Two problems prevented acquiring the SHG fast channels:
Now fixed.
We found a loose cable inside TTFSS which prevented the readback of the LO monitor. We then tested the remote controls for the TTFSS and fixed a problem with the excitation enable logic and the gain slider calibration. The laser crystal temperature was also a factor of 5 too high, since the slow controls signal through the TTFSS implements a voltage divider. We also connected the fast channels. The only thing missing now is the HV.
Most of the DC PDs had the wrong configuration in TwinCAT. Now fixed.