信号就是软件中断，可以向正在执行的程序(进程)发送有关异步事件发生的信息。
Signals are software interrupts that send information about an occurrence of an asynchronous event to an executing program, or process.
通过异步扩展芯片TL16C554实现了扩展4路串口，并完成4路信号的实时接收和发送，实现了集中器与4个子机的远距离通信；
In this paper, four serial ports were expanded by TL16C554 and remote communication between repeaters and four slaves was realized.
通过异步扩展芯片TL16C554实现了扩展4路串口，并完成4路信号的实时接收和发送，实现了集中器与4个子机的远距离通信；
In this paper, four serial ports were expanded by TL16C554 and remote communication between repeaters and four slaves was realized.
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