+ AA6YQ comments below
Let me look again for the radio settings for baud rate, parity, word length, and stop bits that match your radio's settings.
I'm not sure what to make of this:
a. set the RTS selector to On unless you're using a Kenwood TS-890's USB interface, in which case the RTS selector should be set of Off
b. if an external interface is being used and it derives its power from the serial port's DTR modem control signal, set the DTR selector to On
I think the 'external interface; is the MicroHAM unit, so DTR is On?
+ Since you're using a microHam interface, I will defer to Joe W4TV.