RS-232 interface is the key to determine whether the communication, and different connection methods, should use different program methods of communication. In the IBM microcomputer series, RS-232 interface is a standard 25-pin D-type socket, in order to achieve the purpose of two-machine communication, interface wiring methods can be divided into a variety of forms, the following three wiring methods. First, let’s look at the correspondence between the RS-232 serial interface signal and the 25-pin socket. See Figure 1 below.