Modem Control Input Status

      If a bit has a value of 1, the condition is on. If a bit has a value of 0, the condition is off.

      Bit 0-3

        Undefined
      Bit 4
        Clear To Send (CTS)
      Bit 5
        Data Set Ready (DSR)
      Bit 6
        Ring Indicator (RI)
      Bit 7
        Data Carrier Detect (DCD)

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