Code Line Select Key; Transponder Code Storage (Sto) Button - Honeywell PRIMUS 1000 Pilot's Manual

The line select key opposite the ATC legend places the cursor over the
transponder code to be changed. The large outer tuning knob controls
the left two digits; the smaller inner knob controls the two right digits.
Line Select Keys -- The first push of a line select key moves the
D
yellow cursor to surround the data line associated with that line
select key. This electronically connects that data field to the TUNE
knobs so that the ATC/TCAS mode or transponder code can be
changed.
Code Line Select Key -- Push this key to place a cursor around the
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four--digit transponder code. The code can be changed using the
large outer TUNE knob to control the left two digits, and the smaller
inner TUNE knob to control the right two digits. The code line select
key can also be used to retrieve a transponder code that has been
stored in memory.
Transponder Code Storage (STO) Button -- A selected
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transponder code can be stored in memory by pushing the STO
button while the cursor is on the transponder code. To retrieve the
code from memory, push and hold the code line select key for three
seconds.
A28--1146--112--00
PRIMUSr1000 Integrated Avionics System
RMU ATC/TCAS Controls
Figure C--13
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PRIMUS II Radio System
C--21