microHAM Digi Keyer II Instruction Manual page 30

Additional functions can be associated with the footswitch (or hand mic PTT). DIGI KEYER II recognizes
when the footswitch is closed (pressed) or open (released) and can manipulate CW, FSK, PTT and audio
routing when the footswtich is closed or opened.
Mute serial CW - if checked, serial CW (DTR or RTS) from an
application program will be muted while the footswitch is
pressed. If Restore serial CW is checked, CW will
resume when the footswitch is released (if it has not
already ended). If Restore serial CW is not checked,
application generated CW will remain suppressed until
the application releases PTT.
Mute serial FSK - if checked, the FSK ports will be blocked
while the footswitch is pressed. If Restore serial FSK is
checked, FSK will resume when the footswitch is
released (if it has not already completed). If Restore
serial FSK is not checked, FSK will remain suppressed
until the application releases PTT.
Restore serial PTT and audio - if checked, application generated serial PTT will be restored and audio
routing will return to the "serial PTT" setting when the footswitch is released. If Restore serial PTT
and audio is not checked, audio will only return after the application releases PTT.
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FOOTSWITCH SEQUENCER
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