Panasonic KX-T336 System Reference Manual page 147

3.00 RS-232C Interface
The KX-T336 System provides two RS-232C interfaces.
These interfaces provide communication between the system and customer supplied
devices such as data terminals and line printers.
RS-232C Port 1 (PROG) is used for system programming, diagnostics and external
system database storage (Save/Load) functions, and Port 2 (SMDR) for Station
Message Detailed Recording (SMDR) only.
PROG
SMDR
2-D-3