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Hey all - I'm new to LTN and I've been trying it out for a bit now. I've been going off of the blueprints provided in the first post of the station design thread and everything mostly works great. The one thing I'm confused about is the requester blueprint (v1 and v2).

It says it's supposed to only unload items that are requested. This does not seem to happen in practice. For example I have a copper plate drop-off station that I converted to an LTN Requester station. I set the copper request to -20k. The first train came and it had a bit of stone in it that was also unloaded to my station even though I didn't set a request for it. I tried v2 as well with the extra decider combinator and that didn't work either. I've also experimented with adding other "junk" items to my train and they also got unloaded.

Am I missing something here or is this supposed to happen? From following the circuit design it seems like this is what you would expect. The train contents are being merged with the negated requested content so anything extra would simply be sent to the filter inserters un-modified (ie. in this case the residual stone) causing them to include that in their filter.

Obviously it would be easy for me to work around this by setting the copper plate filter explicitly, but then what is the whole point of the "smart filter" system?

LTN does only remember items in the wagons which were loaded on a LTN provider in the dedicated run.

If you put items manually in it or have residues from the previous run, they don't get detected and so not filtered out at the smart unloader.

Ah I see..so does that mean I need to make sure and clear the inventory of the train at the depot after every delivery?

yemault93 wrote: Thu Jan 02, 2020 7:24 pm Ah I see..so does that mean I need to make sure and clear the inventory of the train at the depot after every delivery?

Technically yes.

Better would be, to don't have residues at all.
Reason can be not enough space to unload at the requester or finishing unloading to early.

I personelly don't limit the unloading, only the loading.