[Elecraft] KX2 + KXPA100 = weird CAT behavior

[W6IPA]

Hi,

I am trying to get the decoded CW out of the kx2 usb/serial port using the CAT TT1;/TT0; commands.
This works fine on the KX2 with direct connection - however, when going through the KXPA100, 
instead of receiving only the CW characters, there is a ^FL;  appended, like this:
A^FL;B^FL;C^FL;D^FL;E^FL;F^FL;G^FL;S^FL;I^FL;

Is it a case where TBX should be used like for the PX3 case ? Any insight ?

Thanks,

JC/W6IPA.