1.4
Sending of the security code
This code protects the V24 messages. It can be initialised, therefore modified but not visualised.
The calculator should recognise the preceding code in order to send other sequences of
instructions.
CALCULATOR
PRINTER
The security code is a sequence of 3 ASCII characters (alphanumerical) comprised between 20h
and 60h inclusive.
Transmission of NACK, SP corresponds to an incorrect security code.
NOTE
The security code, if it was transmitted to the printer at the end of
the previous utilisation, must be sent in the first sequence of each
exchange.
REMINDER
After a reset of the memory of the CPU board, the printer
automatically sets the security code to "TWO".
Length
00h, 03h
Identification
3Fh
Control byte
xxh
Code 2 (1 ASCII)
xxh
Code 3 (1 ASCII)
xxh
Code 1 (1 ASCII)
xxh
NACK
ACK
15h
06h
or
Protocol
A13862 Version E
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