User's Manual

Page 10
M Series Data Radio – User Manual
© Copyright 2004 Trio DataCom Pty. Ltd.
Part C – Applications
Systems Architecture
Point-to-Point
This simple system architecture provides a virtual connection between
the two points, similar to a cable. Operation is half-duplex.
Point-to-Multipoint Systems
In a multiple access radio system, messages can be broadcast from
one (master) site to all others, either using a half duplex radio system
or from any site to all others, using a simplex radio channel.
Half duplex systems often utilise a full duplex master (EB or EH), to
make the system simpler and for faster operation.
In either case, it will be necessary for
the application to support an
addressing system, since the master
needs to be able to select which
remote device it wishes to
communicate with. The radio system
operates “transparently”, allowing the
application’s protocol to provide the
addressing, and thus control the traffic.