My K2 will not work on rigi id model 221.
I works very nice on the rig id model 231

Settings:
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RigCtldPath:/usr/bin/rigctld
RigCtldArgs:-m %m -r %r -t %t -s 4800
RunRigCtld: TRUE
RigDevice: /dev/ttyS4
RigCtldPort:4533
RigCtldHost:localhost
RigPoll: 300
RigSendCWR: FALSE
RigId: 231

Starting RigCtld ...
/usr/bin/rigctld -m 231 -r /dev/ttyS4 -t 4533 -s 4800
rigctld started!
Result0:N
Result1:Y
Result2:Y
Connected to localhost:4533