Overview
VFD made by ABB, has an option for encoder feedback for closed loop spindle speed.
Software
Page 3 shows the pin mapping from the DB9 to the RJ45.
Page 11 mentions DriveWindow Light 2
Replacement Parts
OPCA-01
RJ45 to DB9 adapter used to program the VFD using PC based software:
$22.50 + $9.90 -- ASEA BROWN BOVERI OPCA-01 / OPCA01 (RQANS2)
Online Resources
ABB ACS550 User’s Manual Rev H 2014-07-04
ACH550-01/02/U1/U2 Embedded Fieldbus Control
ABB general machinery drives ACS350, 0.37 to 7.5 kW / 0.5 to 10 hp Technical catalogue