在DAQmxCreateCOPulseChanFreq函数的说明中提到：除非选择了不同的输出端子，否则脉冲会出现在默认的输出端子上（
The pulses appear on the default output terminal of the counter unless you select a different output terminal.
），请问此处如何选择别的输出端子即PFI口
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