GTM1 User manual V-2020-08-12
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Figure 39 SERA2> System Options> General System Options
-
Go to
SERA2> Automation/ Sensors
window.
The sensor will appear in the list automatically.
-
Double click on the selected sensor’s line
.
-
Set other parameters
of the sensor
MIN, MAX, alarm values etc.
-
Press
“Write”
in the command line
Please visit:
How to activate output, when defined value is reached?
How to test the system: hardware status & real time sensor values, event list.
How to read event log from internal memory of the module?
How to change temperature scale from Celsius to Fahrenheit
Using cat 5 cable is best and will make it easier to maintain a working 1-wire network when you expand and add more sensors. The data and
ground should use one twisted pair, for example blue/blue-white. A single wire from another pair is used for the 3.3 volt supply.
Don't double up wires on the assumption that this lowers resistance and is a 'good thing', it actually alters the impedance of the network and makes
it less reliable. All unused wires in the cat 5 cable should be left unconnected (don't connect them to ground).When running a 1-Wire bus, Dallas recommend
that you use an unshielded Cat5 cable for the bus. Do not use shielded cable as the capacitance increase will upset the network.
If you intend to have a large 1-Wire network, it is important that you design the network correctly, otherwise you will have problems with
timing/reflection issues and loss of data. You must connect each sensor to a single continuous cable which loops from sensor to sensor in turn (daisy
chain). This will reduce potential miss-reads due to reflections in the cable. Each sensor should have a maximum of 50mm (2") of cable connected off this
main network. Even when using this method, connecting more than 10-15 sensors will still cause problems due to loading of the data bus. To minimize
this effect, place a 100-
120Ω resistor in series in the data line of each sensor before connecting to the network. The total length of the bus from 10 to 100m.
Depending of cable quality sensors number on bus, and environment noise. There is possibility to connect up to 32 devices.
Figure 40 SERA2> Automation/ Sensors
