General Features Of The System; Using The Router; General Notes - Carel BP SE Sensor User Manual

Example of a Mesh network
The MESH layout, used in the wireless sensor system for refrigeration between
coordinator nodes (access points) and router-bridge devices, ensures a high
tolerance to faults, as if one sensor loses wireless communication, the radio
signal still manages to fi nd an alternative route to reach the destination.
R
R
Fig. 1.d

1.6 General features of the system

Maximum distance between Access Point/Router and Sensors in open fi eld
(outdoors): 100 m.
Maximum distance between Access Point/Router and Sensors with fi eld of
sight (indoors): around 30 m (inside rooms and built-up areas).
Transmission frequency: selectable from 2405 to 2480 MHz.
Number of channels available: 16.
Transmission power:
•
Access Point 0 dBm
•
Router 230Vac +10 dBm
•
Router Bridge 0 dBm
•
EP1 Router-Sensor +10 dBm
•
RA Router-Actuator +3 dBm
•
Router-Pulse Counter +10 dBm
•
BP SE Sensor +3 dBm
•
EP SE Sensor +3 dBm
•
SA Room Sensor +3 dBm
•
SI Industrial Sensor +3 dBm
•
CI Pulse Counter +3 dBm
Wireless protocol: ZigBee™ without interoperability.
Standard: 802.15.4.
Reception sensitivity:
•
Access Point -92 dBm
•
Router SE 230Vac -97 dBm
•
Router Bridge -92 dBm
•
Router EP probe1 -97 dBm
•
RA Router-Actuator -95 dBm
•
Router-Pulse Counter -97 dBm
•
BP SE Sensor -95 dBm
•
EP SE Sensor -95 dBm
•
SA Room Sensor -95 dBm
•
SI Industrial Sensor -95 dBm
•
CI Pulse Counter -95 dBm
R
AP
RS 485 ModBus
For battery powered devices:
•
Maximum current for battery powered devices only: 35 mA, in transmission.
•
Current in standby: 1 μA.
Maximum HOP levels: 7 (hops).
Maximum number of wireless network devices:
•
30 for each Access Point (with 1 Router up to 60 units);
•
16 Routers directly connectable to the Access Point up to a maximum of 60
devices on the same network;
•
16 Router directly connectable to each Router up to a maximum of 60
devices on the same network;
Maximum number devices on Modbus® RS485 network:
•
7 Access Point;
•
111 Sensors;
•
60 Routers, max 48 of which monitored by the supervisor;
•
On Modbus network in combination with other devices up to max 247
units.
1 2
R R
Access point

1.7 Using the Router

When does the Router need to be installed?
The Router is required whenever a direct connection is not possible between
the Access Point and the Sensor; this may occur when:
•
The distance between Access Point and Sensor is greater than 30 m MAX
with visibility between the instruments.
•
There is no visibility between the Access Point and the Sensor, and/or
there is shielding infrastructure that reduces the wireless communication
distance.
•
In addition, the Router is required if the number of Sensors managed
exceeds 30 devices.
In addition, this is used to improve the reliability of the wireless connection,
the Router network can in fact fi nd an alternative path if one of the direct
connections between the sensors and the access point fails.
Recommended:
Up to 15 sensors 1 Router;
from 16 to 30 sensors 2 Routers;
from 31 to 45 sensors 3 Routers;
from 46 to 60 sensors 4 Routers.

1.8 General notes

The radio range of the devices is around a hundred metres in an open fi eld,
that is, without any obstacles.
In a closed fi eld the range varies signifi cantly based on the type of environment
and the surrounding objects (shelves, furniture, metal walls etc.).
Thick partition walls or reinforced ceilings and fl oors may represent impassable
obstacles.
The ideal position of the devices, especially the routers, often cannot be
defi ned theoretically but must be found by trial and error in the actual
installation.
Serial address assignment is valid for all devices
Make sure not to assign the same serial address ID to two devices in the same
wireless network.
11 "Wireless probes" +0300030EN - rel. 1.0 - 16.07.2010
Router-Bridge
3 4 5 6 7
R R R
R R
Max 60 sensors
Fig. 1.e
ENG