Device

OBJECT CLASS Device
             isa* ScanObject
  DESCRIPTION: "An analytical device attached to Beam Line 7, ALS, 
                  such as motors, spectrometers, scan devices, 
                  monochromators, the beam."
  REP: deviceNumber
  ATTRIBUTE deviceNumber: [1,1] INTEGER
            DESCRIPTION: "Device number. Possible values are:
                   0 - null, 1 - photon, 2 - motor, 3 - piezo, 4 - quads"
  ATTRIBUTE deviceName: [0,1] CHAR(50)
            DESCRIPTION: "Device name"
  ATTRIBUTE subDeviceMapping (subDeviceIndex, subDeviceName):
            list-of [0,] ([1,1] INTEGER, [1,1] VARCHAR(255))
            DESCRIPTION: "Mapping of integer numbers to sub-devices' names:
	      Device Photon: Subdevice
	      Device Motor: 0 = X, 1 = Y, 2 = Z, 3 = Theta, 4 = Phi
	      Device Piezo: 0 = H, 1 = V
	      Device Quads: 0 = H, 1 = V"
  ATTRIBUTE subdevs: set-of [0,] SubDevice
            DESCRIPTION: "Subdevices of this device"
  ATTRIBUTE nrSubdevices
            DERIVATION: count of subdevs
            DESCRIPTION: "Number of sub devices"
  ATTRIBUTE scanType: [0,1] INTEGER
            DESCRIPTION: "0 = Computed, 1 = Tabulated"

Device and SubDevice are classes that handle the information about the positions in the sample space where measurements are taken from. These classes do not actually correspond to physical devices, but rather map the existing hardware configurations. For example, a motor is a device that has as subdevices, a position in the 3D space and two angles for rotation.