Section 10.2.5 describes how the a Diffractometer PseudoMotor is specified in /online_dir/online.xml. In addition the environment variables DiffracDevice and Psi have to be set, e.g.:
p09/door/haso107d1.01 [2]: senv DiffracDevice controller/diffrace6c/e6cctrl
p09/door/haso107d1.01 [3]: senv Psi pm/e6cctrl/4
p09/door/haso107d1.01 [4]: lsenv
Name Value Type
--------------- ------------------------------- ------
DiffracDevice controller/diffrace6c/e6cctrl str
Psi pm/e6cctrl/4 str
p09/door/haso107d1.01 [2]: wh
H K L = 1.00000 1.00000 0.00000
Azimuth (Psi) = 180.00000
Wavelength = 1.54000
Delta Theta Chi Phi Mu Gamma
93.09800 46.54900 45.00000 90.00000 0.00000 0.00000