The state of this print data channel. The value
determines whether control information and print data is
allowed through this channel or not.
Additional information:
After telling the peripheral how many logical
channels will be used, the IIO card tells the printer the
state of each of the channels. The state can change from
time to time. The state information is passed using the
channelState object. Values are saved by the peripheral and
reported when users request the value of prtChannelState.