Functional Description
AP20S
Date: 24.08.2020
Art. No. 89992
Mod. status 133/20
Page 15 of 79
Alpha-numeric display:
Both lines are freely writable. The content of the display line can be transmitted via the
Display Data parameter, and the content of the display line can be transmitted via the Target
Value parameter. In this case, the bit for data identification must be set correctly in the
respective control word. The data identifier is used to distinguish whether the data is
interpreted and displayed as a number or as an alphanumeric character (ASCII)
and
Alternatively, you can write directly in each display line using the Display String parameter in
connection with the respective Display String1 or Display String2 (see chapter
and
LCD display:
If there is no valid target value, the 1st display line is displayed blank. "
----
" appears in
the 2nd display line.
A valid target value is displayed flashing until its receipt is acknowledged. If neither target
value has been acknowledged, both values are acknowledged jointly by pressing the key.
LED display:
Status LED1 and LED2:
With factory settings, the LED display (LED1, LED2) works according to the following table.
Operating state
State
Meaning
There is no valid target
value.
Both LEDs off
There is a valid target
value.
LED1 red
Display data not acknowledged
LED1 green
Display data acknowledged
LED2 red
Target value not acknowledged
LED2 green
Target value acknowledged
Table 5: Status LED display in the alpha-numeric display operating mode
3.1.5
Control word: Alpha-numeric display operating mode
In the control word, the relevant type (number or character string) and the validity of the
target value is transmitted to the display. As an additional option, the target value can be
acknowledged via the control word.
The control word is composed of 16 bits.
Control word
15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
MSB High Byte
Low Byte LSB
The designation of the individual bits of the control word as well as their meaning:
Bit Meaning
Value = 0
Value = 1
0
reserved
ever 0
-