Programming interface schematics for Kenwood :simple RS232 cable, see user manual.
Programming software for Kenwood TS-590S (TS 590 S) :
PDF User Manual for Kenwood TS-590S (TS 590 S) :
Kenwood TS-590S (TS 590 S) Instruction Manual
PDF Service Manual/schematics for Kenwood TS-590S (TS 590 S) :
PDF USB Audio Manual Kenwood TS-590S (TS 590 S) :
Kenwood TS-590S (TS 590 S) USB Audio Manual