GTalarm3 User manual V-2022-05-24
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7.
Real time hardware status: RT Testing & Monitoring> Hardware. Press “Start Monitoring”
8. The list of alarm events with time and date stamp: RT Testing & Monitoring> Event Monitoring
9. It is possible to receive alarm SMS to the mobile phone: GSM Communication> SMS/ Dial reporting
10. Real time sensor values and states: RT Testing & Monitoring> Sensors/ Automation.
11. Write configuration. Press write.
3.3.3
Temperature sensors Dallas 1-wire DS18b20 installation & recommendations
The DS18B20 digital thermometer provides 12-bit Celsius
temperature measurements. The DS18B20 communicates
over a 1-Wire
Each DS18B20 has a unique 64-bit
serial code, which allows multiple DS18B20s to
function on the same 1-Wire bus.
Thus, it is simple
to use one to control many DS18B20s distributed over a
large area. Applications that can benefit from this feature
include
HVAC
environmental
controls,
temperature
monitoring systems inside buildings, equipment, or
machinery, and process monitoring and control systems.
Applications/Uses
Consumer Products
Industrial Systems
Thermally Sensitive Systems
Thermometers
Thermostatic Controls
Key Features
Measures Temperatures from -
55°C to +125°C
(-
67°F to +257°F)
±0.5°C Accuracy from -10°C to +85°C
Each Device Has a Unique 64-Bit code.
3.3.3.1
Wiring Dallas 1-wire DS18b20
1.
Connect 1-Wire sensors DS18b20 to D1, D2, D3 according connection diagram.
D3
+5V
D1
D2
COM
data
com
+3.3V
1
2
3
470µF...4700µF
1 wire D1...D3
Temperature sensor
DS18b20
G
T
al
a
rm
3
Figure 12 DS18b20 connection with long distance UTP or FTP cable
2.
If you need to connect more sensors to the same input, connect them as a star or serial. Each line should be separate by 82-120 Ohm resistor
82-120 Ohm
max 100m line
Sensor1 DS18b20
Sensor2 DS18b20
Sensor3 DS18b20
82-120 Ohm
82-120 Ohm
max 100m line
max 100m line
I/
O
3
C
O
M
O
U
T4
O
U
T3
I/
O
1
IN
4
IN
3
IN
2
D
3
O
U
T1
+5
V
O
U
T2
D
1
D
2
VD
+
C
O
M
IN
1
I/
O
2
GTalarm3
Figure 13 Star connection
The resistor must be as close as possible to the contacts of the module GTalarm3.
