调制解调器（即Modem），是计算机与电话线之间进行信号转换的装置，由调制器和解调器两部分组成，调制器是把计算机的数字信号（如文件等）调制成可在电话线上传输的声音信号的装置，在接收端，解调器再把声音信号转换成计算机能接收的数字信号。-Modem (Modem), is a computer and telephone line between a signal conversion device that consists of two parts, modulator and demodula

计算机数据采集系统、测量和自动化系统的软件构件、数据采集设备组成介绍。(Computer data acquisition system, measurement and automation system software components, data acquisition equipment composition.)