Panasonic KX-TD500 System Reference Manual page 145

3.00 RS-232C Interface
The KX-TD500 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
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L SU
DI GI TA
2-D-3