I don't know for the other parameters (number of bits, start, parity, hand shake, etc...) because they are not documented...
73 de Boubker (CN8BSB)
Ability to control the transceiver by CAT protocol (Kenwood TS-440) via USB port.
Switching the speed of data exchange CAT: 57600, 115200.
The rest is standard.
Word Length = 8bit,
Stop Bits = 1,
Parity = No,
Hardware Flow Control = None;
That's what I used as parameters.
It didn't work for me with WSJT-X software.
I will try again (maybe with another cable).