Controlling a WD My Book enclosure's sleep timer from Linux via SES/SCSI

I wanted to change the automatic sleep/spindown timer of an old WD My Book 111D under Linux. The important detail is that the setting belongs to the WD enclosure/USB bridge, not to the HDD's ATA APM settings. Hardware My device: WD My Book 111D USB VID:PID 1058:111d SES firmware: 1049 HDD: /dev/sdc WD SES enclosure: /dev/sg4 lsscsi -g shows:...