Data record unit complete data acquisition, which records analog quantity data, parallel and serial digital data, parallel and serial graphic data from the signal source to CF card.
数据记录单元完成数据采集，把信号源发送的模拟量数据、并行和串行数字量数据、并行和串行图形数据记录到存储设备的CF卡上。
HCU's input and output signal is mainly analog or on-off quantity.
HCU的输入输出信号主要是模拟量和开关量。
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