1
Selection of a message from the library
The signals D0 to D7 (which represent one byte of 8 bits) indicate the number of the active
message to be printed and its type of coding.
The number of addressable messages in the library is variable (from 1 to 79 in decimal format,
from 1 to 4F in hexadecimal format). It depends on the value displayed in the "SHIFT MENU"
function in the case of S4 or in the menu Production, Message, Library in the case of S4 plus.
Validation and printing of the new message are performed by sending the DTOP signal.
Possible types of encoding for the message number: there are 3 possibilities.
1.1
Encoding of message number in BCD format
The BCD mode (Binary Coded Decimal, base 10) uses 4 bits, whose value is comprised
between 0 and 9 (from 0000 to 1001 in binary code).
The units in the message number are represented by the bits 0, 1, 2 and 3.
The tens in the message number (from 0 to 7) are represented by the bits 4, 5 and 6.
Bit 7 must obligatorily be positioned at 1.
Example: request of message number 29.
6
5
4
3
2
1
0
Bit
Message number
9
1
0
1
0
0
1
1
0
2
"1" = active level
"0" = inactive level
"1" BCD mode
7
Parallel link - Selection of messages
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