Panasonic KX-T336 System Reference Manual page 642

Transmission Format
SOH ST-X
Address Area
The number of
Da.2 Area
bytes
I
I
I I
I I
I
1
I
I I
I
I I
Data Area
Ch;zm EXT ST-X
Address Area
I
I
I I I
SOH = Start of header
STX = Start of text
Address = System data address
(Is system address is "FFFFF h", it would
be software version) (ASCII code) - ..
The number of byte = 1 to 256 (ASCII code)
Data area = System data (ASCII code)
Checksum = Address + The number of bytes +
data
* The complement of the sum of all bytes (ASCII
code)
ETX = End of text
EOT = End of data transfer
16-B-5