PX 30 and PX 120 Operating Manual
3-9
From the 2nd cycle onwards, the variable value is transmitted from the higher value to
the lower value part. In the last cycle (in which the lowest value BCD-digits are
sent), a Logic 1 signal at E19 (e) signifies the end of variable transmission. When
more than 8 BCD-digits are to be transmitted (10 BCD-digits = maximum variable length),
variable values will need to be inserted in three cycles. In the 1st of these cycles, the 2
highest value BCD-digits will be ignored (see diagram on page 3-8).
Example: Inserting the value 21 750 912 for variable 7 in the message with text number
900.
7
Calling up text
23 15
0
1
0
Start and End, as only one cycle is required
0
1
0
0
0 0
0
0
0
0
0
0
1
1
0
0
0
0
0
Variable selection
23 15
0
1
7
0
0
1
0
0
0
1
1
0
1
0
1
Start of variable transmission
Inserting variables, 8-digit figure, high value part
23 15
0
7
0
0
1
0
0
0
0 1
1
0
0
0
1
0
1
1
1
1
0
0
0
Inserting variables, 8-digit figure, low value part
23 15
0
1
7
0
0
1
0
0
0
1
0
1
0
0
0 0
0
0
1
1
0
0
0
End of variable transmission
Variable Mode
ASCll-Coded Transmission
? = 1
Inserts "?"; flashes alternately with the lowest value digit of the
variable value
? = 0
"?" not inserted
_ = 1
Inserts "_"; flashes alternately with the lowest value digit of the
variable value
_ = 0
"_" not inserted
If ? = 1 and _ = 1, "?" will be inserted.
"?" or "_" can still be flashed at the point of the lowest value digit even when the variable
value is not transmitted (only in the 1st cycle, when E18 and E19 = 1).
N = 1
A negative prefix (-) is placed before the variable value
N = 0
Display without negative prefix
23 22 21 20 19 18 15
0
0
1
1
Variable Nos.
7
0
0
1 ? _ N
n n n
1
2
4
5
6
1st cycle
0 ... 7
23 22
21 20 19 18
15
23 22
21 20 19 18
15
23 22
21 20 19 18
15
23 22
21 20 19 18
15
23 22
21 20 19 18
15
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