Elecraft P3 Programmer's Reference - Manual (Page 3)

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#DSM (Display Mode, GET/SET)
SET/RSP format: #DSMn; where n is 0 (spectrum only) or 1 (spectrum + waterfall).
#FNL (Function Key Label, GET only)
GET format: #FNLn; where n = 1-8, for keys FN1-FN8.
RSP format: #FNLnccccccccc; where n = 1-8 and ccccccccc are the 9 ASCII characters in the key label
for FNn.
#FNX (Function Key Execute, SET only)
SET format: #FNXn; where n = 1-8, for keys FN1-FN8. Executes the function assigned to the key, if
any.
#FXA (Fixed-tune Auto-adjust Mode, GET/SET)
SET/RSP format: #FXAn; where n is 0 (Full screen), 1 (Half screen), 2 (Slide) or 3 (Static) to specify
how far the P3 center frequency moves when the K3 VFO A is tuned off screen in fixed-tune mode.
#FXT (Fixed or Tracking Select, GET/SET)
SET/RSP format: #FXTn; where n is 0 (Tracking mode), or 1 (Fixed-tune mode).
#LBL (Labels on/off, GET/SET)
SET/RSP format: #LBLn; where n is 0 (FN key labels off) or 1 (FN key labels on).
#MFA, #MFB (Marker A/B Frequency, GET/SET)
SET/RSP format: #MFAsxxxxxxxxxxx; or #MFBsxxxxxxxxxxx; where s is +/- and xxxxxxxxxxx is
the marker frequency in Hz. s can also be a space in lieu of +. Example: #MFA+00014060000; sets the
marker A frequency to 14060 kHz. If the specified frequency is in a different band than the K3 is tuned
to, the actiion is undefined. A value of zero sets the marker to the main VFO frequency of the
transceiver. For transceivers other than the K3, the marker frequency is interpreted relative to the
frequency the transceiver is tuned to and may be positive or negative.
#MKA, MKB (Marker A/B on/off, GET/SET)
SET/RSP format: #MKAn; or #MKBn; where n is 0 (marker off) or 1 (marker on). The last marker to
be turned on automatically becomes the active marker, meaning it can be adjusted with the knob and is
the one that responds to the QSY command. If the marker was off-screen before executing a marker-on
command, it will default to the center frequency.
#PKM (Peak Mode on/off, GET/SET)
SET/RSP format: #PKMn; where n is 0 (peak mode off) or 1 (peak mode on).