Referring to FIG 27, reference symbols SR1 to SR6 denote {HEAD ~ status request commands} corresponding to {TAIL ~ statuses} 1 to 6 in FIG 28; PSON, a power save command for reducing power consumption of the fixer 331; and PSOF, a release command for releasing the power save mode 
corresponding to
Referring to FIG 27 , reference symbols SR1 to SR6 denote { HEAD ~ status request commands } corresponding to { TAIL ~ statuses } 1 to 6 in FIG 28 ; PSON , a power save command for reducing power consumption of the fixer 331 ; and PSOF , a release command for releasing the power save mode
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