I never said the individual guns need to perform the trajectory calculations. Just that the possibility exists with a computer by the gun. Whether each gun should do this or let the battery do this is a matter of doctrine for each military and not technical capability.
I don't know what fuse setter you have, but the fuse setter that the M777 uses doesn't come with a keyboard to punch in target coordinates with. It needs to be hooked up to an external electronic device to receive the data from. Could that external electronic device be portable and come with a keypad/keyboard and receive digital data from the battery? Certainly yes. At the very least you could show a picture or diagram of the system you are talking about?
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I should clarify that the computer associated with the howitzer (not necessarily attached directly to the gun) can also be used for C2 purposes (i.e. receiving and responding to digital orders). The purpose is not necessarily just for collecting and sending data from the instruments on the gun.
Tracking barrel wear and manufacturer discrepencies in the propellant and projectile using a muzzle velocity radar, temperature sensor and other "electronics" applies to both guided and unguided rounds.
Don’t want to derail the thread, so this is my last post on this. As I said, I don’t know M777 specifically. I’m not sure what the disconnect is, seems like we have some kind of initial misinterpretation over some minor detail, but my only point was that the rounds can be programmed by an external device. Even that slide deck shows it is possible.