RS-232 Troubleshooting
应用文章
In the course of dealing with personal computers, you may use the RS-232 serial interface. This application note will describe RS-232 at a basic level, with an orientation towards Windows-based instrument programming.
An Overview of RS-232
The first question that needs to be addressed is: what precisely is a “serial” interface?
Consider a computer connected to an instrument or other “remote” device. One of the simplest possible communications schemes is shown in Figure 1.
Each device sends data bits coded as electrical pulses, with a “0” corresponding to a low voltage and a “1” a high voltage, to the other over a dedicated line, using a shared ground line. Using separate lines to transmit and receive data allows both devices to send data simultaneously without interference, at least in principle.
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