C - Lublin

connecting smart-transducers into a easily accessible network, with the special
focus on the connection to the network in the wireless way.
DESIGN OF THE WIRELESS COMMUNICATION SYSTEM
The application of wireless transmission in the license-free frequency bands for
communication in short distances is very popular in environmental monitoring
systems as well as in the control of industrial processes. Very attractive are
frequency ranges 433 MHz and 868 MHz called ISM (Industrial, Scientific and
Medical) frequency bands. There are many electronic devices available dedicated
for ISM bands, particularly modern trainceivers integrating radio receivers and
transmitters in the same integrated circuits [3,4]. The ready to apply radio modules
are available for electronic engineers in the form of mounted and tested tiny
electronic boards for the price of only about 10 Euro. The hardware and software
of the radio communication systems should be designed with the following criteria
in mind: (i) minimize the transmission errors, (ii) maximize the radio link range,
(iii) minimize the current consumption (the systems are usually battery operated).
The presented prototype system allows to control the measurement process and
transmission of the soil profile temperature. The software communication protocol
as well as MASTER and SLAVE hardware devices carried out the point-to-point
radio link. The communication protocol can be enhanced to point-multipoint
connection for radio network system.
The functional diagram of the prototype communication system, serving as an
implementation IEEE1451 standard NCAP – Network Capable Application
Processor, is presented in Fig. 1.
Fig. 1. Functional diagram of the prototype soil physical parameters
monitoring system with the wireless communication link
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