The query returns D0, D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13,
D14, D15, CHAN1, CHAN2, CHAN3, or CHAN4.
:TRIGger:SPI:CS CHANnel2
/*Sets source channel of the CS line when the trigger condition of SPI is set to CS
to CH2.*/
:TRIGger:SPI:CS? /*The query returns CHAN2.*/