mitsub_vfd(1) on Linux
The text 44978cf51590, as Debian 12 (Bookworm) shipped it.
HAL userspace component for Mitsubishi A500 F500 E500 A500 D700 E700 F700-series VFDs (others may work) This uses the COMPUTER LINK protocol _not_ MODBUS. The connection is made through the PU connector.