An indication of how many print data channels the I/O
card supports.
Additional information:
This object is used by the IIO card to tell the
peripheral firmware how many logical channels will be used by
the card. This object can only be set once per physical
channel. If an attempt is made to set it a subsequent time
it is ignored and an return code of
<genErr>. is returned.
If new firmware is dynamically downloaded to the I/O
card, and if that firmware uses more logical channels, it is
necessary to reset the printer.