我需要在计算机上读取编码器的输出信号，再通过NI CompactDAQ数字模块输出为0~5V高低电平信号（原编码器输出信号，信号类型为5VTTL单方波，见附图）.我在官网上查找C系列数字模块选型，想请问“数字I/O逻辑电平”这栏，5V和5VTTL有什么区别？我应该选哪种？
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