ROLL DATUM OFFSET
From what I have read, this may work on other systems, it did on mine.
I have been trying to get RSGS 130 to operate without any roll offset or tilt jitter for a long time. It is true the software really sucks, it crashes, looses comms, the comms when working are tempermental at best. However, I have managed to get the offset reduced to near zero on the roll and tilt judder to a minimum. It is all about being patient with the tuning and gains settings and getting the load central on the bed plate.
When making alterations to the gains, they sometimes jump to max and the software crashes, if this happens you need to unplug the associated servo plug from the controller, restart the controller, re-connect your pc via the software and change the maxed out setting, but to do this, do so in the numerical field only, do not try the slider bar, the system will crash again. when the setting is back in the real world save and exit.
I have found that to set the roll offset the only way to do this is by changing the setting in the number field and it is done by trial and error, small trims at a time. Do not try the "Set Level" buttons, they do not work.
1st. With the servos off, set the tray level manually, this may not help but gave me peace of mind.
2nd. Connect the PH controller to the power. Wait for it to completely start.
3rd. Connect PC, start the programme and select "connect" from the pull up menu, you may have to do this several times before it does so. In the "Tuning" tab note the "Roll Centre Tune" figure and write it down.
4th. Turn servos off from the pull up menu.
5th. Increase / decrease by 2 to 4 units at a time in the numerical window only and press enter.
6th. Turn servos on from the pull up menu.
7th. Repeat this procedure until the correct setting is obtained.
Sometimes the number you enter results in the system rejecting it and entering its own max offset, sometimes it will result in a crash, others it does not, however you need to take control of the system again and enter a different number, some times it can be just one digit above or below the number used previously.
For information I found the following gains okay for use with a SLR, Canon EOS 550D
Tilt Pos Roll Pos Tilt Vel Roll Vel
95 138 25 100
I know these setting may not work for everyone but they work well for me. Good luck with what appears to be very good hardware let down badly with very poor software.
A