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11.1 Notes for correct installation
•
To ensure correct operation of the ZigBee wireless system, the best possible
connection must be guaranteed between the Access Point and the Router.
•
The Router should preferably be installed at a height of around 2 to 3 m
from the fl oor, not in contact with large metallic objects (air ducting etc.), so
as to avoid the Router-Access Point connection being aff ected by obstacles
such as cabinets, showcases, moving people, and where possible in direct
line of sight with the other devices.
•
Make sure that the path between the Router and the Access Point does not
include metallic fi re doors or large metallic obstacles (elevator compartment
etc.) which may disturb the connection.
•
When positioning the devices, check that the sensors have at least two
wireless routes to the Access Point; that is, they can be seen by at least
two Routers or one Router and the Access Point, and that the wireless
signal levels, both in and out, are good. Remember that wireless devices
are signifi cantly aff ected by changing environmental conditions, unlike
wired connections, and therefore each sensor should be able to reach
the Access Point via at least two devices connected at the same wireless
network, which may be an Access Point and Router, or two Routers. It's also
recommended to set a delay on the supervisor (around 1 hour) for notifying
alarm signals, so as to avoid false sensor offl ine warnings;
•
Fasten the Access Point/Router in position, considering that as the device
being installed is a radio device, the following simple rules must be
observed:
•
The effi ciency of radio transmission is reduced when there are obstacles,
metal shelving or other objects that may block the reception of the wireless
signals;
•
If the product is wall-mounted, fasten it to a masonry wall rather than a
metal wall, to improve the range of the signal;
•
Like all radio equipment, avoid installing the Access Point near other
electronic appliances, so as to avoid interference;
•
Connect the RS485 network to the terminal respecting the polarity.
•
For correct operation the system must be powered at all times, in the event
of power failures there may be a unit reset time (OFFLINE) based on the data
transmission cycle;
•
Do not install the instruments in environments with the following
characteristics:
•
Strong vibrations or knocks;
•
Exposure to water sprays;
•
Exposure to direct sunlight or the elements in general;
If the devices are used in a way that is not described by the manufacturer, the
specifi ed level of protection may be aff ected.
11.2 Power supply connection
The 12-24 Vac/dc Access Point and Router can be powered using the CAREL
230/12 Vac 3 VA plug-in transformer code TRASP3E120, or electrical panel
transformer code TRADR4W012, or any other 12 Vac 2 VA transformer.
For 12/24 Vac/dc versions, the maximum wire size for the terminals is 1.5 mm2.
11. GENERAL NOTES
11.3 Wiring
To wire the serial connection to the Access Point or Router-Bridge local RS485
network, use 3-wire shielded cable. To ensure IP55 protection on the case, use
a 5-wire cable, and relay the serial and power supply connections through an
external junction box with terminal block.
The maximum wire size for the terminals is 1.5 mm2. The maximum outside
diameter of the cable must not exceed 8 mm, to allow it to pass through the
cable gland.
Features of the serial connection cable
For connection to the Access Point, the cable used must have the following
characteristics:
Twisted pair;
Shielded, preferably with earth wire;
Size AWG20 (diam. 0.7-0.8 mm; area 0.39-0.5 mm2);
Make sure that the cable shield is connected to EARTH on the supervisor
connection side, and that the polarity of the connection is observed on all
the units connected. The shield is normally connected to the reference on all
the units.
Also pay careful attention when connecting the local network to the Router-
Bridge, when using controllers connected in a local Modbus® RS485 network.
47
"Wireless probes" +0300030EN - rel. 1.0 - 16.07.2010
ENG
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