The number of the MIO card associated with this logical
channel. If this logical channel is not associated with
an MIO card a zero is returned. The value returned for
each logical channel is the MIO card's physical slot
number. The list of supported values should be
documented in the device POS.
Additional information:
The value returned will be zero for channel 1.
If an IIO card is installed, channels 2..8 will
return a value of one or two.
If a second IIO card is installed, channels 9..15 will
return a value of one or two but not the
same as channels 2..8.
When two IIO cards are installed, the value
returned by any channel 2..15 may change after the
printer is power cycled.