In {HEAD ~ the sixth invention} according to the present invention, when the host unit recognizes that a plurality of {TAIL ~ printing apparatuses} are set in the standby state, the host unit sends a command for setting one of the printing apparatuses in the sleep state to the interface section 
In { HEAD ~ the sixth invention } according to the present invention , when the host unit recognizes that a plurality of { TAIL ~ printing apparatuses } are set in the standby state , the host unit sends a command for setting one of the printing apparatuses in the sleep state to the interface section
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH