Kantronics KPC-3 Plus - Cannot Return to Command Mode

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2. If using a ―fixed level‖ (i.e., the RCV LED stays on all the time) Receive Audio from
the radio, which the volume and squelch do not change, set the CD parameter to
SOFTWARE.
Cannot Return to Command Mode
The single most common cause of this is that the STOP character (and usually XOFF)
have been inadvertently set to the same as the COMMAND character. This is usually
caused by the use of the dollar sign ($) as a streamswitch. If you use the $, be aware
that you cannot enter hex values without PASSing the dollar sign. Symptoms for this
usually are that you can talk to the KPC-3 Plus fine in Command Mode, you can usually
talk to others on the air, but you just can‘t get back to Command Mode. With most PC
terminal programs, pressing <Ctrl+C> will display the heart character, but you still don‘t
get the cmd: prompt.