SDO 0x1000, "Device type"
  0x1000:00, r-r-r-, uint32, "Device type"
SDO 0x6000, "Inputs"
  0x6000:00, r-r-r-, uint8, "Subindex 000"
  0x6000:01, r-r-r-, bool, "Status"
  0x6000:11, r-r-r-, int16, "Value"
SDO 0x7000, "Outputs"
  0x7000:00, r-r-r-, uint8, "Subindex 000"
  0x7000:01, rwrwrw, bool, "Control"
