S+S Regeltechnik AERASGARD AC02-Modbus Operating Instructions, Mounting & Installation page 15

G
®
HYGRASGARD
Display
standard
By default, the display indicates the following measurements with the
corresponding units cyclically and consecutively:
CO2 content in ppm, air quality (VOC) in %,
temperature in °C, relative humidity in % r.H.
Backlighting is provided for improved legibility.
The Modbus interface allows the display to be individually configured,
both in the 7 segment range and in the dot-matrix range.
Display - individually
programmable
Schematic diagram
Plug for
display
B
4
A
3
GND
2
1 U+
shield
AFTM- ⁄ KFTM - LQ - CO2 - Modbus
mode
ON
1 2 3 4 5 6
CO ² VOC
zero
DIP A: Bus address
DIP B: Bus parameters
Display
alternative output variables
The Modbus interface can be used to program an alternative output
variable instead of the standard display.
In this case, the first line indicates the value while the second line
indicates the corresponding unit statically.
The index in the third line indicates the display type:
Index 1 = CO2 content in ppm
Index 2 = air quality (VOC) in %
Index 3 = temperature in °C
Index 4 = relative humidity in % r.H.
Index 5 = atmospheric pressure in hPa
Plug for
display
B
4
A
3
GND
2
1 U+
shield
offset
CO ² VOC r.H. °C
address
DIP B DIP A
ON
1 2 3 4 5 6 7 8
B
4
A
3
GND
2
U+ 1
shield
15
CO ²
mode
ON DIP B ON
1 2 3 4 5 6 1 2 3 4 5 6 7 8
CO ² VOC
zero
DIP A: Bus address
DIP B: Bus parameters
(Baud rate, parity ...)
Telegram indicator
Reception (LED green)
Error (LED red)
Offset correction
LED (internal status)
Reset button
Rev. 2021 - V25
offset
VOC r.H. °C
address
DIP A
B
4
A
3
GND
2
U+ 1
shield