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本刊1982年第一期上介绍了电话线载波的数字显示仪表(有关线路图请参阅本刊1982年第一期)。一些读者希望介绍图中运送清零和计数脉冲的形成过程,这里介绍我们已应用的两种电路。图1 是将 A 处的模拟量(DDZ-Ⅱ系列仪表中的0～10mA 输出)转变为数字量,同时经电话线载波运送到 B 处显示;图2是将 A 处的数字量(计数的锁定寄存数据)经电话线运送到 B 处显示。两种线路均能准确地传递数字,使 A、B 两处显示出完全一致的数字。
The first issue in 1982 on the telephone line carrier digital display instrument (the circuit diagram, see the first issue of 1982). Some readers would like to introduce the process of clearing the zeroes and counting pulses in the figure. Here are the two circuits that we have applied. Figure 1 is the A Department of analog (DDZ-Ⅱ series instrument 0 ~ 10mA output) into a digital volume, while the telephone line carrier to B at the display; Figure 2 is the digital at A (count Lock register data) to the B by telephone lines to display. Both lines can accurately pass numbers so that A and B show exactly the same numbers.