HW Group STE 2, Руководство пользователя

Страница: 33 / 44

STE2 33
Supported interfaces
Active / Passive 1-Wire port
• Active port: RJ11 connector on the device. It guarantees full
maximum distance of the sensors and power supply for
all sensors.
When you reconnected the connected sensor from one active
port to another, the sensor shows up as disconnected. You
must restart automatic sensor detection.
• Passive port: RJ11 connector on the T-Hub router or RJ11
connector from the sensor (if sensors are chained).
Sensor Hysteresis
The Hysteresis value defines the width of the tolerance range for sending an alarm. The function
prevents the occurrence of multiple alarms in cases when the value oscillates around the defined
value. The function is apparent from the graph.
Within the internal 5°C hysteresis band, the alarm would be activated in point 8 and would end in
point 9
. Because of the hysteresis function, the alarm is extended until the temperature reaches
the end of the hysteresis zone (point 10) 5 °C + (-15 °C) = -10 °C.
• Hysteresis (=5 °C): The unit sends 3 e-mails ( SMS )
Alarm at points
0..4
,
8..10
,
12
and upwards.
• Without hysteresis (0 °C): The unit sends 8 e-mails ( SMS )
Alarm at points
0..1
,
2..3
,
8..9
,
12..13
,
14
and upwards.
RJ11
1 - Not used
2 Data Transmit Data
3 GND Ground
4 +5V Power
1 2 3 4
Hysteresis
Hysteresis
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Legend
Temperature range: -15 .. +25 °C
Hysteresis: 5 °C
Alarm ON
Alarm OFF
25
T[°C]
t[s]
20
15
10
5
0
0
-5
-10
-15
-20
-25
Alarm
state
Hysteresis = 5 °C
None Hysteresis