The LVB Tracker Box provides an inexpensive, reliable interface between
Windows, Macintosh, or Linux computer tracking software and the popular
G-5400, G-5500, and G-5600 Yaesu azimuth and elevation rotators. The
front
panel LCD shows the current and future directions of the antennas.
Convenient buttons allow manual control. The unit is powered by the
rotator
control box though the provided DIN cable.
https://www.amsat.org/product/lvb-tracker-complete/