Hello. Yes it's possible I did it some years ago. You need step5 (v.7.23 with hf) software and converter rs-232 to TTY (current loop interface) which you can do by yourself
from here. And may be read Programming in Step5 book wrote by Berger. All of this could be found
here. And one more I can do it only on Windows XP or less, on forward versions nothing was connected. I have manuals about 115U: over 600 pages about. If you need it or anything above (program or book), I can upload it, because i don't know if this books are here, I think it should be.