Robotron K 6314 was a dot-matrix printer manufactured in the East Germany in 1980s. It could be connected to a variety of computers thanks to a replaceable communication module. My printer seems to be working fine as far as I can test it with the buttons available on the front panel. I don’t have a working Robotron machine at the moment that is equipped with V.24 interface to test it to the full extent.
This is a V.24 interface module, a number of other interfaces were available for this printer as described on this page.