I found in LA sw v5.30 it is not possible to store-recall by Setup Config or Setup&Data (.ala)
an External Trigger Output setting, if "Feedthrough" mode activated - is it correct functionality ?
"Polarity" setting is has no problem of that kind. 16902B frame...
It is not convenient to go every time to Setup -> External Trigger Menu, and change it manually!
Yes, it's a bug, and has been entered into the system for repair,
Additional settings were added to the External Trigger configuration window a few revisions ago, and through an oversight, those settings were not added to the configuration file. When you load a file, nothing is loaded for those setting, so they revert to the defaults.
It will be repaired at some point, but I don't have a planned date.