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在智能化仪器中,随着PC机的普及,人们都趋于接受由PC或其兼容机控制的仪器.由于某些原因,有些仪器的计算机接口使用IEEE 488 GPIB标准,然而PC及其兼容机都不直接支持该种标准,这些仪器的应用有许多不便.IEEE 488 接口是并行接口,PC及其兼容机支持并行的打印口,通过它可以输出控制线和读入状态.笔者发现,对于具有IEEE 488接口的“听”设备,通过软件,赋予打印口的输出控制线和输入状态线以IEEE 488接口相关信号线的含义,不增加硬件设备,也可以实现与这类仪器的通信.
With the proliferation of PCs, people tend to accept instruments that are controlled by a PC or its compatible machines in intelligent instruments, and for some reasons the IEEE 488 GPIB standard is used for computer interfaces in some instruments. However, PCs and their compatibles Not directly support the standard, the use of these instruments have many inconveniences. IEEE488 interface is a parallel interface, PC and compatible machine supports parallel printer port, it can control the output line and read in. The author found that, with the IEEE 488 interface “listening” device, through the software, given the printout of the output control line and the input status line IEEE 488 interface, the meaning of the relevant signal line, without adding hardware devices, but also to achieve communication with such instruments.