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SN74HC4851-Q1: how to tell the high impedance of HC4051

Part Number: SN74HC4851-Q1
Other Parts Discussed in Thread: TMUX4051-Q1, SN74HC4851

Hi team,

My customer wants to use HC4051 as below. But they want to make sure how the microcontroller recognize high level voltage, low level voltage and high impedance(ChannelX suspension) of HC4051. It seems that high level voltage and low level voltage is easy to tell but I am not sure how to tell the high impedance of HC4051. Could you provide your suggestion?