3
Introduction
Ovazone-Cell-Link-MTR-RS485-3G is a base station for 2.4 GHz and 433.92MHz Nokeval-transmitters
and part of Nokeval Ovazone product family. It receives and buffers radio packets to its non-volatile
memory and transmits them over GSM to Ovaport network service, thus enabling reliable remote data
acquisition from the field straight to the servers located in a data center.
Serial interface
The base station can be connected to standard Modbus RTU transmitters and to
Nokeval devices with
SCL protocol
using the integrated RS485 bus. The base station’s reliability is increased by theal backup
battery, which enables uninterrupted data acquisition also during external power interruptions.
Ovanet
Ovanet is Nokeval’s second generation radio network, which uses Wirepas Pino technology and
Nokeval’s own additions. The network uses 2.4-2.48 GHz band, which is available all over the world. The
product names basically begin with the Ovazone prefix.
Every device in the network, also battery powered ones, will function as a repeater by assisting devices
located far away from the gateway, effectively forming a mesh network.
The network has node devices producing measurement data, and one or more gateways. The gateway
connects the network to other systems. Examples of the gateway devices are Ovazone-Wave-Link and
Ovazone-Cell-Link. They are used to deliver the data of the radio network to the Ovaport service.
Each device, including nodes and gateways, has to be set with the same Ovanet network. The Ovanet
network number has to be chosen between 1-16777214. It should be generated with a random number
generator, to minimize the probability to accidentally choose the same network number as in another
network located nearby. By default, the devices are set to the network number 6829663, which can be
used if there are no other Ovanet or Wirepas Pino networks within a couple of hundred meters. If two
networks have the same number by accident, the node devices may connect to a wrong network and
the data is not delivered to the desired gateway.
Each device has a unique Ovanet address. It is set at the factory and there is no need to change it. The
address is visible in the back label of the device.
The devices automatically change their radio frequency seeking suitable frequencies in the crowded 2.4
GHz band. However, at power-up the devices need to find other devices in the network, for which a
common radio frequency is needed. All the devices of the network need to be set to the same radio
channel between 1-28. Usually the default channel 1 is ok.
There is no need to configure any other radio network settings. The network searches automatically for
the best connections and updates them if needed.
The open space range between the nodes is about 200 meters and indoor range is some tens of meters
depending on the construction materials. Placing the devices near a metal surface will decrease the
range.
